{"id":38060,"date":"2026-01-19T13:46:12","date_gmt":"2026-01-19T06:46:12","guid":{"rendered":"https:\/\/interdata.vn\/blog\/?p=38060"},"modified":"2026-01-19T13:46:12","modified_gmt":"2026-01-19T06:46:12","slug":"swap-memory-la-gi","status":"publish","type":"post","link":"https:\/\/interdata.vn\/blog\/swap-memory-la-gi\/","title":{"rendered":"Swap Memory L\u00e0 G\u00ec? So V\u1edbi RAM, L\u1ee3i \u00cdch &#038; C\u00e1ch T\u1ea1o Swap 2026"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-white ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">N\u1ed8I DUNG<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/interdata.vn\/blog\/swap-memory-la-gi\/#Swap-Memory-la-gi\" >Swap Memory l\u00e0 g\u00ec?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/interdata.vn\/blog\/swap-memory-la-gi\/#Swap-Memory-khac-RAM-nhu-the-nao\" >Swap Memory kh\u00e1c RAM nh\u01b0 th\u1ebf n\u00e0o?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/interdata.vn\/blog\/swap-memory-la-gi\/#Vi-sao-Swap-cham-hon-RAM\" >V\u00ec sao Swap ch\u1eadm h\u01a1n RAM?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/interdata.vn\/blog\/swap-memory-la-gi\/#Loi-ich-khi-su-dung-Swap-Memory\" >L\u1ee3i \u00edch khi s\u1eed d\u1ee5ng Swap Memory<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/interdata.vn\/blog\/swap-memory-la-gi\/#Uu-va-nhuoc-diem-khi-su-dung-Swap\" >\u01afu v\u00e0 nh\u01b0\u1ee3c \u0111i\u1ec3m khi s\u1eed d\u1ee5ng Swap<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/interdata.vn\/blog\/swap-memory-la-gi\/#Uu-diem\" >\u01afu \u0111i\u1ec3m<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/interdata.vn\/blog\/swap-memory-la-gi\/#Nhuoc-diem-%E2%80%93-Van-de-can-luu-y\" >Nh\u01b0\u1ee3c \u0111i\u1ec3m &#8211; V\u1ea5n \u0111\u1ec1 c\u1ea7n l\u01b0u \u00fd<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/interdata.vn\/blog\/swap-memory-la-gi\/#Co-nen-dung-Swap-Memory-khong\" >C\u00f3 n\u00ean d\u00f9ng Swap Memory kh\u00f4ng?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/interdata.vn\/blog\/swap-memory-la-gi\/#Truong-hop-NEN-dung-Swap\" >Tr\u01b0\u1eddng h\u1ee3p N\u00caN d\u00f9ng Swap<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/interdata.vn\/blog\/swap-memory-la-gi\/#Truong-hop-KHONG-NEN-lam-dung-Swap\" >Tr\u01b0\u1eddng h\u1ee3p KH\u00d4NG N\u00caN l\u1ea1m d\u1ee5ng Swap<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/interdata.vn\/blog\/swap-memory-la-gi\/#Nen-thiet-lap-dung-luong-Swap-bao-nhieu-la-phu-hop\" >N\u00ean thi\u1ebft l\u1eadp dung l\u01b0\u1ee3ng Swap bao nhi\u00eau l\u00e0 ph\u00f9 h\u1ee3p?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/interdata.vn\/blog\/swap-memory-la-gi\/#Tan-suat-Swap-bao-nhieu-la-hop-li\" >T\u1ea7n su\u1ea5t Swap bao nhi\u00eau l\u00e0 h\u1ee3p l\u00ed?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/interdata.vn\/blog\/swap-memory-la-gi\/#Swap-Memory-co-lam-cham-VPS-Khong\" >Swap Memory c\u00f3 l\u00e0m ch\u1eadm VPS Kh\u00f4ng?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/interdata.vn\/blog\/swap-memory-la-gi\/#2-hinh-thuc-Swap-Memory-pho-bien\" >2 h\u00ecnh th\u1ee9c Swap Memory ph\u1ed5 bi\u1ebfn<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/interdata.vn\/blog\/swap-memory-la-gi\/#Swap-Partition\" >Swap Partition<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/interdata.vn\/blog\/swap-memory-la-gi\/#Swap-File\" >Swap File<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/interdata.vn\/blog\/swap-memory-la-gi\/#So-sanh-2-hinh-thuc\" >So s\u00e1nh 2 h\u00ecnh th\u1ee9c<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/interdata.vn\/blog\/swap-memory-la-gi\/#Cach-tao-Swap-Memory-tren-Ubuntu-CentOS-Linux\" >C\u00e1ch t\u1ea1o Swap Memory tr\u00ean Ubuntu &amp; CentOS Linux<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/interdata.vn\/blog\/swap-memory-la-gi\/#Nhung-luu-y-quan-trong-khi-su-dung-Swap-Memory\" >Nh\u1eefng l\u01b0u \u00fd quan tr\u1ecdng khi s\u1eed d\u1ee5ng Swap Memory<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/interdata.vn\/blog\/swap-memory-la-gi\/#Cau-hoi-thuong-gap-FAQs\" >C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p (FAQs)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/interdata.vn\/blog\/swap-memory-la-gi\/#Ket-luan\" >K\u1ebft lu\u1eadn<\/a><\/li><\/ul><\/nav><\/div>\n<p>Trong qu\u00e1 tr\u00ecnh v\u1eadn h\u00e0nh m\u00e1y ch\u1ee7 \u1ea3o (<a href=\"https:\/\/interdata.vn\/blog\/vps-la-gi\/\">VPS<\/a>) ho\u1eb7c m\u00e1y ch\u1ee7 ri\u00eang (Dedicated Server), m\u1ed9t trong nh\u1eefng v\u1ea5n \u0111\u1ec1 k\u1ef9 thu\u1eadt ph\u1ed5 bi\u1ebfn nh\u1ea5t m\u00e0 qu\u1ea3n tr\u1ecb vi\u00ean g\u1eb7p ph\u1ea3i l\u00e0 t\u00ecnh tr\u1ea1ng \u0111\u1ea7y b\u1ed9 nh\u1edb <a href=\"https:\/\/interdata.vn\/blog\/ram-server\/\">RAM<\/a> (Full RAM). Khi t\u00e0i nguy\u00ean RAM v\u1eadt l\u00fd b\u1ecb c\u1ea1n ki\u1ec7t, h\u1ec7 th\u1ed1ng s\u1ebd tr\u1edf n\u00ean ch\u1eadm ch\u1ea1p, c\u00e1c t\u00e1c v\u1ee5 x\u1eed l\u00fd b\u1ecb \u0111\u00ecnh tr\u1ec7, th\u1eadm ch\u00ed d\u1eabn \u0111\u1ebfn vi\u1ec7c c\u00e1c d\u1ecbch v\u1ee5 quan tr\u1ecdng nh\u01b0 Web Server (Nginx\/Apache) hay Database (MySQL\/MariaDB) b\u1ecb h\u1ec7 \u0111i\u1ec1u h\u00e0nh bu\u1ed9c d\u1eebng ho\u1ea1t \u0111\u1ed9ng \u0111\u1ec3 gi\u1ea3i ph\u00f3ng t\u00e0i nguy\u00ean.<\/p>\n<p>\u0110\u1ed1i v\u1edbi c\u00e1c VPS c\u00f3 c\u1ea5u h\u00ecnh khi\u00eam t\u1ed1n (RAM t\u1eeb 1GB \u0111\u1ebfn 4GB), <strong>Swap memory<\/strong> th\u01b0\u1eddng \u0111\u01b0\u1ee3c nh\u1eafc \u0111\u1ebfn nh\u01b0 m\u1ed9t gi\u1ea3i ph\u00e1p c\u1ee9u c\u00e1nh t\u1ea1m th\u1eddi v\u00e0 hi\u1ec7u qu\u1ea3. Tuy nhi\u00ean, nhi\u1ec1u ng\u01b0\u1eddi d\u00f9ng m\u1edbi v\u1eabn ch\u1ec9 \u0111\u01a1n thu\u1ea7n k\u00edch ho\u1ea1t Swap theo c\u00e1c b\u00e0i h\u01b0\u1edbng d\u1eabn tr\u00ean m\u1ea1ng m\u00e0 ch\u01b0a th\u1ef1c s\u1ef1 hi\u1ec3u b\u1ea3n ch\u1ea5t k\u1ef9 thu\u1eadt b\u00ean trong. Vi\u1ec7c c\u1ea5u h\u00ecnh sai dung l\u01b0\u1ee3ng ho\u1eb7c kh\u00f4ng hi\u1ec3u r\u00f5 c\u01a1 ch\u1ebf v\u1eadn h\u00e0nh c\u1ee7a Swap c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn t\u00e1c d\u1ee5ng ng\u01b0\u1ee3c, l\u00e0m h\u1ec7 th\u1ed1ng ch\u1eadm h\u01a1n ho\u1eb7c gi\u1ea3m tu\u1ed5i th\u1ecd \u1ed5 c\u1ee9ng SSD.<\/p>\n<p>B\u00e0i vi\u1ebft n\u00e0y s\u1ebd cung c\u1ea5p m\u1ed9t g\u00f3c nh\u00ecn to\u00e0n di\u1ec7n v\u1ec1 Swap Memory l\u00e0 g\u00ec t\u1eeb kh\u00e1i ni\u1ec7m c\u01a1 b\u1ea3n, so s\u00e1nh hi\u1ec7u n\u0103ng, c\u00e1c tr\u01b0\u1eddng h\u1ee3p n\u00ean d\u00f9ng v\u00e0 kh\u00f4ng n\u00ean d\u00f9ng, cho \u0111\u1ebfn c\u00e1c k\u1ef9 thu\u1eadt t\u1ed1i \u01b0u n\u00e2ng cao RAM \u1ea3o gi\u00fap b\u1ea1n l\u00e0m ch\u1ee7 ho\u00e0n to\u00e0n vi\u1ec7c qu\u1ea3n l\u00fd b\u1ed9 nh\u1edb tr\u00ean h\u1ec7 th\u1ed1ng Linux.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Swap-Memory-la-gi\"><\/span>Swap Memory l\u00e0 g\u00ec?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><a href=\"https:\/\/interdata.vn\/blog\/swap-memory-la-gi\/\"><strong>Swap Memory<\/strong><\/a> (hay c\u00f2n g\u1ecdi l\u00e0\u00a0b\u1ed9 nh\u1edb \u1ea3o Linux, kh\u00f4ng gian ho\u00e1n \u0111\u1ed5i) l\u00e0 m\u1ed9t ph\u1ea7n dung l\u01b0\u1ee3ng l\u01b0u tr\u1eef tr\u00ean \u1ed5 c\u1ee9ng (Hard Disk Drive &#8211; HDD ho\u1eb7c Solid State Drive &#8211; SSD) \u0111\u01b0\u1ee3c h\u1ec7 \u0111i\u1ec1u h\u00e0nh s\u1eed d\u1ee5ng \u0111\u1ec3 m\u1edf r\u1ed9ng b\u1ed9 nh\u1edb kh\u1ea3 d\u1ee5ng cho h\u1ec7 th\u1ed1ng. Khi b\u1ed9 nh\u1edb truy c\u1eadp ng\u1eabu nhi\u00ean (RAM) v\u1eadt l\u00fd b\u1ecb \u0111\u1ea7y, h\u1ec7 \u0111i\u1ec1u h\u00e0nh s\u1ebd t\u00ecm ki\u1ebfm c\u00e1c d\u1eef li\u1ec7u kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng (inactive data) trong RAM v\u00e0 di chuy\u1ec3n ch\u00fang sang v\u00f9ng kh\u00f4ng gian Swap n\u00e0y.<\/p>\n<p>H\u00e0nh \u0111\u1ed9ng n\u00e0y gi\u00fap gi\u1ea3i ph\u00f3ng RAM v\u1eadt l\u00fd \u0111\u1ec3 h\u1ec7 th\u1ed1ng c\u00f3 th\u1ec3 ti\u1ebfp t\u1ee5c ch\u1ea1y c\u00e1c \u1ee9ng d\u1ee5ng m\u1edbi ho\u1eb7c x\u1eed l\u00fd c\u00e1c t\u00e1c v\u1ee5 \u01b0u ti\u00ean cao h\u01a1n m\u00e0 kh\u00f4ng b\u1ecb treo do thi\u1ebfu b\u1ed9 nh\u1edb.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-38071\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Swap-Memory-la-gi.jpg\" alt=\"Swap Memory l\u00e0 g\u00ec\" width=\"800\" height=\"500\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Swap-Memory-la-gi.jpg 800w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Swap-Memory-la-gi-300x188.jpg 300w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Swap-Memory-la-gi-768x480.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/p>\n<p>\u0110\u1ec3 tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi\u00a0Swap memory l\u00e0 g\u00ec\u00a0m\u1ed9t c\u00e1ch d\u1ec5 hi\u1ec3u nh\u1ea5t, h\u00e3y t\u01b0\u1edfng t\u01b0\u1ee3ng RAM v\u1eadt l\u00fd l\u00e0 m\u1eb7t b\u00e0n l\u00e0m vi\u1ec7c c\u1ee7a b\u1ea1n, n\u01a1i b\u1ea1n x\u1eed l\u00fd c\u00e1c t\u00e0i li\u1ec7u \u0111ang m\u1edf. Khi m\u1eb7t b\u00e0n \u0111\u00e3 k\u00edn ch\u1ed7 v\u00e0 b\u1ea1n c\u1ea7n m\u1edf th\u00eam t\u00e0i li\u1ec7u m\u1edbi, b\u1ea1n bu\u1ed9c ph\u1ea3i c\u1ea5t b\u1edbt nh\u1eefng t\u00e0i li\u1ec7u \u00edt d\u00f9ng v\u00e0o ng\u0103n k\u00e9o \u0111\u1ec3 l\u1ea5y ch\u1ed7 tr\u1ed1ng. Trong h\u1ec7 th\u1ed1ng m\u00e1y t\u00ednh, &#8220;ng\u0103n k\u00e9o&#8221; \u0111\u00f3 ch\u00ednh l\u00e0 Swap.<\/p>\n<p><strong>\u1ee8ng d\u1ee5ng th\u1ef1c t\u1ebf c\u1ee7a Swap r\u1ea5t \u0111a d\u1ea1ng, t\u00f9y thu\u1ed9c v\u00e0o \u0111\u1ed1i t\u01b0\u1ee3ng s\u1eed d\u1ee5ng:<\/strong><\/p>\n<p><strong>Swap cho VPS gi\u00e1 r\u1ebb<\/strong><\/p>\n<p>Ng\u01b0\u1eddi d\u00f9ng sinh vi\u00ean, c\u00e1 nh\u00e2n ch\u1ea1y c\u00e1c g\u00f3i VPS 512MB &#8211; 1GB RAM \u0111\u1ec3 h\u1ecdc t\u1eadp ho\u1eb7c l\u00e0m web v\u1ec7 tinh. Nh\u00f3m n\u00e0y b\u1eaft bu\u1ed9c ph\u1ea3i t\u1ea1o <strong>swap cho vps<\/strong> \u0111\u1ec3 c\u00e0i \u0111\u1eb7t \u0111\u01b0\u1ee3c c\u00e1c Control Panel nh\u01b0 CyberPanel, aPanel (v\u1ed1n y\u00eau c\u1ea7u RAM t\u1ed1i thi\u1ec3u nh\u1ea5t \u0111\u1ecbnh m\u1edbi cho c\u00e0i \u0111\u1eb7t).<\/p>\n<p><strong>Swap Memory cho WordPress<\/strong><\/p>\n<p>M\u00e3 ngu\u1ed3n WordPress, \u0111\u1eb7c bi\u1ec7t l\u00e0 khi c\u00e0i nhi\u1ec1u Plugin ho\u1eb7c d\u00f9ng Page Builder (Elementor, Divi), ti\u00eau t\u1ed1n kh\u00e1 nhi\u1ec1u RAM. <strong>Swap memory cho wordpress<\/strong> gi\u00fap x\u1eed l\u00fd c\u00e1c t\u00e1c v\u1ee5 bi\u00ean t\u1eadp b\u00e0i vi\u1ebft, c\u1eadp nh\u1eadt plugin m\u00e0 kh\u00f4ng g\u1eb7p l\u1ed7i &#8220;500 Internal Server Error&#8221; do thi\u1ebfu b\u1ed9 nh\u1edb.<\/p>\n<p><strong>Swap cho SEO Tool \/ Automation<\/strong><\/p>\n<p>C\u00e1c c\u00f4ng c\u1ee5 c\u00e0o d\u1eef li\u1ec7u (crawling), tool SEO ch\u1ea1y tr\u00ean <a href=\"https:\/\/interdata.vn\/blog\/vps-windows-la-gi\/\">VPS Windows<\/a> ho\u1eb7c Linux th\u01b0\u1eddng ti\u00eau t\u1ed1n t\u00e0i nguy\u00ean trong th\u1eddi gian d\u00e0i. <strong>Swap cho seo tool<\/strong> gi\u00fap duy tr\u00ec s\u1ef1 \u1ed5n \u0111\u1ecbnh cho c\u00e1c t\u00e1c v\u1ee5 treo m\u00e1y 24\/7 n\u00e0y.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Swap-Memory-khac-RAM-nhu-the-nao\"><\/span>Swap Memory kh\u00e1c RAM nh\u01b0 th\u1ebf n\u00e0o?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>M\u1eb7c d\u00f9 Swap v\u00e0 RAM \u0111\u1ec1u \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 l\u01b0u tr\u1eef d\u1eef li\u1ec7u t\u1ea1m th\u1eddi cho c\u00e1c ti\u1ebfn tr\u00ecnh \u0111ang ch\u1ea1y, nh\u01b0ng b\u1ea3n ch\u1ea5t v\u1eadt l\u00fd v\u00e0 hi\u1ec7u n\u0103ng c\u1ee7a ch\u00fang ho\u00e0n to\u00e0n kh\u00e1c bi\u1ec7t. Hi\u1ec3u r\u00f5 gi\u1eefa <strong>swap v\u00e0 ram kh\u00e1c nhau\u00a0\u1edf \u0111i\u1ec3m n\u00e0o<\/strong> s\u1ebd gi\u00fap b\u1ea1n c\u00f3 k\u1ef3 v\u1ecdng \u0111\u00fang \u0111\u1eafn v\u1ec1 hi\u1ec7u su\u1ea5t h\u1ec7 th\u1ed1ng.<\/p>\n<p>B\u1ea3ng so s\u00e1nh Swap vs RAM:<\/p>\n<p>\u0110\u1ec3 h\u00ecnh dung r\u00f5 h\u01a1n, ch\u00fang ta h\u00e3y xem b\u1ea3ng so s\u00e1nh d\u01b0\u1edbi \u0111\u00e2y:<\/p>\n<table style=\"width: 100%; border-collapse: collapse; font-family: Arial, Helvetica, sans-serif; font-size: 15px; line-height: 1.6; box-shadow: 0 4px 12px rgba(0,0,0,0.08); border-radius: 10px; overflow: hidden;\">\n<thead>\n<tr style=\"background: linear-gradient(90deg, #0C40F4, #077FFA, #0497FC); color: #ffffff;\">\n<th style=\"padding: 14px 12px; text-align: left; width: 25%;\">\u0110\u1eb7c \u0111i\u1ec3m<\/th>\n<th style=\"padding: 14px 12px; text-align: left; width: 37.5%;\">RAM (Random Access Memory)<\/th>\n<th style=\"padding: 14px 12px; text-align: left; width: 37.5%;\">Swap Memory (Virtual Memory)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"background-color: #ffffff;\">\n<td style=\"padding: 12px; font-weight: 600;\">V\u1ecb tr\u00ed l\u01b0u tr\u1eef<\/td>\n<td style=\"padding: 12px;\">Chip nh\u1edb b\u00e1n d\u1eabn g\u1eafn tr\u1ef1c ti\u1ebfp tr\u00ean Mainboard<\/td>\n<td style=\"padding: 12px;\">\u1ed4 c\u1ee9ng l\u01b0u tr\u1eef (HDD ho\u1eb7c SSD)<\/td>\n<\/tr>\n<tr style=\"background-color: #f4f7ff;\">\n<td style=\"padding: 12px; font-weight: 600;\">T\u1ed1c \u0111\u1ed9 truy xu\u1ea5t<\/td>\n<td style=\"padding: 12px;\">C\u1ef1c nhanh (t\u00ednh b\u1eb1ng <strong>Nanoseconds \u2013 ns<\/strong>)<\/td>\n<td style=\"padding: 12px;\">Ch\u1eadm h\u01a1n RAM r\u1ea5t nhi\u1ec1u (t\u00ednh b\u1eb1ng <strong>Milliseconds ho\u1eb7c Microseconds<\/strong>)<\/td>\n<\/tr>\n<tr style=\"background-color: #ffffff;\">\n<td style=\"padding: 12px; font-weight: 600;\">B\u1ea3n ch\u1ea5t<\/td>\n<td style=\"padding: 12px;\">B\u1ed9 nh\u1edb kh\u1ea3 bi\u1ebfn (m\u1ea5t d\u1eef li\u1ec7u khi t\u1eaft ngu\u1ed3n)<\/td>\n<td style=\"padding: 12px;\">B\u1ed9 nh\u1edb b\u1ea5t bi\u1ebfn (d\u1eef li\u1ec7u n\u1eb1m tr\u00ean \u1ed5 c\u1ee9ng, kh\u00f4ng d\u00f9ng l\u1ea1i n\u1ebfu kh\u00f4ng n\u1ea1p)<\/td>\n<\/tr>\n<tr style=\"background-color: #f4f7ff;\">\n<td style=\"padding: 12px; font-weight: 600;\">M\u1ee5c \u0111\u00edch ch\u00ednh<\/td>\n<td style=\"padding: 12px;\">X\u1eed l\u00fd d\u1eef li\u1ec7u th\u1eddi gian th\u1ef1c cho CPU<\/td>\n<td style=\"padding: 12px;\">L\u01b0u tr\u1eef d\u1eef li\u1ec7u t\u1ea1m th\u1eddi \u00edt d\u00f9ng, d\u1ef1 ph\u00f2ng khi h\u1ebft RAM<\/td>\n<\/tr>\n<tr style=\"background-color: #ffffff;\">\n<td style=\"padding: 12px; font-weight: 600;\">Chi ph\u00ed\/GB<\/td>\n<td style=\"padding: 12px;\">Cao<\/td>\n<td style=\"padding: 12px;\">R\u1ea5t th\u1ea5p (t\u1eadn d\u1ee5ng dung l\u01b0\u1ee3ng \u1ed5 c\u1ee9ng c\u00f3 s\u1eb5n)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><span class=\"ez-toc-section\" id=\"Vi-sao-Swap-cham-hon-RAM\"><\/span>V\u00ec sao Swap ch\u1eadm h\u01a1n RAM?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>C\u00e2u h\u1ecfi <strong>swap c\u00f3 ch\u1eadm kh\u00f4ng<\/strong> lu\u00f4n l\u00e0 th\u1eafc m\u1eafc c\u1ee7a nhi\u1ec1u ng\u01b0\u1eddi d\u00f9ng m\u1edbi. C\u00e2u tr\u1ea3 l\u1eddi ch\u1eafc ch\u1eafn l\u00e0 c\u00f3, v\u00e0 ch\u1eadm h\u01a1n r\u1ea5t nhi\u1ec1u.<\/p>\n<p>L\u00fd do n\u1eb1m \u1edf gi\u1edbi h\u1ea1n v\u1eadt l\u00fd c\u1ee7a ph\u1ea7n c\u1ee9ng. RAM giao ti\u1ebfp tr\u1ef1c ti\u1ebfp v\u1edbi CPU qua bus b\u1ed9 nh\u1edb v\u1edbi b\u0103ng th\u00f4ng c\u1ef1c l\u1edbn. Trong khi \u0111\u00f3, Swap n\u1eb1m tr\u00ean \u1ed5 c\u1ee9ng, ph\u1ea3i giao ti\u1ebfp qua c\u00e1c c\u1ed5ng k\u1ebft n\u1ed1i nh\u01b0 SATA ho\u1eb7c NVMe.<\/p>\n<ul>\n<li><strong>\u0110\u1ed9 tr\u1ec5 (Latency):<\/strong> Th\u1eddi gian \u0111\u1ec3 truy c\u1eadp m\u1ed9t \u00f4 nh\u1edb trong RAM l\u00e0 v\u00e0i nano gi\u00e2y. V\u1edbi SSD NVMe t\u1ed1t nh\u1ea5t hi\u1ec7n nay, th\u1eddi gian n\u00e0y v\u1eabn l\u00e0 v\u00e0i ch\u1ee5c micro gi\u00e2y (ch\u1eadm h\u01a1n h\u00e0ng ngh\u00ecn l\u1ea7n so v\u1edbi RAM). V\u1edbi HDD truy\u1ec1n th\u1ed1ng, con s\u1ed1 n\u00e0y l\u00e0 mili gi\u00e2y (ch\u1eadm h\u01a1n h\u00e0ng tri\u1ec7u l\u1ea7n).<\/li>\n<li><strong>IOPS &amp; Throughput:<\/strong> T\u1ed1c \u0111\u1ed9 \u0111\u1ecdc\/ghi ng\u1eabu nhi\u00ean (IOPS) c\u1ee7a RAM v\u01b0\u1ee3t xa b\u1ea5t k\u1ef3 \u1ed5 c\u1ee9ng n\u00e0o. Do \u0111\u00f3, n\u1ebfu h\u1ec7 th\u1ed1ng c\u1ee7a b\u1ea1n ph\u1ea3i s\u1eed d\u1ee5ng Swap li\u00ean t\u1ee5c (hi\u1ec7n t\u01b0\u1ee3ng Thrashing), hi\u1ec7u su\u1ea5t s\u1ebd gi\u1ea3m th\u00ea th\u1ea3m v\u00ec \u1ed5 c\u1ee9ng kh\u00f4ng k\u1ecbp \u0111\u00e1p \u1ee9ng t\u1ed1c \u0111\u1ed9 x\u1eed l\u00fd c\u1ee7a CPU.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Loi-ich-khi-su-dung-Swap-Memory\"><\/span>L\u1ee3i \u00edch khi s\u1eed d\u1ee5ng Swap Memory<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>D\u1ef1a tr\u00ean c\u00e1ch ho\u1ea1t \u0111\u1ed9ng c\u1ee7a swap memory, c\u00f3 th\u1ec3 r\u00fat ra m\u1ed9t s\u1ed1 l\u1ee3i \u00edch ch\u00ednh nh\u01b0 sau:<\/p>\n<ul>\n<li>Gi\u1ea3i ph\u00f3ng c\u00e1c v\u00f9ng RAM ch\u1ee9a d\u1eef li\u1ec7u \u00edt \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng ho\u1eb7c ch\u1ec9 d\u00f9ng trong th\u1eddi gian ng\u1eafn, t\u1eeb \u0111\u00f3 <strong>d\u00e0nh RAM cho c\u00e1c ti\u1ebfn tr\u00ecnh c\u00f3 m\u1ee9c \u01b0u ti\u00ean cao h\u01a1n<\/strong>.<\/li>\n<li>Gi\u00fap <strong>ng\u0103n ch\u1eb7n t\u00ecnh tr\u1ea1ng RAM b\u1ecb \u0111\u1ea7y \u0111\u1ed9t ng\u1ed9t<\/strong>, h\u1ea1n ch\u1ebf nguy c\u01a1 h\u1ec7 th\u1ed1ng b\u1ecb d\u1eebng ho\u1eb7c b\u1ecb OOM Killer can thi\u1ec7p.<\/li>\n<li>Ho\u1ea1t \u0111\u1ed9ng nh\u01b0 m\u1ed9t <strong>v\u00f9ng b\u1ed9 nh\u1edb b\u1ed5 sung<\/strong>, m\u1edf r\u1ed9ng kh\u00f4ng gian s\u1eed d\u1ee5ng c\u1ee7a RAM v\u1eadt l\u00fd.<\/li>\n<li>Cho ph\u00e9p h\u1ec7 th\u1ed1ng <strong>ch\u1ea1y c\u00e1c \u1ee9ng d\u1ee5ng n\u1eb7ng y\u00eau c\u1ea7u nhi\u1ec1u b\u1ed9 nh\u1edb<\/strong>, ngay c\u1ea3 khi RAM kh\u00f4ng \u0111\u1ee7 \u0111\u00e1p \u1ee9ng t\u1ee9c th\u1eddi.<\/li>\n<li>Trong qu\u00e1 tr\u00ecnh <strong>ng\u1ee7 \u0111\u00f4ng (hibernate)<\/strong>, to\u00e0n b\u1ed9 d\u1eef li\u1ec7u trong RAM s\u1ebd \u0111\u01b0\u1ee3c ghi v\u00e0o swap memory, v\u00ec v\u1eady swap l\u00e0 <strong>th\u00e0nh ph\u1ea7n c\u1ea7n thi\u1ebft \u0111\u1ec3 qu\u00e1 tr\u00ecnh n\u00e0y di\u1ec5n ra th\u00e0nh c\u00f4ng<\/strong>.<\/li>\n<li>G\u00f3p ph\u1ea7n <strong>c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t t\u1ed5ng th\u1ec3 c\u1ee7a h\u1ec7 th\u1ed1ng<\/strong> n\u1ebfu \u0111\u01b0\u1ee3c c\u1ea5u h\u00ecnh v\u00e0 s\u1eed d\u1ee5ng \u0111\u00fang c\u00e1ch (khi gi\u1ea3m OOM, kh\u00f4ng ph\u1ea3i t\u0103ng t\u1ed1c).<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-38072\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Loi-ich-khi-su-dung-Swap-Memory.jpg\" alt=\"L\u1ee3i \u00edch khi s\u1eed d\u1ee5ng Swap Memory\" width=\"800\" height=\"500\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Loi-ich-khi-su-dung-Swap-Memory.jpg 800w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Loi-ich-khi-su-dung-Swap-Memory-300x188.jpg 300w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Loi-ich-khi-su-dung-Swap-Memory-768x480.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Uu-va-nhuoc-diem-khi-su-dung-Swap\"><\/span>\u01afu v\u00e0 nh\u01b0\u1ee3c \u0111i\u1ec3m khi s\u1eed d\u1ee5ng Swap<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Vi\u1ec7c k\u00edch ho\u1ea1t Swap tr\u00ean VPS gi\u1ed1ng nh\u01b0 vi\u1ec7c mua b\u1ea3o hi\u1ec3m cho h\u1ec7 th\u1ed1ng. N\u00f3 c\u00f3 nh\u1eefng l\u1ee3i \u00edch to l\u1edbn nh\u01b0ng c\u0169ng \u0111i k\u00e8m nh\u1eefng m\u1eb7t h\u1ea1n ch\u1ebf c\u1ea7n c\u00e2n nh\u1eafc.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Uu-diem\"><\/span>\u01afu \u0111i\u1ec3m<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ol>\n<li><strong>Ng\u0103n ch\u1eb7n l\u1ed7i &#8220;Out of Memory&#8221; (OOM Killer):<\/strong> \u0110\u00e2y l\u00e0 <strong>\u01b0u \u0111i\u1ec3m Swap<\/strong> l\u1edbn nh\u1ea5t. Tr\u00ean Linux, khi RAM v\u1eadt l\u00fd h\u1ebft s\u1ea1ch, m\u1ed9t ti\u1ebfn tr\u00ecnh t\u00ean l\u00e0 OOM Killer s\u1ebd t\u1ef1 \u0111\u1ed9ng k\u00edch ho\u1ea1t v\u00e0 &#8220;gi\u1ebft&#8221; (kill) c\u00e1c \u1ee9ng d\u1ee5ng \u0111ang chi\u1ebfm nhi\u1ec1u RAM nh\u1ea5t \u0111\u1ec3 c\u1ee9u h\u1ec7 th\u1ed1ng kh\u1ecfi b\u1ecb treo c\u1ee9ng. Th\u01b0\u1eddng th\u00ec MySQL ho\u1eb7c Web Server s\u1ebd l\u00e0 n\u1ea1n nh\u00e2n \u0111\u1ea7u ti\u00ean. C\u00f3 Swap, h\u1ec7 th\u1ed1ng s\u1ebd c\u00f3 th\u00eam kh\u00f4ng gian \u0111\u1ec7m, tr\u00e1nh \u0111\u01b0\u1ee3c vi\u1ec7c c\u00e1c d\u1ecbch v\u1ee5 quan tr\u1ecdng b\u1ecb t\u1eaft \u0111\u1ed9t ng\u1ed9t.<\/li>\n<li><strong>Ti\u1ebft ki\u1ec7m chi ph\u00ed:<\/strong> V\u1edbi c\u00e1c t\u00e1c v\u1ee5 kh\u00f4ng y\u00eau c\u1ea7u t\u1ed1c \u0111\u1ed9 x\u1eed l\u00fd th\u1eddi gian th\u1ef1c nh\u01b0ng t\u1ed1n b\u1ed9 nh\u1edb (nh\u01b0 ch\u1ea1y c\u00e1c script backup, n\u00e9n file log), vi\u1ec7c d\u00f9ng Swap gi\u00fap b\u1ea1n kh\u00f4ng c\u1ea7n ph\u1ea3i mua th\u00eam RAM v\u1eadt l\u00fd \u0111\u1eaft \u0111\u1ecf.<\/li>\n<li><strong>H\u1ed7 tr\u1ee3 Hibernation:<\/strong> T\u00ednh n\u0103ng ng\u1ee7 \u0111\u00f4ng (Hibernation) tr\u00ean Linux y\u00eau c\u1ea7u l\u01b0u to\u00e0n b\u1ed9 tr\u1ea1ng th\u00e1i c\u1ee7a RAM xu\u1ed1ng \u1ed5 c\u1ee9ng \u0111\u1ec3 ph\u1ee5c h\u1ed3i sau khi kh\u1edfi \u0111\u1ed9ng l\u1ea1i. Swap ch\u00ednh l\u00e0 n\u01a1i ch\u1ee9a d\u1eef li\u1ec7u n\u00e0y.<\/li>\n<\/ol>\n<h3><span class=\"ez-toc-section\" id=\"Nhuoc-diem-%E2%80%93-Van-de-can-luu-y\"><\/span>Nh\u01b0\u1ee3c \u0111i\u1ec3m &#8211; V\u1ea5n \u0111\u1ec1 c\u1ea7n l\u01b0u \u00fd<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ol>\n<li><strong>Hi\u1ec7u n\u0103ng gi\u1ea3m s\u00fat:<\/strong> Nh\u01b0 \u0111\u00e3 ph\u00e2n t\u00edch, t\u1ed1c \u0111\u1ed9 c\u1ee7a Swap kh\u00f4ng th\u1ec3 so s\u00e1nh v\u1edbi RAM. N\u1ebfu server ph\u1ee5 thu\u1ed9c qu\u00e1 nhi\u1ec1u v\u00e0o Swap, tr\u1ea3i nghi\u1ec7m ng\u01b0\u1eddi d\u00f9ng tr\u00ean website s\u1ebd b\u1ecb \u1ea3nh h\u01b0\u1edfng (load ch\u1eadm, ph\u1ea3n h\u1ed3i l\u00e2u).<\/li>\n<li><strong>\u1ea2nh h\u01b0\u1edfng \u0111\u1ebfn tu\u1ed5i th\u1ecd \u1ed5 c\u1ee9ng (\u0110\u1eb7c bi\u1ec7t l\u00e0 SSD):<\/strong> Vi\u1ec7c s\u1eed d\u1ee5ng <strong>Swap tr\u00ean SSD<\/strong> c\u1ea7n \u0111\u01b0\u1ee3c t\u00ednh to\u00e1n k\u1ef9. \u1ed4 c\u1ee9ng SSD c\u00f3 gi\u1edbi h\u1ea1n s\u1ed1 l\u1ea7n ghi (TBW &#8211; Terabytes Written). Ho\u1ea1t \u0111\u1ed9ng Swapping in\/out li\u00ean t\u1ee5c t\u1ea1o ra l\u01b0\u1ee3ng l\u1edbn thao t\u00e1c ghi\/x\u00f3a, v\u1ec1 l\u00e2u d\u00e0i c\u00f3 th\u1ec3 l\u00e0m gi\u1ea3m tu\u1ed5i th\u1ecd c\u1ee7a chip nh\u1edb flash tr\u00ean SSD. Tuy nhi\u00ean, v\u1edbi c\u00f4ng ngh\u1ec7 SSD hi\u1ec7n \u0111\u1ea1i, v\u1ea5n \u0111\u1ec1 n\u00e0y \u0111\u00e3 gi\u1ea3m \u0111i \u0111\u00e1ng k\u1ec3 \u0111\u1ed1i v\u1edbi c\u00e1c VPS c\u00f3 m\u1ee9c s\u1eed d\u1ee5ng trung b\u00ecnh.<\/li>\n<\/ol>\n<blockquote><p><strong>L\u1eddi khuy\u00ean:<\/strong> Ch\u1ec9 n\u00ean coi Swap l\u00e0 ph\u01b0\u01a1ng \u00e1n d\u1ef1 ph\u00f2ng (backup plan). \u0110\u1eebng bao gi\u1edd xem Swap l\u00e0 gi\u1ea3i ph\u00e1p thay th\u1ebf ho\u00e0n to\u00e0n cho vi\u1ec7c thi\u1ebfu h\u1ee5t RAM v\u1eadt l\u00fd tr\u1ea7m tr\u1ecdng trong th\u1eddi gian d\u00e0i.<\/p><\/blockquote>\n<h2><span class=\"ez-toc-section\" id=\"Co-nen-dung-Swap-Memory-khong\"><\/span>C\u00f3 n\u00ean d\u00f9ng Swap Memory kh\u00f4ng?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>C\u00e2u tr\u1ea3 l\u1eddi ph\u1ee5 thu\u1ed9c v\u00e0o m\u1ee5c \u0111\u00edch s\u1eed d\u1ee5ng VPS v\u00e0 \u1ee9ng d\u1ee5ng b\u1ea1n \u0111ang v\u1eadn h\u00e0nh. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 ph\u00e2n t\u00edch c\u1ee5 th\u1ec3 cho c\u00e1c tr\u01b0\u1eddng h\u1ee3p \u0111\u1ec3 b\u1ea1n quy\u1ebft \u0111\u1ecbnh <strong>c\u00f3 n\u00ean d\u00f9ng swap memory<\/strong> hay kh\u00f4ng.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Truong-hop-NEN-dung-Swap\"><\/span>Tr\u01b0\u1eddng h\u1ee3p N\u00caN d\u00f9ng Swap<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li><strong>VPS c\u00f3 l\u01b0\u1ee3ng RAM th\u1ea5p (512MB &#8211; 2GB):<\/strong> \u0110\u00e2y l\u00e0 nh\u00f3m \u0111\u1ed1i t\u01b0\u1ee3ng b\u1eaft bu\u1ed9c ph\u1ea3i c\u00f3 Swap. Ch\u1ec9 c\u1ea7n h\u1ec7 \u0111i\u1ec1u h\u00e0nh v\u00e0 m\u1ed9t v\u00e0i d\u1ecbch v\u1ee5 c\u01a1 b\u1ea3n ch\u1ea1y l\u00ean \u0111\u00e3 chi\u1ebfm g\u1ea7n h\u1ebft RAM. Swap s\u1ebd gi\u00fap VPS kh\u00f4ng b\u1ecb treo khi c\u00f3 m\u1ed9t l\u01b0\u1ee3ng truy c\u1eadp t\u0103ng \u0111\u1ed9t bi\u1ebfn nh\u1eb9.<\/li>\n<li><strong>Web Server \/ WordPress Blog:<\/strong> C\u00e1c website tin t\u1ee9c, blog c\u00e1 nh\u00e2n th\u01b0\u1eddng c\u00f3 l\u01b0\u1ee3ng truy c\u1eadp kh\u00f4ng \u0111\u1ec1u. <strong>B\u1eadt swap cho vps<\/strong> ch\u1ea1y Web Server l\u00e0 m\u1ed9t bi\u1ec7n ph\u00e1p an to\u00e0n \u0111\u1ec3 x\u1eed l\u00fd c\u00e1c ti\u1ebfn tr\u00ecnh PHP-FPM ho\u1eb7c <a href=\"https:\/\/interdata.vn\/blog\/apache-la-gi\/\">Apache<\/a> workers khi traffic t\u0103ng cao.<\/li>\n<li><strong>Ch\u1ea1y c\u00e1c c\u00f4ng c\u1ee5 SEO \/ Cronjob \/ Automation:<\/strong> C\u00e1c tool n\u00e0y th\u01b0\u1eddng ch\u1ea1y ng\u1ea7m v\u00e0 kh\u00f4ng y\u00eau c\u1ea7u ph\u1ea3n h\u1ed3i t\u1ee9c th\u00ec. Ch\u00fang c\u00f3 th\u1ec3 ho\u1ea1t \u0111\u1ed9ng t\u1ed1t ngay c\u1ea3 khi m\u1ed9t ph\u1ea7n d\u1eef li\u1ec7u b\u1ecb \u0111\u1ea9y xu\u1ed1ng Swap.<\/li>\n<\/ul>\n<h3><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-38073\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Truong-hop-dung-Swap-Memory.jpg\" alt=\"Tr\u01b0\u1eddng h\u1ee3p d\u00f9ng Swap Memory\" width=\"800\" height=\"500\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Truong-hop-dung-Swap-Memory.jpg 800w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Truong-hop-dung-Swap-Memory-300x188.jpg 300w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Truong-hop-dung-Swap-Memory-768x480.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/h3>\n<h3><span class=\"ez-toc-section\" id=\"Truong-hop-KHONG-NEN-lam-dung-Swap\"><\/span>Tr\u01b0\u1eddng h\u1ee3p KH\u00d4NG N\u00caN l\u1ea1m d\u1ee5ng Swap<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li><strong><a href=\"https:\/\/interdata.vn\/blog\/database-server-la-gi\/\">Database Server<\/a> l\u1edbn (MySQL, <a href=\"https:\/\/interdata.vn\/blog\/postgresql-la-gi\/\">PostgreSQL<\/a>, Cassandra):<\/strong> C\u00e1c c\u01a1 s\u1edf d\u1eef li\u1ec7u lu\u00f4n c\u1ea7n t\u1ed1c \u0111\u1ed9 truy xu\u1ea5t nhanh nh\u1ea5t. N\u1ebfu d\u1eef li\u1ec7u c\u1ee7a Database b\u1ecb \u0111\u1ea9y xu\u1ed1ng Swap, t\u1ed1c \u0111\u1ed9 truy v\u1ea5n (Query) s\u1ebd ch\u1eadm \u0111i \u0111\u00e1ng k\u1ec3, g\u00e2y ngh\u1ebdn c\u1ed5 chai cho to\u00e0n b\u1ed9 h\u1ec7 th\u1ed1ng.<\/li>\n<li><strong>\u1ee8ng d\u1ee5ng Real-time (Th\u1eddi gian th\u1ef1c):<\/strong> C\u00e1c \u1ee9ng d\u1ee5ng chat, streaming, giao d\u1ecbch t\u00e0i ch\u00ednh y\u00eau c\u1ea7u \u0111\u1ed9 tr\u1ec5 th\u1ea5p. Vi\u1ec7c ch\u1edd \u0111\u1ee3i d\u1eef li\u1ec7u n\u1ea1p t\u1eeb \u1ed5 c\u1ee9ng l\u00ean RAM l\u00e0 kh\u00f4ng th\u1ec3 ch\u1ea5p nh\u1eadn \u0111\u01b0\u1ee3c.<\/li>\n<li><strong>H\u1ec7 th\u1ed1ng \u0111ang b\u1ecb Swap Thrashing:<\/strong> N\u1ebfu b\u1ea1n th\u1ea5y \u0111\u00e8n \u1ed5 c\u1ee9ng s\u00e1ng li\u00ean t\u1ee5c v\u00e0 Swap usage lu\u00f4n \u1edf m\u1ee9c 100%, \u0111\u00f3 l\u00e0 l\u00fac b\u1ea1n kh\u00f4ng n\u00ean c\u1ed1 d\u00f9ng Swap n\u1eefa m\u00e0 c\u1ea7n n\u00e2ng c\u1ea5p RAM th\u1eadt.<\/li>\n<\/ul>\n<div class=\"highlight-cta-box\"><span style=\"color: #ed1c24;\"><strong>T\u0103ng t\u1ed1c Website v\u1edbi VPS NVMe Hi\u1ec7u N\u0103ng Cao t\u1eeb InterData<\/strong><\/span><br \/>\nN\u1ebfu vi\u1ec7c c\u1ea5u h\u00ecnh Swap v\u1eabn kh\u00f4ng \u0111\u1ee7 \u0111\u00e1p \u1ee9ng nhu c\u1ea7u t\u00e0i nguy\u00ean c\u1ee7a b\u1ea1n, \u0111\u00e3 \u0111\u1ebfn l\u00fac n\u00e2ng c\u1ea5p l\u00ean h\u1ea1 t\u1ea7ng m\u1ea1nh m\u1ebd h\u01a1n. B\u1ea1n c\u1ea7n m\u1ed9t gi\u1ea3i ph\u00e1p VPS \u1ed5n \u0111\u1ecbnh, h\u1ea1n ch\u1ebf t\u1ed1i \u0111a vi\u1ec7c ph\u1ea3i d\u00f9ng \u0111\u1ebfn Swap? InterData cung c\u1ea5p c\u00e1c g\u00f3i VPS t\u1ed1c \u0111\u1ed9 cao, <strong>s\u1eed d\u1ee5ng 100% \u1ed5 c\u1ee9ng SSD NVMe U.2<\/strong>, \u0111\u1ea3m b\u1ea3o t\u1ed1c \u0111\u1ed9 truy xu\u1ea5t d\u1eef li\u1ec7u nhanh g\u1ea5p 10 l\u1ea7n SSD th\u00f4ng th\u01b0\u1eddng.<br \/>\n\u2705 B\u0103ng th\u00f4ng kh\u00f4ng gi\u1edbi h\u1ea1n &#8211; Ch\u1ea5p m\u1ecdi traffic.<br \/>\n\u2705 CPU th\u1ebf h\u1ec7 m\u1edbi &#8211; X\u1eed l\u00fd t\u00e1c v\u1ee5 m\u01b0\u1ee3t m\u00e0.<br \/>\n\u2705 H\u1ed7 tr\u1ee3 k\u1ef9 thu\u1eadt 24\/7 &#8211; An t\u00e2m v\u1eadn h\u00e0nh.<br \/>\n\u2705 To\u00e0n quy\u1ec1n qu\u1ea3n tr\u1ecb<br \/>\n\u2705 D\u1ec5 d\u00e0ng n\u00e2ng c\u1ea5p c\u1ea5u h\u00ecnh<br \/>\n\u2705 Uptime cao<br \/>\n\u2705 Ch\u1ebf \u0111\u1ed9 d\u00f9ng th\u1eed v\u00e0 ho\u00e0n ti\u1ec1n minh b\u1ea1ch n\u1ebfu kh\u00e1ch h\u00e0ng kh\u00f4ng h\u00e0i l\u00f2ng<br \/>\n<a href=\"https:\/\/interdata.vn\/thue-vps\/\" class=\"button primary is-primary is-medium\"  >\n\t\t<span>\u0110\u0103ng k\u00fd tr\u1ea3i nghi\u1ec7m VPS 7 ng\u00e0y mi\u1ec5n ph\u00ed ngay!<\/span>\n\t<\/a>\n<\/div>\n<h2><span class=\"ez-toc-section\" id=\"Nen-thiet-lap-dung-luong-Swap-bao-nhieu-la-phu-hop\"><\/span>N\u00ean thi\u1ebft l\u1eadp dung l\u01b0\u1ee3ng Swap bao nhi\u00eau l\u00e0 ph\u00f9 h\u1ee3p?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>V\u1ec1 b\u1ea3n ch\u1ea5t, <strong>swap memory ch\u1ec9 \u0111\u00f3ng vai tr\u00f2 nh\u01b0 m\u1ed9t ph\u01b0\u01a1ng \u00e1n d\u1ef1 ph\u00f2ng<\/strong> trong tr\u01b0\u1eddng h\u1ee3p h\u1ec7 th\u1ed1ng b\u1ecb thi\u1ebfu RAM \u0111\u1ed9t ng\u1ed9t. V\u00ec v\u1eady, dung l\u01b0\u1ee3ng swap <strong>kh\u00f4ng n\u00ean thi\u1ebft l\u1eadp qu\u00e1 l\u1edbn<\/strong>, m\u00e0 ch\u1ec9 c\u1ea7n \u1edf m\u1ee9c t\u1ed1i \u0111a <strong>b\u1eb1ng kho\u1ea3ng m\u1ed9t n\u1eeda dung l\u01b0\u1ee3ng RAM v\u1eadt l\u00fd<\/strong> l\u00e0 h\u1ee3p l\u00fd.<\/p>\n<p>C\u1ea7n l\u01b0u \u00fd r\u1eb1ng <strong>swap c\u00f3 t\u1ed1c \u0111\u1ed9 x\u1eed l\u00fd ch\u1eadm h\u01a1n RAM r\u1ea5t nhi\u1ec1u<\/strong>. Do \u0111\u00f3, n\u1ebfu VPS ho\u1eb7c Server c\u1ee7a b\u1ea1n th\u01b0\u1eddng xuy\u00ean s\u1eed d\u1ee5ng swap v\u1edbi t\u1ea7n su\u1ea5t cao, \u0111\u00e2y l\u00e0 <strong>d\u1ea5u hi\u1ec7u c\u1ea3nh b\u00e1o r\u00f5 r\u00e0ng cho th\u1ea5y RAM hi\u1ec7n t\u1ea1i kh\u00f4ng c\u00f2n \u0111\u00e1p \u1ee9ng \u0111\u1ee7 nhu c\u1ea7u v\u1eadn h\u00e0nh<\/strong> v\u00e0 c\u1ea7n \u0111\u01b0\u1ee3c n\u00e2ng c\u1ea5p c\u00e0ng s\u1edbm c\u00e0ng t\u1ed1t.<\/p>\n<p>B\u00ean c\u1ea1nh \u0111\u00f3, <strong>t\u1ed1c \u0111\u1ed9 \u0111\u1ecdc\/ghi c\u1ee7a \u1ed5 c\u1ee9ng<\/strong> (\u0111\u1eb7c bi\u1ec7t l\u00e0 HDD ho\u1eb7c \u1ed5 l\u01b0u tr\u1eef d\u00f9ng chung) c\u0169ng l\u00e0 m\u1ed9t y\u1ebfu t\u1ed1 quan tr\u1ecdng. Khi \u1ed5 c\u1ee9ng ch\u1eadm, vi\u1ec7c s\u1eed d\u1ee5ng swap kh\u00f4ng nh\u1eefng kh\u00f4ng c\u1ea3i thi\u1ec7n hi\u1ec7u n\u0103ng m\u00e0 c\u00f2n c\u00f3 th\u1ec3 khi\u1ebfn h\u1ec7 th\u1ed1ng ho\u1ea1t \u0111\u1ed9ng k\u00e9m \u1ed5n \u0111\u1ecbnh, \u0111\u1ed3ng th\u1eddi <strong>l\u00e0m l\u00e3ng ph\u00ed t\u00e0i nguy\u00ean RAM<\/strong>.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Tan-suat-Swap-bao-nhieu-la-hop-li\"><\/span>T\u1ea7n su\u1ea5t Swap bao nhi\u00eau l\u00e0 h\u1ee3p l\u00ed?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Tr\u00ean h\u1ec7 \u0111i\u1ec1u h\u00e0nh Linux, b\u1ea1n c\u00f3 th\u1ec3 <strong>t\u00f9y ch\u1ec9nh m\u1ee9c \u0111\u1ed9 \u01b0u ti\u00ean s\u1eed d\u1ee5ng swap<\/strong> th\u00f4ng qua tham s\u1ed1 swappiness, v\u1edbi gi\u00e1 tr\u1ecb n\u1eb1m trong kho\u1ea3ng <strong>t\u1eeb 0 \u0111\u1ebfn 100<\/strong>.<\/p>\n<p>Khi thi\u1ebft l\u1eadp <strong>gi\u00e1 tr\u1ecb swappiness th\u1ea5p<\/strong>, h\u1ec7 th\u1ed1ng s\u1ebd <strong>h\u1ea1n ch\u1ebf s\u1eed d\u1ee5ng swap<\/strong>, ch\u1ec9 th\u1ef1c hi\u1ec7n swapping khi dung l\u01b0\u1ee3ng RAM v\u1eadt l\u00fd g\u1ea7n nh\u01b0 c\u1ea1n ki\u1ec7t. Ng\u01b0\u1ee3c l\u1ea1i, n\u1ebfu \u0111\u1eb7t <strong>gi\u00e1 tr\u1ecb swappiness cao<\/strong>, h\u1ec7 \u0111i\u1ec1u h\u00e0nh s\u1ebd <strong>ch\u1ee7 \u0111\u1ed9ng \u0111\u1ea9y d\u1eef li\u1ec7u sang swap th\u01b0\u1eddng xuy\u00ean h\u01a1n<\/strong>, ngay c\u1ea3 khi RAM v\u1eabn c\u00f2n kh\u1ea3 d\u1ee5ng.<\/p>\n<p>Ch\u00ednh v\u00ec v\u1eady, <strong>kh\u00f4ng t\u1ed3n t\u1ea1i m\u1ed9t con s\u1ed1 swappiness \u201cchu\u1ea9n\u201d cho m\u1ecdi tr\u01b0\u1eddng h\u1ee3p<\/strong>. M\u1ee9c thi\u1ebft l\u1eadp ph\u00f9 h\u1ee3p s\u1ebd ph\u1ee5 thu\u1ed9c v\u00e0o h\u1ea1 t\u1ea7ng l\u01b0u tr\u1eef v\u00e0 lo\u1ea1i m\u00e1y ch\u1ee7 \u0111ang s\u1eed d\u1ee5ng.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-38074\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Tan-suat-Swap-bao-nhieu-la-hop-li.jpg\" alt=\"T\u1ea7n su\u1ea5t Swap bao nhi\u00eau l\u00e0 h\u1ee3p l\u00ed\" width=\"800\" height=\"500\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Tan-suat-Swap-bao-nhieu-la-hop-li.jpg 800w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Tan-suat-Swap-bao-nhieu-la-hop-li-300x188.jpg 300w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Tan-suat-Swap-bao-nhieu-la-hop-li-768x480.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/p>\n<p>\u0110\u1ed1i v\u1edbi <strong>server v\u1eadt l\u00fd s\u1eed d\u1ee5ng \u1ed5 SSD g\u1eafn tr\u1ef1c ti\u1ebfp<\/strong>, t\u1ed1c \u0111\u1ed9 truy xu\u1ea5t t\u01b0\u01a1ng \u0111\u1ed1i t\u1ed1t, b\u1ea1n c\u00f3 th\u1ec3 c\u00e2n nh\u1eafc \u0111\u1eb7t swappiness trong kho\u1ea3ng <strong>20\u201360<\/strong> \u0111\u1ec3 c\u00e2n b\u1eb1ng gi\u1eefa hi\u1ec7u n\u0103ng v\u00e0 \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh.<\/p>\n<p>Trong khi \u0111\u00f3, v\u1edbi <strong>m\u00e1y ch\u1ee7 \u1ea3o (VPS)<\/strong> \u2013 n\u01a1i \u1ed5 c\u1ee9ng th\u01b0\u1eddng \u0111\u01b0\u1ee3c chia s\u1ebb cho nhi\u1ec1u h\u1ec7 th\u1ed1ng kh\u00e1c \u2013 hi\u1ec7u qu\u1ea3 c\u1ee7a swap kh\u00f4ng cao. Trong tr\u01b0\u1eddng h\u1ee3p n\u00e0y, <strong>n\u00ean \u0111\u1eb7t swappiness th\u1ea5p<\/strong>, th\u01b0\u1eddng ch\u1ec9 kho\u1ea3ng <strong>0\u201310<\/strong>, nh\u1eb1m h\u1ea1n ch\u1ebf vi\u1ec7c truy xu\u1ea5t \u1ed5 c\u1ee9ng kh\u00f4ng c\u1ea7n thi\u1ebft.<\/p>\n<p>D\u00f9 \u1edf b\u1ea5t k\u1ef3 k\u1ecbch b\u1ea3n n\u00e0o, <strong>swap memory kh\u00f4ng n\u00ean b\u1ecb l\u1ea1m d\u1ee5ng<\/strong>. \u0110\u00e2y ch\u1ec9 l\u00e0 gi\u1ea3i ph\u00e1p t\u1ea1m th\u1eddi khi b\u1ed9 nh\u1edb kh\u00f4ng \u0111\u1ee7 \u0111\u00e1p \u1ee9ng nhu c\u1ea7u t\u1ee9c th\u1eddi. \u0110\u1ec3 gi\u1ea3i quy\u1ebft tri\u1ec7t \u0111\u1ec3 v\u1ea5n \u0111\u1ec1 hi\u1ec7u n\u0103ng, <strong>n\u00e2ng c\u1ea5p RAM ho\u1eb7c h\u1ec7 th\u1ed1ng l\u01b0u tr\u1eef v\u1eabn l\u00e0 ph\u01b0\u01a1ng \u00e1n b\u1ec1n v\u1eefng h\u01a1n<\/strong>.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Swap-Memory-co-lam-cham-VPS-Khong\"><\/span>Swap Memory c\u00f3 l\u00e0m ch\u1eadm VPS Kh\u00f4ng?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u0110\u00e2y l\u00e0 m\u1ed9t hi\u1ec3u l\u1ea7m ph\u1ed5 bi\u1ebfn. Th\u1ef1c t\u1ebf, b\u1ea3n th\u00e2n <strong>Swap kh\u00f4ng l\u00e0m ch\u1eadm VPS<\/strong>. Swap ch\u1ec9 l\u00e0 m\u1ed9t kho ch\u1ee9a. Th\u1ee9 l\u00e0m ch\u1eadm VPS l\u00e0 t\u00ecnh tr\u1ea1ng <strong>thi\u1ebfu RAM<\/strong>.<\/p>\n<p>Khi h\u1ec7 th\u1ed1ng ph\u1ea3i d\u00f9ng \u0111\u1ebfn Swap, ngh\u0129a l\u00e0 RAM \u0111\u00e3 h\u1ebft. N\u1ebfu kh\u00f4ng c\u00f3 Swap, h\u1ec7 th\u1ed1ng s\u1ebd treo ho\u1eb7c t\u1eaft \u1ee9ng d\u1ee5ng (nhanh h\u01a1n nh\u01b0ng g\u00e2y m\u1ea5t d\u1eef li\u1ec7u\/gi\u00e1n \u0111o\u1ea1n d\u1ecbch v\u1ee5). N\u1ebfu c\u00f3 Swap, h\u1ec7 th\u1ed1ng v\u1eabn ch\u1ea1y nh\u01b0ng ch\u1eadm h\u01a1n (do t\u1ed1c \u0111\u1ed9 \u1ed5 c\u1ee9ng). V\u1eady n\u00ean, s\u1ef1 ch\u1eadm ch\u1ea1p l\u00e0 h\u1ec7 qu\u1ea3 c\u1ee7a vi\u1ec7c ph\u1ea7n c\u1ee9ng kh\u00f4ng \u0111\u00e1p \u1ee9ng \u0111\u1ee7 nhu c\u1ea7u ph\u1ea7n m\u1ec1m, Swap ch\u1ec9 \u0111ang c\u1ed1 g\u1eafng duy tr\u00ec s\u1ef1 s\u1ed1ng cho h\u1ec7 th\u1ed1ng.<\/p>\n<ul>\n<li><strong>Swap usage th\u1ea5p (&lt; 20%):<\/strong> Ho\u00e0n to\u00e0n b\u00ecnh th\u01b0\u1eddng v\u00e0 t\u1ed1t. H\u1ec7 th\u1ed1ng \u0111ang chuy\u1ec3n c\u00e1c d\u1eef li\u1ec7u r\u00e1c, kh\u00f4ng d\u00f9ng \u0111\u1ebfn xu\u1ed1ng Swap \u0111\u1ec3 nh\u01b0\u1eddng RAM cho \u1ee9ng d\u1ee5ng ch\u00ednh. L\u00fac n\u00e0y Swap kh\u00f4ng l\u00e0m ch\u1eadm m\u00e1y m\u00e0 c\u00f2n gi\u00fap m\u00e1y ch\u1ea1y hi\u1ec7u qu\u1ea3 h\u01a1n.<\/li>\n<li><strong>Swap usage cao &amp; I\/O Wait cao:<\/strong> \u0110\u00e2y l\u00e0 l\u00fac <strong>swap l\u00e0m ch\u1eadm vps<\/strong>. \u1ed4 c\u1ee9ng ph\u1ea3i \u0111\u1ecdc ghi li\u00ean t\u1ee5c. Gi\u1ea3i ph\u00e1p duy nh\u1ea5t l\u00e0 t\u1ed1i \u01b0u l\u1ea1i m\u00e3 ngu\u1ed3n website ho\u1eb7c n\u00e2ng c\u1ea5p RAM.<\/li>\n<\/ul>\n<p>D\u1eef li\u1ec7u th\u1ef1c t\u1ebf cho th\u1ea5y:<\/p>\n<ul>\n<li><strong>\u0110\u1ed9 tr\u1ec5 RAM<\/strong>: ~10-100 nanoseconds.<\/li>\n<li><strong>\u0110\u1ed9 tr\u1ec5 SSD<\/strong>: ~50-150 microseconds (ch\u1eadm h\u01a1n 500-1000 l\u1ea7n so v\u1edbi RAM).<\/li>\n<\/ul>\n<p>Do \u0111\u00f3, d\u00f9 <strong>swap memory t\u1ed1t hay x\u1ea5u<\/strong>, n\u00f3 v\u1eabn l\u00e0 gi\u1ea3i ph\u00e1p \u0111\u00e1nh \u0111\u1ed5i gi\u1eefa t\u1ed1c \u0111\u1ed9 v\u00e0 s\u1ef1 \u1ed5n \u0111\u1ecbnh.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"2-hinh-thuc-Swap-Memory-pho-bien\"><\/span>2 h\u00ecnh th\u1ee9c Swap Memory ph\u1ed5 bi\u1ebfn<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Swap memory tr\u00ean VPS ch\u1ee7 y\u1ebfu c\u00f3 hai h\u00ecnh th\u1ee9c ph\u1ed5 bi\u1ebfn: swap partition v\u00e0 swap file, c\u1ea3 hai \u0111\u1ec1u d\u00f9ng ph\u1ea7n kh\u00f4ng gian \u0111\u0129a l\u00e0m b\u1ed9 nh\u1edb \u1ea3o thay th\u1ebf RAM.\u200b<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Swap-Partition\"><\/span>Swap Partition<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u0110\u00e2y l\u00e0 ph\u00e2n v\u00f9ng ri\u00eang bi\u1ec7t tr\u00ean \u1ed5 c\u1ee9ng, \u0111\u01b0\u1ee3c t\u1ea1o l\u00fac c\u00e0i \u0111\u1eb7t h\u1ec7 \u0111i\u1ec1u h\u00e0nh Linux v\u00e0 t\u1ef1 \u0111\u1ed9ng mount khi kh\u1edfi \u0111\u1ed9ng. Ph\u00f9 h\u1ee3p cho VPS \u1ed5n \u0111\u1ecbnh l\u00e2u d\u00e0i, nh\u01b0ng kh\u00f3 thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc sau khi t\u1ea1o v\u00ec c\u1ea7n resize ph\u00e2n v\u00f9ng.\u200b<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Swap-File\"><\/span>Swap File<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>L\u00e0 file \u0111\u1eb7c bi\u1ec7t tr\u00ean h\u1ec7 th\u1ed1ng file hi\u1ec7n c\u00f3 (nh\u01b0 \/), d\u1ec5 t\u1ea1o, ch\u1ec9nh s\u1eeda ho\u1eb7c x\u00f3a b\u1eb1ng l\u1ec7nh m\u00e0 kh\u00f4ng c\u1ea7n partition m\u1edbi. Linh ho\u1ea1t h\u01a1n cho VPS, th\u01b0\u1eddng d\u00f9ng tr\u00ean SSD \u0111\u1ec3 gi\u1ea3m \u0111\u1ed9 tr\u1ec5, v\u00e0 ph\u1ed5 bi\u1ebfn v\u00ec kh\u00f4ng y\u00eau c\u1ea7u reboot to\u00e0n b\u1ed9.\u200b<\/p>\n<h3><span class=\"ez-toc-section\" id=\"So-sanh-2-hinh-thuc\"><\/span>So s\u00e1nh 2 h\u00ecnh th\u1ee9c<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<table style=\"width: 100%; border-collapse: collapse; font-family: Arial, Helvetica, sans-serif; font-size: 15px; line-height: 1.6; box-shadow: 0 4px 12px rgba(0,0,0,0.08); border-radius: 10px; overflow: hidden;\">\n<thead>\n<tr style=\"background: linear-gradient(90deg, #0C40F4, #077FFA, #0497FC); color: #ffffff;\">\n<th style=\"padding: 14px 12px; text-align: left; width: 25%;\">Ti\u00eau ch\u00ed<\/th>\n<th style=\"padding: 14px 12px; text-align: left; width: 37.5%;\">Swap Partition<\/th>\n<th style=\"padding: 14px 12px; text-align: left; width: 37.5%;\">Swap File<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"background-color: #ffffff;\">\n<td style=\"padding: 12px; font-weight: 600;\">T\u1ea1o \/ Mount<\/td>\n<td style=\"padding: 12px;\">L\u00fac c\u00e0i OS, thi\u1ebft l\u1eadp t\u1ef1 \u0111\u1ed9ng<\/td>\n<td style=\"padding: 12px;\">T\u1ea1o b\u1eb1ng l\u1ec7nh th\u1ee7 c\u00f4ng, linh ho\u1ea1t<\/td>\n<\/tr>\n<tr style=\"background-color: #f4f7ff;\">\n<td style=\"padding: 12px; font-weight: 600;\">Thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc<\/td>\n<td style=\"padding: 12px;\">Kh\u00f3, c\u1ea7n resize partition<\/td>\n<td style=\"padding: 12px;\">D\u1ec5, t\u1ea1o ho\u1eb7c x\u00f3a file swap m\u1edbi<\/td>\n<\/tr>\n<tr style=\"background-color: #ffffff;\">\n<td style=\"padding: 12px; font-weight: 600;\">Hi\u1ec7u su\u1ea5t<\/td>\n<td style=\"padding: 12px;\">T\u1ed1t h\u01a1n m\u1ed9t ch\u00fat n\u1ebfu native<\/td>\n<td style=\"padding: 12px;\">T\u01b0\u01a1ng \u0111\u01b0\u01a1ng tr\u00ean SSD\/NVMe<\/td>\n<\/tr>\n<tr style=\"background-color: #f4f7ff;\">\n<td style=\"padding: 12px; font-weight: 600;\">Ph\u00f9 h\u1ee3p VPS<\/td>\n<td style=\"padding: 12px;\">Server c\u1ed1 \u0111\u1ecbnh, \u00edt thay \u0111\u1ed5i<\/td>\n<td style=\"padding: 12px;\">VPS \u0111\u1ed9ng, d\u1ec5 qu\u1ea3n l\u00fd &amp; m\u1edf r\u1ed9ng<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><span class=\"ez-toc-section\" id=\"Cach-tao-Swap-Memory-tren-Ubuntu-CentOS-Linux\"><\/span>C\u00e1ch t\u1ea1o Swap Memory tr\u00ean Ubuntu &amp; CentOS Linux<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Vi\u1ec7c th\u00eam swap memory tr\u00ean Ubuntu ho\u1eb7c CentOS Linux \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n qua 4 b\u01b0\u1edbc c\u01a1 b\u1ea3n. Trong qu\u00e1 tr\u00ecnh thao t\u00e1c, b\u1ea1n c\u1ea7n s\u1eed d\u1ee5ng t\u00e0i kho\u1ea3n root ho\u1eb7c user c\u00f3 quy\u1ec1n sudo \u0111\u1ec3 ch\u1ea1y c\u00e1c c\u00e2u l\u1ec7nh h\u1ec7 th\u1ed1ng li\u00ean quan \u0111\u1ebfn swap.<\/p>\n<p><strong>Ki\u1ec3m tra h\u1ec7 th\u1ed1ng \u0111\u00e3 k\u00edch ho\u1ea1t Swap hay ch\u01b0a<\/strong><\/p>\n<pre>Swapon \u2013s\r\n\r\nfree \u2013m<\/pre>\n<figure id=\"attachment_38078\" aria-describedby=\"caption-attachment-38078\" style=\"width: 600px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-38078\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Swap-hien-dang-la-0.png\" alt=\"Swap hi\u1ec7n \u0111ang l\u00e0 0\" width=\"600\" height=\"350\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Swap-hien-dang-la-0.png 600w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Swap-hien-dang-la-0-300x175.png 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><figcaption id=\"caption-attachment-38078\" class=\"wp-caption-text\">Swap hi\u1ec7n \u0111ang l\u00e0 0<\/figcaption><\/figure>\n<p><strong>H\u01b0\u1edbng d\u1eabn t\u1ea1o Swap File Tr\u00ean Linux<\/strong><\/p>\n<p>\u0110\u1ec3 t\u1ea1o swap file, b\u1ea1n c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng l\u1ec7nh sau:<\/p>\n<pre>sudo fallocate -l 4G \/Swapfile<\/pre>\n<p>Trong tr\u01b0\u1eddng h\u1ee3p l\u1ec7nh fallocate g\u1eb7p l\u1ed7i khi k\u00edch ho\u1ea1t swap v\u1edbi th\u00f4ng b\u00e1o:<\/p>\n<pre>Swapon: \/Swapfile: Swapon failed: Invalid argument<\/pre>\n<p>B\u1ea1n c\u00f3 th\u1ec3 chuy\u1ec3n sang t\u1ea1o swap file b\u1eb1ng l\u1ec7nh dd nh\u01b0 sau:<\/p>\n<pre>sudo dd if=\/dev\/zero of=\/Swapfile count=2048 bs=1MiB<\/pre>\n<p>L\u1ec7nh tr\u00ean s\u1ebd t\u1ea1o swap file c\u00f3 dung l\u01b0\u1ee3ng <strong>2GB<\/strong>. N\u1ebfu c\u1ea7n thay \u0111\u1ed5i dung l\u01b0\u1ee3ng, b\u1ea1n ch\u1ec9 c\u1ea7n \u0111i\u1ec1u ch\u1ec9nh gi\u00e1 tr\u1ecb <code>count<\/code>, trong \u0111\u00f3:<\/p>\n<ul>\n<li><code>1024<\/code> t\u01b0\u01a1ng \u1ee9ng <strong>1GB<\/strong><\/li>\n<li><code>2048<\/code> t\u01b0\u01a1ng \u1ee9ng <strong>2GB<\/strong><\/li>\n<\/ul>\n<p>Sau khi t\u1ea1o xong swap file, c\u1ea7n thi\u1ebft l\u1eadp quy\u1ec1n truy c\u1eadp sao cho <strong>ch\u1ec9 root user c\u00f3 quy\u1ec1n \u0111\u1ecdc\/ghi<\/strong>:<\/p>\n<pre>sudo chmod 600 \/Swapfile<\/pre>\n<p><strong>T\u1ea1o v\u00e0 k\u00edch ho\u1ea1t Swap t\u1eeb Swap File<\/strong><\/p>\n<p>Ti\u1ebfp theo, ti\u1ebfn h\u00e0nh kh\u1edfi t\u1ea1o swap space t\u1eeb swap file v\u1eeba t\u1ea1o:<\/p>\n<pre> sudo mkSwap \/Swapfile Setting up Swapspace version 1, size = 2097148 KiB no label, UUID=26b9481b-e2f4-4c14-8fd3-f45c6babb8e1<\/pre>\n<p>Sau khi swap space \u0111\u01b0\u1ee3c t\u1ea1o th\u00e0nh c\u00f4ng, k\u00edch ho\u1ea1t swap b\u1eb1ng l\u1ec7nh:<\/p>\n<pre>\u00a0sudo swapon \/Swapfile<\/pre>\n<p>Cu\u1ed1i c\u00f9ng, ki\u1ec3m tra l\u1ea1i swap \u0111\u00e3 ho\u1ea1t \u0111\u1ed9ng hay ch\u01b0a b\u1eb1ng c\u00e1c l\u1ec7nh \u0111\u00e3 s\u1eed d\u1ee5ng tr\u01b0\u1edbc \u0111\u00f3:<\/p>\n<pre>swapon -s\r\nfree \u2013m<\/pre>\n<figure id=\"attachment_38077\" aria-describedby=\"caption-attachment-38077\" style=\"width: 600px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-38077\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Swap-da-duoc-them-vao-2GB-dung-luong.png\" alt=\"Swap \u0111\u00e3 \u0111\u01b0\u1ee3c th\u00eam v\u00e0o 2GB dung l\u01b0\u1ee3ng\" width=\"600\" height=\"350\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Swap-da-duoc-them-vao-2GB-dung-luong.png 600w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Swap-da-duoc-them-vao-2GB-dung-luong-300x175.png 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><figcaption id=\"caption-attachment-38077\" class=\"wp-caption-text\">Swap \u0111\u00e3 \u0111\u01b0\u1ee3c th\u00eam v\u00e0o 2GB dung l\u01b0\u1ee3ng<\/figcaption><\/figure>\n<p><strong>C\u00e1ch thi\u1ebft l\u1eadp Swap t\u1ef1 \u0111\u1ed9ng k\u00edch ho\u1ea1t khi kh\u1edfi \u0111\u1ed9ng<\/strong><\/p>\n<p>M\u1eb7c \u0111\u1ecbnh, sau khi reboot h\u1ec7 \u0111i\u1ec1u h\u00e0nh, swap file s\u1ebd kh\u00f4ng c\u00f2n \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t. \u0110\u1ec3 \u0111\u1ea3m b\u1ea3o swap lu\u00f4n ho\u1ea1t \u0111\u1ed9ng k\u1ec3 c\u1ea3 khi m\u00e1y ch\u1ee7 kh\u1edfi \u0111\u1ed9ng l\u1ea1i, b\u1ea1n c\u1ea7n ch\u1ec9nh s\u1eeda file \/etc\/fstab.<\/p>\n<p>Th\u00eam d\u00f2ng sau v\u00e0o cu\u1ed1i file:<\/p>\n<pre>  \/Swapfile Swap Swap sw 0 0<\/pre>\n<p>Thi\u1ebft l\u1eadp n\u00e0y gi\u00fap swap file \u0111\u01b0\u1ee3c mount t\u1ef1 \u0111\u1ed9ng m\u1ed7i khi h\u1ec7 \u0111i\u1ec1u h\u00e0nh kh\u1edfi \u0111\u1ed9ng.<\/p>\n<p><strong>C\u00e1ch t\u00f9y ch\u1ec9nh h\u1ec7 th\u1ed1ng s\u1eed d\u1ee5ng Swap hi\u1ec7u qu\u1ea3<\/strong><\/p>\n<p>\u0110\u1ec3 h\u1ec7 th\u1ed1ng s\u1eed d\u1ee5ng swap hi\u1ec7u qu\u1ea3 h\u01a1n, b\u1ea1n c\u1ea7n ch\u1ec9nh s\u1eeda file c\u1ea5u h\u00ecnh: \/etc\/sysctl.conf<\/p>\n<p>Th\u00eam c\u00e1c d\u00f2ng sau:<\/p>\n<pre>vm.Swappiness = 10\r\n\r\nvm.vfs_cache_pressure = 50<\/pre>\n<p>Sau \u0111\u00f3, kh\u1edfi \u0111\u1ed9ng l\u1ea1i h\u1ec7 \u0111i\u1ec1u h\u00e0nh \u0111\u1ec3 c\u00e1c thi\u1ebft l\u1eadp c\u00f3 hi\u1ec7u l\u1ef1c.<\/p>\n<p>B\u1ea1n c\u00f3 th\u1ec3 ki\u1ec3m tra l\u1ea1i ch\u1ec9 s\u1ed1 swappiness b\u1eb1ng l\u1ec7nh:<\/p>\n<pre>\u00a0cat \/proc\/sys\/vm\/swappiness<\/pre>\n<p><strong>Tham s\u1ed1 Swappiness l\u00e0 g\u00ec?<\/strong><\/p>\n<p>Swappiness l\u00e0 tham s\u1ed1 x\u00e1c \u0111\u1ecbnh <strong>th\u1eddi \u0111i\u1ec3m h\u1ec7 th\u1ed1ng chuy\u1ec3n t\u1eeb RAM sang s\u1eed d\u1ee5ng swap memory<\/strong>. Gi\u00e1 tr\u1ecb c\u1ee7a swappiness n\u1eb1m trong kho\u1ea3ng <strong>0\u2013100<\/strong>, v\u1edbi gi\u00e1 tr\u1ecb m\u1eb7c \u0111\u1ecbnh l\u00e0 <strong>30<\/strong>.<\/p>\n<ul>\n<li>Khi <strong>swappiness = 0<\/strong>: h\u1ec7 th\u1ed1ng g\u1ea7n nh\u01b0 <strong>kh\u00f4ng s\u1eed d\u1ee5ng swap<\/strong><\/li>\n<li>Khi <strong>swappiness = 100<\/strong>: h\u1ec7 th\u1ed1ng <strong>\u01b0u ti\u00ean s\u1eed d\u1ee5ng swap nhi\u1ec1u h\u01a1n<\/strong>, gi\u1eef RAM tr\u1ed1ng t\u1ed1i \u0111a<\/li>\n<li>Khi <strong>swappiness = 10<\/strong>: h\u1ec7 th\u1ed1ng ch\u1ec9 d\u00f9ng swap khi <strong>RAM c\u00f2n kho\u1ea3ng 10%<\/strong><\/li>\n<\/ul>\n<p>Do swap c\u00f3 t\u1ed1c \u0111\u1ed9 x\u1eed l\u00fd <strong>ch\u1eadm h\u01a1n RAM r\u1ea5t nhi\u1ec1u<\/strong>, b\u1ea1n <strong>kh\u00f4ng n\u00ean \u0111\u1ec3 h\u1ec7 th\u1ed1ng s\u1eed d\u1ee5ng swap qu\u00e1 th\u01b0\u1eddng xuy\u00ean<\/strong>. Trong h\u1ea7u h\u1ebft tr\u01b0\u1eddng h\u1ee3p, thi\u1ebft l\u1eadp <strong>swappiness = 10<\/strong> \u0111\u01b0\u1ee3c xem l\u00e0 m\u1ee9c h\u1ee3p l\u00fd.<\/p>\n<p>Sau khi ki\u1ec3m tra swappiness, b\u1ea1n c\u00f3 th\u1ec3 ti\u1ebfp t\u1ee5c ki\u1ec3m tra tham s\u1ed1 vfs_cache_pressure b\u1eb1ng l\u1ec7nh:<\/p>\n<pre>cat \/proc\/sys\/vm\/vfs_cache_pressure<\/pre>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-38076\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Cach-tao-Swap-Memory-tren-Ubuntu-CentOS-Linux.jpg\" alt=\"C\u00e1ch t\u1ea1o Swap Memory tr\u00ean Ubuntu &amp; CentOS Linux\" width=\"800\" height=\"500\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Cach-tao-Swap-Memory-tren-Ubuntu-CentOS-Linux.jpg 800w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Cach-tao-Swap-Memory-tren-Ubuntu-CentOS-Linux-300x188.jpg 300w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Cach-tao-Swap-Memory-tren-Ubuntu-CentOS-Linux-768x480.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/p>\n<p><strong>Tham s\u1ed1 Swap \u2013 vfs_cache_pressure l\u00e0 g\u00ec?<\/strong><\/p>\n<p>Tham s\u1ed1 <code>vfs_cache_pressure<\/code> \u1ea3nh h\u01b0\u1edfng tr\u1ef1c ti\u1ebfp \u0111\u1ebfn <strong>c\u00e1ch h\u1ec7 th\u1ed1ng l\u01b0u tr\u1eef metadata c\u1ee7a filesystem<\/strong>. Vi\u1ec7c li\u00ean t\u1ee5c \u0111\u1ecdc v\u00e0 l\u00e0m m\u1edbi metadata n\u00e0y ti\u00eau t\u1ed1n nhi\u1ec1u t\u00e0i nguy\u00ean, v\u00ec v\u1eady <strong>gi\u1eef ch\u00fang l\u00e2u h\u01a1n trong b\u1ed9 \u0111\u1ec7m s\u1ebd gi\u00fap c\u1ea3i thi\u1ec7n hi\u1ec7u n\u0103ng<\/strong>.<\/p>\n<p>Gi\u00e1 tr\u1ecb m\u1eb7c \u0111\u1ecbnh c\u1ee7a <code>vfs_cache_pressure<\/code> l\u00e0 <strong>100<\/strong>, ngh\u0129a l\u00e0 metadata s\u1ebd b\u1ecb x\u00f3a kh\u1ecfi cache kh\u00e1 nhanh. Do \u0111\u00f3, thi\u1ebft l\u1eadp gi\u00e1 tr\u1ecb <strong>50<\/strong> s\u1ebd gi\u00fap h\u1ec7 th\u1ed1ng l\u01b0u tr\u1eef metadata l\u00e2u h\u01a1n v\u00e0 ho\u1ea1t \u0111\u1ed9ng \u1ed5n \u0111\u1ecbnh h\u01a1n.<\/p>\n<p>Tr\u01b0\u1edbc khi ti\u1ebfn h\u00e0nh t\u1ea1o swap m\u1edbi, b\u1ea1n n\u00ean ki\u1ec3m tra xem m\u00e1y ch\u1ee7 \u0111\u00e3 c\u00f3 swap \u0111\u01b0\u1ee3c c\u1ea5u h\u00ecnh hay ch\u01b0a. Vi\u1ec7c n\u00e0y gi\u00fap tr\u00e1nh t\u1ea1o tr\u00f9ng ho\u1eb7c c\u1ea5u h\u00ecnh kh\u00f4ng c\u1ea7n thi\u1ebft.<\/p>\n<p>Ph\u1ea7n h\u01b0\u1edbng d\u1eabn tr\u00ean t\u1eadp trung v\u00e0o t\u1ea1o swap t\u1eeb swap file. Ngo\u00e0i ph\u01b0\u01a1ng ph\u00e1p n\u00e0y, b\u1ea1n c\u0169ng c\u00f3 th\u1ec3 t\u1ea1o swap t\u1eeb ph\u00e2n v\u00f9ng \u1ed5 \u0111\u0129a ri\u00eang, t\u00f9y theo nhu c\u1ea7u v\u00e0 c\u1ea5u h\u00ecnh h\u1ec7 th\u1ed1ng.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Nhung-luu-y-quan-trong-khi-su-dung-Swap-Memory\"><\/span>Nh\u1eefng l\u01b0u \u00fd quan tr\u1ecdng khi s\u1eed d\u1ee5ng Swap Memory<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u0110\u1ec3 s\u1eed d\u1ee5ng Swap hi\u1ec7u qu\u1ea3 v\u00e0 tr\u00e1nh c\u00e1c r\u1ee7i ro, b\u1ea1n c\u1ea7n ghi nh\u1edb nh\u1eefng nguy\u00ean t\u1eafc sau:<\/p>\n<ol>\n<li><strong>Kh\u00f4ng thay th\u1ebf RAM:<\/strong> \u0110\u1eebng bao gi\u1edd ngh\u0129 r\u1eb1ng t\u1ea1o 10GB Swap th\u00ec VPS 1GB RAM s\u1ebd ch\u1ea1y m\u1ea1nh nh\u01b0 VPS 11GB RAM. \u0110\u00f3 l\u00e0 sai l\u1ea7m tai h\u1ea1i.<\/li>\n<li><strong>Kh\u00f4ng \u0111\u1eb7t Swap qu\u00e1 l\u1edbn:<\/strong> \u0110\u1eb7t Swap qu\u00e1 l\u1edbn tr\u00ean m\u1ed9t h\u1ec7 th\u1ed1ng thi\u1ebfu RAM tr\u1ea7m tr\u1ecdng ch\u1ec9 khi\u1ebfn h\u1ec7 th\u1ed1ng m\u1ea5t nhi\u1ec1u th\u1eddi gian h\u01a1n \u0111\u1ec3 ph\u1ee5c h\u1ed3i khi b\u1ecb treo (do ph\u1ea3i \u0111\u1ecdc m\u1ed9t l\u01b0\u1ee3ng l\u1edbn d\u1eef li\u1ec7u t\u1eeb \u1ed5 c\u1ee9ng ch\u1eadm ch\u1ea1p).<\/li>\n<li><strong>Theo d\u00f5i Swap Usage:<\/strong> S\u1eed d\u1ee5ng l\u1ec7nh free -m ho\u1eb7c htop th\u01b0\u1eddng xuy\u00ean. N\u1ebfu <strong>l\u01b0u \u00fd khi d\u00f9ng swap<\/strong> th\u1ea5y Swap lu\u00f4n \u0111\u1ea7y &gt; 80%, b\u1ea1n c\u1ea7n n\u00e2ng c\u1ea5p VPS ngay.<\/li>\n<li><strong>\u0110i\u1ec1u ch\u1ec9nh Swappiness:<\/strong> Lu\u00f4n nh\u1edb ki\u1ec3m tra v\u00e0 h\u1ea1 th\u1ea5p ch\u1ec9 s\u1ed1 n\u00e0y sau khi c\u00e0i \u0111\u1eb7t VPS m\u1edbi.<\/li>\n<\/ol>\n<p>C\u00e2u h\u1ecfi <strong>swap cao c\u00f3 sao kh\u00f4ng<\/strong>? C\u00f3, n\u00f3 b\u00e1o hi\u1ec7u h\u1ec7 th\u1ed1ng \u0111ang qu\u00e1 t\u1ea3i v\u00e0 tr\u1ea3i nghi\u1ec7m ng\u01b0\u1eddi d\u00f9ng \u0111ang b\u1ecb \u1ea3nh h\u01b0\u1edfng ti\u00eau c\u1ef1c.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Cau-hoi-thuong-gap-FAQs\"><\/span>C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p (FAQs)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>D\u01b0\u1edbi \u0111\u00e2y l\u00e0 gi\u1ea3i \u0111\u00e1p cho nh\u1eefng th\u1eafc m\u1eafc th\u01b0\u1eddng g\u1eb7p nh\u1ea5t v\u1ec1 Swap:<\/p>\n<p><strong>1. C\u00f3 n\u00ean d\u00f9ng Swap tr\u00ean \u1ed5 c\u1ee9ng SSD kh\u00f4ng?<\/strong><\/p>\n<p>C\u00f3, nh\u01b0ng c\u1ea7n c\u1ea5u h\u00ecnh Swappiness th\u1ea5p (v\u00ed d\u1ee5: 10). \u1ed4 c\u1ee9ng SSD hi\u1ec7n \u0111\u1ea1i c\u00f3 tu\u1ed5i th\u1ecd ghi (TBW) r\u1ea5t cao, vi\u1ec7c s\u1eed d\u1ee5ng Swap \u1edf m\u1ee9c \u0111\u1ed9 v\u1eeba ph\u1ea3i kh\u00f4ng g\u00e2y h\u1ecfng \u1ed5 c\u1ee9ng nhanh nh\u01b0 l\u1eddi \u0111\u1ed3n. L\u1ee3i \u00edch v\u1ec1 t\u1ed1c \u0111\u1ed9 m\u00e0 SSD mang l\u1ea1i cho Swap v\u01b0\u1ee3t xa r\u1ee7i ro hao m\u00f2n.<\/p>\n<p><strong>2. L\u00e0m sao \u0111\u1ec3 x\u00f3a ho\u1eb7c thay \u0111\u1ed5i dung l\u01b0\u1ee3ng Swap File?<\/strong><\/p>\n<p>B\u1ea1n c\u1ea7n t\u1eaft Swap b\u1eb1ng l\u1ec7nh swapoff, sau \u0111\u00f3 x\u00f3a file c\u0169, t\u1ea1o file m\u1edbi v\u1edbi dung l\u01b0\u1ee3ng mong mu\u1ed1n v\u00e0 k\u00edch ho\u1ea1t l\u1ea1i b\u1eb1ng swapon.<\/p>\n<p><strong>3. T\u1ea1i sao c\u00f3 Swap nh\u01b0ng VPS v\u1eabn b\u1ecb lag?<\/strong><\/p>\n<p>V\u00ec t\u1ed1c \u0111\u1ed9 \u1ed5 c\u1ee9ng qu\u00e1 ch\u1eadm so v\u1edbi nhu c\u1ea7u x\u1eed l\u00fd c\u1ee7a CPU. Swap ch\u1ec9 gi\u00fap \u1ee9ng d\u1ee5ng kh\u00f4ng b\u1ecb crash, ch\u1ee9 kh\u00f4ng gi\u00fap n\u00f3 ch\u1ea1y nhanh h\u01a1n. B\u1ea1n c\u1ea7n ki\u1ec3m tra l\u1ea1i xem ti\u1ebfn tr\u00ecnh n\u00e0o \u0111ang &#8220;ng\u1ed1n&#8221; t\u00e0i nguy\u00ean.<\/p>\n<p><strong>4. Swap File v\u00e0 Swap Partition c\u00e1i n\u00e0o t\u1ed1t h\u01a1n cho VPS?<\/strong><\/p>\n<p>Tr\u00ean m\u00f4i tr\u01b0\u1eddng VPS, Swap File t\u1ed1t h\u01a1n v\u00ec t\u00ednh linh ho\u1ea1t, d\u1ec5 d\u00e0ng thay \u0111\u1ed5i dung l\u01b0\u1ee3ng (Resize) m\u00e0 kh\u00f4ng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u1ea5u tr\u00fac ph\u00e2n v\u00f9ng \u1ed5 \u0111\u0129a. Hi\u1ec7u n\u0103ng gi\u1eefa hai lo\u1ea1i n\u00e0y tr\u00ean c\u00e1c h\u1ec7 th\u1ed1ng hi\u1ec7n \u0111\u1ea1i l\u00e0 g\u1ea7n nh\u01b0 t\u01b0\u01a1ng \u0111\u01b0\u01a1ng.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Ket-luan\"><\/span>K\u1ebft lu\u1eadn<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Swap Memory l\u00e0 m\u1ed9t th\u00e0nh ph\u1ea7n kh\u00f4ng th\u1ec3 thi\u1ebfu trong ki\u1ebfn tr\u00fac qu\u1ea3n l\u00fd b\u1ed9 nh\u1edb c\u1ee7a Linux, \u0111\u00f3ng vai tr\u00f2 nh\u01b0 m\u1ed9t &#8220;b\u00ecnh oxy&#8221; d\u1ef1 ph\u00f2ng gi\u00fap h\u1ec7 th\u1ed1ng duy tr\u00ec s\u1ef1 s\u1ed1ng trong nh\u1eefng th\u1eddi \u0111i\u1ec3m t\u1ea3i cao. Tuy nhi\u00ean, Swap kh\u00f4ng ph\u1ea3i l\u00e0 th\u1ea7n d\u01b0\u1ee3c \u0111\u1ec3 bi\u1ebfn m\u1ed9t VPS y\u1ebfu th\u00e0nh si\u00eau m\u00e1y t\u00ednh.<\/p>\n<p>Qua b\u00e0i vi\u1ebft n\u00e0y, hy v\u1ecdng b\u1ea1n \u0111\u00e3 hi\u1ec3u r\u00f5 <strong>Swap memory l\u00e0 g\u00ec<\/strong>, c\u00e1ch t\u00ednh to\u00e1n dung l\u01b0\u1ee3ng ph\u00f9 h\u1ee3p v\u00e0 c\u00e1c ph\u01b0\u01a1ng ph\u00e1p t\u1ed1i \u01b0u hi\u1ec7u n\u0103ng. H\u00e3y s\u1eed d\u1ee5ng Swap m\u1ed9t c\u00e1ch th\u00f4ng minh: c\u1ea5u h\u00ecnh \u0111\u1ee7 d\u00f9ng, t\u1ed1i \u01b0u Swappiness v\u00e0 lu\u00f4n coi tr\u1ecdng vi\u1ec7c n\u00e2ng c\u1ea5p RAM v\u1eadt l\u00fd khi nhu c\u1ea7u th\u1ef1c t\u1ebf \u0111\u00f2i h\u1ecfi.<\/p>\n<p>N\u1ebfu b\u1ea1n g\u1eb7p b\u1ea5t k\u1ef3 kh\u00f3 kh\u0103n n\u00e0o trong vi\u1ec7c c\u1ea5u h\u00ecnh Swap ho\u1eb7c c\u1ea7n t\u01b0 v\u1ea5n gi\u1ea3i ph\u00e1p VPS ph\u00f9 h\u1ee3p, \u0111\u1eebng ng\u1ea7n ng\u1ea1i li\u00ean h\u1ec7 v\u1edbi \u0111\u1ed9i ng\u0169 k\u1ef9 thu\u1eadt c\u1ee7a <a href=\"https:\/\/interdata.vn\/\"><strong>InterData<\/strong> <\/a>ho\u1eb7c \u0111\u1ec3 l\u1ea1i b\u00ecnh lu\u1eadn b\u00ean d\u01b0\u1edbi \u0111\u1ec3 \u0111\u01b0\u1ee3c h\u1ed7 tr\u1ee3.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Trong qu\u00e1 tr\u00ecnh v\u1eadn h\u00e0nh m\u00e1y ch\u1ee7 \u1ea3o (VPS) ho\u1eb7c m\u00e1y ch\u1ee7 ri\u00eang (Dedicated Server), m\u1ed9t trong nh\u1eefng v\u1ea5n \u0111\u1ec1 k\u1ef9 thu\u1eadt ph\u1ed5 bi\u1ebfn nh\u1ea5t m\u00e0 qu\u1ea3n tr\u1ecb vi\u00ean g\u1eb7p ph\u1ea3i l\u00e0 t\u00ecnh tr\u1ea1ng \u0111\u1ea7y b\u1ed9 nh\u1edb RAM (Full RAM). Khi t\u00e0i nguy\u00ean RAM v\u1eadt l\u00fd b\u1ecb c\u1ea1n ki\u1ec7t, h\u1ec7 th\u1ed1ng s\u1ebd tr\u1edf n\u00ean ch\u1eadm<\/p>\n","protected":false},"author":11,"featured_media":38079,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[49],"tags":[],"class_list":["post-38060","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-vps"],"_links":{"self":[{"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/posts\/38060","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/comments?post=38060"}],"version-history":[{"count":2,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/posts\/38060\/revisions"}],"predecessor-version":[{"id":38080,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/posts\/38060\/revisions\/38080"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/media\/38079"}],"wp:attachment":[{"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/media?parent=38060"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/categories?post=38060"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/tags?post=38060"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}