{"id":3020,"date":"2026-02-04T07:09:21","date_gmt":"2026-02-04T10:09:21","guid":{"rendered":"https:\/\/helpsysadmin.com.br\/blog\/?p=3020"},"modified":"2026-02-04T07:09:24","modified_gmt":"2026-02-04T10:09:24","slug":"cache-disco-linux","status":"publish","type":"post","link":"https:\/\/helpsysadmin.com.br\/blog\/cache-disco-linux\/","title":{"rendered":"Cache de Disco no Linux: Como Funciona e Impacta a Performance"},"content":{"rendered":"<div id=\"helps-3534330281\" class=\"helps-before-content-2 helps-entity-placement\"><script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-3661896953164277\"\r\n     crossorigin=\"anonymous\"><\/script>\r\n<!-- 2anuncios display quadrado -->\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block\"\r\n     data-ad-client=\"ca-pub-3661896953164277\"\r\n     data-ad-slot=\"5051229894\"\r\n     data-ad-format=\"auto\"\r\n     data-full-width-responsive=\"true\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script><\/div>\n<p class=\"wp-block-paragraph\">Cache de disco <a href=\"https:\/\/helpsysadmin.com.br\/blog\/como-instalar-crowdsec\/\" data-internallinksmanager029f6b8e52c=\"1\" title=\"Como instalar Crowdsec\" target=\"_blank\" rel=\"noopener\">Linux<\/a>. Vamos falar sobre <strong>cache de disco no Linux<\/strong>, de forma detalhada e pr\u00e1tica, porque \u00e9 um dos temas mais importantes para entender desempenho de servidores e sistemas de arquivos.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-1-o-que-e-cache-de-disco-no-linux\">1\ufe0f\u20e3 O que \u00e9 cache de disco no Linux<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">O <strong>cache de disco<\/strong> (ou <strong>page cache<\/strong>) \u00e9 uma camada de mem\u00f3ria RAM usada pelo Linux para armazenar dados lidos ou escritos recentemente no disco. Ele serve para <strong>acelerar opera\u00e7\u00f5es de I\/O<\/strong> sem precisar ir ao disco f\u00edsico toda hora.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Quando voc\u00ea l\u00ea um arquivo, o Linux tenta servir os dados do <strong>cache em RAM<\/strong> em vez do disco.<\/li>\n\n\n\n<li>Quando voc\u00ea escreve, o Linux pode primeiro colocar os dados no cache e escrever depois no disco (<strong>write-back<\/strong>), melhorando performance.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-2-como-o-linux-organiza-o-cache\">2\ufe0f\u20e3 Como o Linux organiza o cache<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">O Linux usa a mem\u00f3ria RAM de forma agressiva para cache, mas <strong>n\u00e3o compromete o sistema<\/strong>. Ele mant\u00e9m tr\u00eas categorias principais:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Page cache<\/strong> \u2013 armazena blocos de arquivos lidos do disco.<\/li>\n\n\n\n<li><strong>Buffer cache<\/strong> \u2013 usado para metadados de sistema de arquivos, como inodes e tabelas de diret\u00f3rios.<\/li>\n\n\n\n<li><strong>Swap cache<\/strong> \u2013 p\u00e1ginas que foram para swap, mas ainda podem estar em RAM.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">Voc\u00ea pode visualizar a mem\u00f3ria de cache com:<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>free -h\n<\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Exemplo de sa\u00edda:<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>              total        used        free      shared  buff\/cache   available\nMem:           15G         8G         1G         0G         6G         6G\nSwap:          2G         0G         2G\n<\/pre><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>buff\/cache<\/strong> mostra quanto de RAM est\u00e1 sendo usado para cache de disco e buffers.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Tamb\u00e9m \u00e9 poss\u00edvel usar:<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>cat \/proc\/meminfo | grep -E 'Cached|Buffers|SwapCached'\n<\/pre><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-3-tipos-de-escrita\">3\ufe0f\u20e3 Tipos de escrita<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">O Linux tem dois modos de escrita que afetam o cache:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Write-back (padr\u00e3o)<\/strong>\n<ul class=\"wp-block-list\">\n<li>Dados v\u00e3o para o cache primeiro, depois s\u00e3o gravados no disco em segundo plano.<\/li>\n\n\n\n<li>Mais r\u00e1pido, mas existe risco de perda de dados se o sistema travar antes do flush.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Write-through<\/strong>\n<ul class=\"wp-block-list\">\n<li>Dados v\u00e3o direto para o disco, sem ficar s\u00f3 em cache.<\/li>\n\n\n\n<li>Mais seguro, mas mais lento.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-4-comandos-importantes\">4\ufe0f\u20e3 Comandos importantes<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Limpar cache<\/strong> (\u00fatil para testes de desempenho, n\u00e3o para uso normal):<\/li>\n<\/ul>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre># Limpar cache de p\u00e1gina, dentries e inodes\nsudo sync; sudo echo 3 &gt; \/proc\/sys\/vm\/drop_caches\n<\/pre><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Ver estat\u00edsticas do cache de disco<\/strong>:<\/li>\n<\/ul>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>vmstat -s | grep &quot;cache&quot;\n<\/pre><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>For\u00e7ar flush de dados pendentes no disco<\/strong>:<\/li>\n<\/ul>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>sudo sync\n<\/pre><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-5-cache-e-desempenho\">5\ufe0f\u20e3 Cache e desempenho<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Cache de disco ajuda muito em <strong>leituras repetidas<\/strong>.<\/li>\n\n\n\n<li>Sistemas de banco de dados ou aplica\u00e7\u00f5es I\/O intensivas podem se beneficiar do ajuste do cache.<\/li>\n\n\n\n<li>Par\u00e2metros importantes em <code>\/proc\/sys\/vm\/<\/code>:<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Par\u00e2metro<\/th><th>O que faz<\/th><\/tr><\/thead><tbody><tr><td><code>vm.swappiness<\/code><\/td><td>Determina quando usar swap vs RAM\/cache<\/td><\/tr><tr><td><code>vm.vfs_cache_pressure<\/code><\/td><td>Controla limpeza de cache de metadados<\/td><\/tr><tr><td><code>dirty_ratio<\/code> \/ <code>dirty_background_ratio<\/code><\/td><td>Quando o kernel escreve dados sujos do cache para o disco<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Exemplo de ajuste agressivo de cache:<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre># Diminuir a press\u00e3o para limpar cache de metadados\nsudo sysctl -w vm.vfs_cache_pressure=50\n\n# Flush autom\u00e1tico mais cedo para evitar spikes\nsudo sysctl -w vm.dirty_ratio=15\nsudo sysctl -w vm.dirty_background_ratio=5\n<\/pre><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-6-observacoes-importantes\">6\ufe0f\u20e3 Observa\u00e7\u00f5es importantes<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Cache n\u00e3o \u00e9 mem\u00f3ria perdida<\/strong>: Linux libera RAM de cache automaticamente quando algum processo precisa de mem\u00f3ria.<\/li>\n\n\n\n<li><strong>N\u00e3o confunda cache com swap<\/strong>: swap \u00e9 usado quando a RAM realmente falta, cache \u00e9 apenas otimiza\u00e7\u00e3o.<\/li>\n\n\n\n<li><strong>Cache de disco \u00e9 cr\u00edtico para performance de I\/O<\/strong>: em servidores web, bancos de dados e sistemas de arquivos grandes, ele pode fazer diferen\u00e7a enorme.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-large\"><img data-opt-id=1076865635  fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/mlkpd8g42nae.i.optimole.com\/w:1024\/h:683\/q:mauto\/f:best\/https:\/\/helpsysadmin.com.br\/blog\/wp-content\/uploads\/2026\/02\/cache_na_memoria_ram.png\" alt=\"\" class=\"wp-image-3024\" srcset=\"https:\/\/mlkpd8g42nae.i.optimole.com\/w:1024\/h:683\/q:mauto\/f:best\/https:\/\/helpsysadmin.com.br\/blog\/wp-content\/uploads\/2026\/02\/cache_na_memoria_ram.png 1024w, https:\/\/mlkpd8g42nae.i.optimole.com\/w:300\/h:200\/q:mauto\/f:best\/https:\/\/helpsysadmin.com.br\/blog\/wp-content\/uploads\/2026\/02\/cache_na_memoria_ram.png 300w, https:\/\/mlkpd8g42nae.i.optimole.com\/w:768\/h:512\/q:mauto\/f:best\/https:\/\/helpsysadmin.com.br\/blog\/wp-content\/uploads\/2026\/02\/cache_na_memoria_ram.png 768w, https:\/\/mlkpd8g42nae.i.optimole.com\/w:1000\/h:667\/q:mauto\/f:best\/https:\/\/helpsysadmin.com.br\/blog\/wp-content\/uploads\/2026\/02\/cache_na_memoria_ram.png 1000w, https:\/\/mlkpd8g42nae.i.optimole.com\/w:230\/h:153\/q:mauto\/f:best\/https:\/\/helpsysadmin.com.br\/blog\/wp-content\/uploads\/2026\/02\/cache_na_memoria_ram.png 230w, https:\/\/mlkpd8g42nae.i.optimole.com\/w:350\/h:233\/q:mauto\/f:best\/https:\/\/helpsysadmin.com.br\/blog\/wp-content\/uploads\/2026\/02\/cache_na_memoria_ram.png 350w, https:\/\/mlkpd8g42nae.i.optimole.com\/w:480\/h:320\/q:mauto\/f:best\/https:\/\/helpsysadmin.com.br\/blog\/wp-content\/uploads\/2026\/02\/cache_na_memoria_ram.png 480w, https:\/\/mlkpd8g42nae.i.optimole.com\/w:1536\/h:1024\/q:mauto\/f:best\/https:\/\/helpsysadmin.com.br\/blog\/wp-content\/uploads\/2026\/02\/cache_na_memoria_ram.png 1536w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Cache de disco Linux. Vamos falar sobre cache de disco no Linux, de forma detalhada e pr\u00e1tica, porque \u00e9 um dos temas [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":3025,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-3020","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-nao-categorizado"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.9 (Yoast SEO v27.9) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Cache de Disco no Linux: Como Funciona e Impacta a Performance<\/title>\n<meta name=\"description\" content=\"Entenda o que \u00e9 o cache de disco no Linux, como funciona o page cache, buffer cache e swap cache, e como ele melhora a performance de leitura e escrita\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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