{"id":2926,"date":"2026-02-03T21:02:45","date_gmt":"2026-02-04T00:02:45","guid":{"rendered":"https:\/\/helpsysadmin.com.br\/blog\/?p=2926"},"modified":"2026-02-03T21:03:35","modified_gmt":"2026-02-04T00:03:35","slug":"overselling-vps","status":"publish","type":"post","link":"https:\/\/helpsysadmin.com.br\/blog\/overselling-vps\/","title":{"rendered":"Como detectar overselling em VPS"},"content":{"rendered":"<div id=\"helps-3939264800\" 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\">Overselling em VPS \u00e9 aquele cl\u00e1ssico <strong>\u201co provedor prometeu mais do que o host f\u00edsico aguenta\u201d<\/strong> \u2014 e quem paga a conta \u00e9 voc\u00ea, com lentid\u00e3o aleat\u00f3ria, picos de lat\u00eancia e performance inconsistente.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Vamos ao que interessa: <strong>como detectar isso na pr\u00e1tica<\/strong>, sem achismo.<\/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-sintomas-classicos-de-overselling\">1\ufe0f\u20e3 Sintomas cl\u00e1ssicos de overselling<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Antes de medir, observe o comportamento:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>CPU \u201clivre\u201d, mas tudo demora<\/li>\n\n\n\n<li>Load average alto <strong>sem uso real de CPU<\/strong><\/li>\n\n\n\n<li>MySQL lento s\u00f3 em hor\u00e1rios espec\u00edficos<\/li>\n\n\n\n<li>I\/O travando mesmo com disco \u201cr\u00e1pido\u201d<\/li>\n\n\n\n<li>Picos de lat\u00eancia sem motivo aparente<\/li>\n\n\n\n<li>Performance boa de madrugada, ruim de dia<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Se isso soa familiar\u2026 alerta ligado \ud83d\udea8<\/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-2-cpu-roubando-seu-tempo-sem-avisar\">2\ufe0f\u20e3 CPU: roubando seu tempo sem avisar<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-verifique-cpu-steal-time\">\ud83d\udd0d Verifique CPU steal time<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Esse \u00e9 o <strong>principal indicador de overselling<\/strong>.<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>top\n<\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Procure por:<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>%Cpu(s): ... st\n<\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Ou mais preciso:<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>mpstat -P ALL 1\n<\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udccc <strong>Interpreta\u00e7\u00e3o<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>st<\/code> > <strong>2% constante<\/strong> \u2192 suspeito<\/li>\n\n\n\n<li><code>st<\/code> > <strong>5\u201310% frequente<\/strong> \u2192 overselling claro<\/li>\n\n\n\n<li><code>st<\/code> alto + CPU ociosa \u2192 host saturado<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udc49 <em>Steal time = tempo que a sua VPS queria CPU, mas o hypervisor n\u00e3o entregou.<\/em><\/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-3-load-alto-com-cpu-baixa-classico\">3\ufe0f\u20e3 Load alto com CPU baixa (cl\u00e1ssico)<\/h2>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>uptime\n<\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Exemplo ruim:<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>load average: 8.2, 7.9, 7.5\n<\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Mas CPU:<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>top\n<\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Mostra:<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>90% idle\n<\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udccc Isso <strong>n\u00e3o \u00e9 aplica\u00e7\u00e3o mal otimizada<\/strong>.<br>\u00c9 CPU disputada no host f\u00edsico.<\/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-4-disco-onde-o-overselling-mais-doi\">4\ufe0f\u20e3 Disco: onde o overselling mais d\u00f3i<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-teste-simples-de-i-o\">Teste simples de I\/O<\/h3>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>iostat -xz 1\n<\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Observe:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>await<\/code> acima de <strong>20\u201330ms<\/strong><\/li>\n\n\n\n<li><code>svctm<\/code> inst\u00e1vel<\/li>\n\n\n\n<li><code>%util<\/code> sempre perto de 100%<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Ou teste direto:<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>dd if=\/dev\/zero of=test.img bs=1G count=1 oflag=direct\n<\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Resultados t\u00edpicos:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Prometeram NVMe \u2192 entrega &lt; 100 MB\/s \ud83d\ude2c<\/li>\n\n\n\n<li>Performance varia muito entre execu\u00e7\u00f5es<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udccc Overselling de I\/O \u00e9 o mais comum e o mais destrutivo.<\/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-5-rede-inconsistente-menos-comum-mas-existe\">5\ufe0f\u20e3 Rede inconsistente (menos comum, mas existe)<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Teste lat\u00eancia cont\u00ednua:<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>ping -i 0.2 8.8.8.8\n<\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Se:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Lat\u00eancia varia demais<\/li>\n\n\n\n<li>Picos sem tr\u00e1fego<\/li>\n\n\n\n<li>Packet loss ocasional<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udc49 Pode ser overselling de uplink ou congestionamento interno.<\/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-6-compare-com-vps-limpa-teste-a-b\">6\ufe0f\u20e3 Compare com VPS \u201climpa\u201d (teste A\/B)<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A melhor prova:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Suba <strong>outra VPS<\/strong> (mesmo plano, outro provedor)<\/li>\n\n\n\n<li>Rode <strong>os mesmos testes<\/strong><\/li>\n\n\n\n<li>Compare:\n<ul class=\"wp-block-list\">\n<li>CPU steal<\/li>\n\n\n\n<li>I\/O<\/li>\n\n\n\n<li>Load vs CPU<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Diferen\u00e7a gritante = prova concreta.<\/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-7-overselling-x-limitacao-contratual-nao-confunda\">7\ufe0f\u20e3 Overselling x Limita\u00e7\u00e3o contratual (n\u00e3o confunda)<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u26a0\ufe0f Nem tudo \u00e9 overselling:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Situa\u00e7\u00e3o<\/th><th>\u00c9 overselling?<\/th><\/tr><\/thead><tbody><tr><td>CPU limitada por cgroup<\/td><td>\u274c<\/td><\/tr><tr><td>Burst CPU acabou<\/td><td>\u274c<\/td><\/tr><tr><td>Disco lento, mas est\u00e1vel<\/td><td>\u274c<\/td><\/tr><tr><td>Performance vari\u00e1vel e imprevis\u00edvel<\/td><td>\u2705<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Overselling = <strong>inconsist\u00eancia<\/strong>, n\u00e3o s\u00f3 limite.<\/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-8-o-que-nao-resolve\">8\ufe0f\u20e3 O que N\u00c3O resolve<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u274c Tunar kernel<br>\u274c Ajustar sysctl<br>\u274c Otimizar MySQL infinitamente<br>\u274c Trocar PHP 8.1 \u2192 8.3 esperando milagre<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udc49 Se o host est\u00e1 saturado, <strong>n\u00e3o existe tuning que salve<\/strong>.<\/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-9-como-confirmar-de-vez\">9\ufe0f\u20e3 Como confirmar de vez<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Checklist final:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>CPU steal > 5%<\/li>\n\n\n\n<li>Load alto com CPU idle<\/li>\n\n\n\n<li>I\/O inconsistente<\/li>\n\n\n\n<li>Performance varia por hor\u00e1rio<\/li>\n\n\n\n<li>Mesmo stack roda melhor em outro VPS<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Se marcou 3 ou mais \u2192 <strong>overselling confirmado<\/strong> \u2705<\/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-10-o-que-fazer-quando-detecta-overselling\">10\ufe0f\u20e3 O que fazer quando detecta overselling<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Abrir ticket pedindo <strong>migra\u00e7\u00e3o de host<\/strong><\/li>\n\n\n\n<li>Pedir m\u00e9tricas do n\u00f3 f\u00edsico<\/li>\n\n\n\n<li>Migrar para plano:\n<ul class=\"wp-block-list\">\n<li>CPU dedicada<\/li>\n\n\n\n<li>NVMe garantido<\/li>\n\n\n\n<li>Limite de tenants por host<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Ou\u2026 <strong>trocar de provedor<\/strong><\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>Overselling em VPS \u00e9 aquele cl\u00e1ssico \u201co provedor prometeu mais do que o host f\u00edsico aguenta\u201d \u2014 e quem paga a conta [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":2927,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9,1279,1921],"tags":[2718,2724,2712,2720,2722,2714,2716,2310,209],"class_list":["post-2926","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-gerenciamento-servidor","category-linux","category-rede","tag-cpu-steal","tag-diagnostico-de-servidor","tag-infraestrutura","tag-io-disco","tag-linux-server-6","tag-overselling","tag-performance-de-servidor-2","tag-sysadmin","tag-vps"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.9 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