{"id":729,"date":"2011-02-23T16:15:26","date_gmt":"2011-02-23T14:15:26","guid":{"rendered":"http:\/\/www.netexpertise.eu\/en\/?p=729"},"modified":"2021-10-10T22:33:47","modified_gmt":"2021-10-10T20:33:47","slug":"msa-2012i-san-performance-windows-vs-linux","status":"publish","type":"post","link":"http:\/\/www.netexpertise.eu\/en\/storage\/msa-2012i-san-performance-windows-vs-linux.html","title":{"rendered":"MSA 2012i SAN Performance Windows vs Linux"},"content":{"rendered":"<div style=\"float:left; margin-right:15px; margin-top:0px;\">\n<script async=\"\" src=\"\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script><br \/>\n<!-- 200x200, Netexpertise --><br \/>\n<ins class=\"adsbygoogle\" style=\"display:inline-block;width:200px;height:200px\" data-ad-client=\"ca-pub-6495750100906580\" data-ad-slot=\"1946825373\"><\/ins><br \/>\n<script><br \/>\n(adsbygoogle = window.adsbygoogle || []).push({});<br \/>\n<\/script><\/div>\n<p>I&#8217;ve noticed backups are getting slower and slower over time going from 500 to 2500MB\/min throughput.<br \/>\nI run backups on 2 dedicated RAID0 disks hosted on a iSCSI MSA array first, and duplicate them on tapes. Since I want to use the same array for a new database project, I want to measure and tune access to SAN disks from Windows 2003 Server and Linux Redhat 5.<br \/>\n&nbsp;<\/p>\n<h3>Environment<\/h3>\n<p>4 disks have been set up in a RAID 10 set.<br \/>\nAll interfaces are forced in 1G speed on the SAN and the server side.<br \/>\nServers are connected on to the SAN via 2 interfaces in a load-balanced modethat gives a max theorical throughput of 250MB\/s (a bit less considering frame headers).<br \/>\nJumboframes have been disabled, they&#8217;re not supported on the switches I&#8217;m using in this setup. They could give slightly better performance.<br \/>\nI also tuned the read ahead cache but I got no significant improvement.<br \/>\n&nbsp;<\/p>\n<h3>Results<\/h3>\n<p>The tests were conducted with a simple dd on Linux and Diskbench on Windows.<br \/>\n&nbsp;<\/p>\n<pre>Reads\t\tMB\/s\tIO\/s\nWindows\t\t70\t1100\nLinux\t\t110\t900\n\nWrites\t\tMB\/s\tIO\/s\nWindows\t\t140\t2100\nLinux\t\t140\t400\n<\/pre>\n<p>&nbsp;<\/p>\n<h3>Optimizations<\/h3>\n<p>There was no optimization whatsoever on the Linux platform. The partition was formatted with default ext3 filesystem on a LVM volume.<br \/>\nOn the Windows side, there was no fragmentation since we started off with a brand new drive. Fragmentation degrades performance indeed. The disk is formatted in NTFS with default 4k clusters: Increasing the cluster size does not seem to be of much impact.<br \/>\nThe partition has been <a href=\"http:\/\/support.microsoft.com\/kb\/929491\/en-us\">aligned<\/a> with the physical disk in diskpart to correct Windows 2003 Server caveat. This led a 5MB\/s increase in the maximum disk throughput.<br \/>\n&nbsp;<\/p>\n<h3>Then?<\/h3>\n<p>2 questions:<br \/>\nWhy the HP MSA 2012i writes faster than reads!? Write cache?<br \/>\n&nbsp;<br \/>\nWhy Windows read operations maximum bandwidth gets stuck to 70M?<br \/>\nThroughput was roughly improved by 5M with above Windows optimizations but we seem to now reach a cap limit. I get the same results with whichever RAID0, RAID5 or RAID10!!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>I&#8217;ve noticed backups are getting slower and slower over time going from 500 to 2500MB\/min throughput. I run backups on 2 dedicated RAID0 disks hosted on a iSCSI MSA array first, and duplicate them on tapes. Since I want to use the same array for a new database project, I want to measure and tune [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0},"categories":[313],"tags":[288,268,386,27,76,323,399,391],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.8.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Netexpertise - MSA 2012i SAN Performance Windows vs Linux<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"http:\/\/www.netexpertise.eu\/en\/storage\/msa-2012i-san-performance-windows-vs-linux.html\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Netexpertise - MSA 2012i SAN Performance Windows vs Linux\" \/>\n<meta property=\"og:description\" content=\"I&#8217;ve noticed backups are getting slower and slower over time going from 500 to 2500MB\/min throughput. I run backups on 2 dedicated RAID0 disks hosted on a iSCSI MSA array first, and duplicate them on tapes. Since I want to use the same array for a new database project, I want to measure and tune [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"http:\/\/www.netexpertise.eu\/en\/storage\/msa-2012i-san-performance-windows-vs-linux.html\" \/>\n<meta property=\"og:site_name\" content=\"Netexpertise\" \/>\n<meta property=\"article:published_time\" content=\"2011-02-23T14:15:26+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2021-10-10T20:33:47+00:00\" \/>\n<meta name=\"author\" content=\"dave\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@netexpertise\" \/>\n<meta name=\"twitter:site\" content=\"@netexpertise\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"http:\/\/www.netexpertise.eu\/en\/storage\/msa-2012i-san-performance-windows-vs-linux.html\",\"url\":\"http:\/\/www.netexpertise.eu\/en\/storage\/msa-2012i-san-performance-windows-vs-linux.html\",\"name\":\"Netexpertise - MSA 2012i SAN Performance Windows vs Linux\",\"isPartOf\":{\"@id\":\"https:\/\/www.netexpertise.eu\/en\/#website\"},\"datePublished\":\"2011-02-23T14:15:26+00:00\",\"dateModified\":\"2021-10-10T20:33:47+00:00\",\"author\":{\"@id\":\"https:\/\/www.netexpertise.eu\/en\/#\/schema\/person\/cb4cd666549d22e9070ec1cfc1a496fa\"},\"breadcrumb\":{\"@id\":\"http:\/\/www.netexpertise.eu\/en\/storage\/msa-2012i-san-performance-windows-vs-linux.html#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"http:\/\/www.netexpertise.eu\/en\/storage\/msa-2012i-san-performance-windows-vs-linux.html\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"http:\/\/www.netexpertise.eu\/en\/storage\/msa-2012i-san-performance-windows-vs-linux.html#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/www.netexpertise.eu\/en\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"MSA 2012i SAN Performance Windows vs Linux\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.netexpertise.eu\/en\/#website\",\"url\":\"https:\/\/www.netexpertise.eu\/en\/\",\"name\":\"Netexpertise\",\"description\":\"Systems \/ Networks \/ DevOps\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.netexpertise.eu\/en\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"en-US\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/www.netexpertise.eu\/en\/#\/schema\/person\/cb4cd666549d22e9070ec1cfc1a496fa\",\"name\":\"dave\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/www.netexpertise.eu\/en\/#\/schema\/person\/image\/\",\"url\":\"http:\/\/1.gravatar.com\/avatar\/1129916e1f4955bd632f27f836f64e55?s=96&d=mm&r=g\",\"contentUrl\":\"http:\/\/1.gravatar.com\/avatar\/1129916e1f4955bd632f27f836f64e55?s=96&d=mm&r=g\",\"caption\":\"dave\"},\"sameAs\":[\"http:\/\/www.netexpertise.eu\"]}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Netexpertise - MSA 2012i SAN Performance Windows vs Linux","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"http:\/\/www.netexpertise.eu\/en\/storage\/msa-2012i-san-performance-windows-vs-linux.html","og_locale":"en_US","og_type":"article","og_title":"Netexpertise - MSA 2012i SAN Performance Windows vs Linux","og_description":"I&#8217;ve noticed backups are getting slower and slower over time going from 500 to 2500MB\/min throughput. 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