{"id":9086,"date":"2008-06-20T23:20:00","date_gmt":"1999-11-29T20:00:00","guid":{"rendered":"https:\/\/aidanfinn.com\/?p=9086"},"modified":"2008-06-20T23:20:00","modified_gmt":"1999-11-29T20:00:00","slug":"hyper-v-ram-requirements","status":"publish","type":"post","link":"https:\/\/aidanfinn.com\/?p=9086","title":{"rendered":"Hyper-V RAM Requirements"},"content":{"rendered":"<p>One of my tasks today was a bit on the tough side.\u00a0 Following up on <a href=\"http:\/\/joeelway.spaces.live.com\/blog\/cns!2095EAC3772C41DB!867.entry\" target=\"_blank\">yesterday<\/a>, I had to be able to calculate the amount of RAM required for each VM, whether it was assigned 1GB, 2GB or 4GB.\u00a0 Form this, based <em>purely<\/em> on RAM, I had to be able to calculate numbers of VM&#8217;s I could get on a host &#8211; CPU, storage and I\/O are well in hand.\u00a0\n<\/p>\n<p>This proved tough.\u00a0 At this point, Hyper-V is still RC1 so there&#8217;s little information out there.\u00a0 The only result from a lot of searching was a MS page about how they virtualised 3 VM&#8217;s, each with 10GB RAM, on a 32GB host.\u00a0 They said they reserved 2GB RAM for the parent partition.\u00a0 Not very useful, to be honest.\n<\/p>\n<p>I couldn&#8217;t find any more so I sent out some mails requesting some help.\u00a0 In the meantime I decided to do some observational testing.\u00a0 I ran VM&#8217;s on my test host and used PerfMon to measure &quot;Hyper-V VM VID Partition &#8211; Overhead bytes&quot;&quot;.\u00a0 The overhead was as follows (rounded up):<\/p>\n<ul>\n<li>0.5GB: .0039% of assigned RAM\n<\/li>\n<li>1GB: .0049% of assigned RAM\n<\/li>\n<li>2GB: .0015% of assigned RAM\n<\/li>\n<li>3GB: .0023% of assigned RAM\n<\/li>\n<li>4GB: .0022% of assigned RAM<\/li>\n<\/ul>\n<p>OK.\u00a0 I loaded my VM&#8217;s to 100% RAM utilisation and that overhead didn&#8217;t change.\u00a0 That gave me something to work with but I was wondering about that 2GB for the parent.\u00a0 Was that official?\u00a0 Did the overhead for the 3 * 10GB machines come from that?\u00a0 Maybe it did?\n<\/p>\n<p>This evening I got some replies.\u00a0 <a href=\"http:\/\/blogs.technet.com\/daven\/default.aspx\" target=\"_blank\">Dave Northey<\/a> sent me a <a href=\"http:\/\/www.microsoft.com\/whdc\/system\/sysperf\/Perf_tun_srv.mspx\" target=\"_blank\">link<\/a> to a document (Performance Tuning Guidelines for Windows Server 2008) that didn&#8217;t turn up in my searches.\u00a0 It says:\n<\/p>\n<p><em>&quot;You should size VM memory as you typically do for server applications on a physical machine. You must size it to reasonably handle the expected load at ordinary and peak times because insufficient memory can significantly increase response times and CPU or I\/O usage. In addition, the root partition must have sufficient memory (leave at least 512 MB available) to provide services such as I\/O virtualization, snapshot, and management to support the child partitions.<\/em>\n<\/p>\n<p><em>A good standard for the memory overhead of each VM is 32 MB for the first 1 GB of virtual RAM plus another 8 MB for each additional GB of virtual RAM. This should be factored in the calculations of how many VMs to host on a physical server. The memory overhead varies depending on the actual load and amount of memory that is assigned to each VM&quot;.<\/em>\n<\/p>\n<p>So I read this two ways (assuming 2GB RAM per VM scenario):<\/p>\n<ul>\n<li>First machine charge = 32MB overhead + 8MB.\u00a0 Second machine charge = 16MB overhead.\n<\/li>\n<li>First machine charge = 32MB overhead + 8MB.\u00a0 Second machine charge = 32MB overhead + 8MB.\u00a0 <\/li>\n<\/ul>\n<p>I&#8217;m assuming it&#8217;s the second scenario for now.\u00a0 I&#8217;ll chase this down next week.\n<\/p>\n<p>I also got a response from <a href=\"http:\/\/blogs.technet.com\/jhoward\/\" target=\"_blank\">John Howard<\/a>.\u00a0 He said:\n<\/p>\n<p><em>&quot;Our general recommendations will be the same as for Windows Server 2008. &#8230; minimum and recommended RAM requirements which are 512MB minimum, 2GB recommended. This is for the parent partition. Our general requirements for just the Hypervisor being launched are a little under 300MB. Any driver stacks, management applications and virtual machine memory are on top of that. In the parent partition, we consume &#8230; RAM per virtual machine&quot;.<\/em>\n<\/p>\n<p>So being fairly conservative, it sounds like we allow 2GB for the parent, another 300MB for Hyper-V, a bit for the drivers of the parent (probably be safe within that 2GB) and then our overhead for RAM for each VM.\u00a0 That gives me something like this:<\/p>\n<table cellspacing=\"0\" cellpadding=\"2\" width=\"291\" border=\"1\">\n<tbody>\n<tr>\n<td valign=\"top\" width=\"90\">\n<p><strong>VM RAM (GB)<\/strong>\n<\/p>\n<\/td>\n<td valign=\"top\" width=\"103\">\n<p><strong>Overhead (MB)<\/strong>\n<\/p>\n<\/td>\n<td valign=\"top\" width=\"96\">\n<p><strong>Total MB Used<\/strong>\n<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"90\">\n<p>0.5\n<\/p>\n<\/td>\n<td valign=\"top\" width=\"104\">\n<p>32\n<\/p>\n<\/td>\n<td valign=\"top\" width=\"96\">\n<p>544\n<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"90\">\n<p>1\n<\/p>\n<\/td>\n<td valign=\"top\" width=\"105\">\n<p>32\n<\/p>\n<\/td>\n<td valign=\"top\" width=\"96\">\n<p>1056\n<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"89\">\n<p>2\n<\/p>\n<\/td>\n<td valign=\"top\" width=\"106\">\n<p>40\n<\/p>\n<\/td>\n<td valign=\"top\" width=\"96\">\n<p>2088\n<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"90\">\n<p>4\n<\/p>\n<\/td>\n<td valign=\"top\" width=\"106\">\n<p>56\n<\/p>\n<\/td>\n<td valign=\"top\" width=\"96\">\n<p>4152<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"<p>One of my tasks today was a bit on the tough side.\u00a0 Following up on yesterday, I had to be able to calculate the amount of RAM required for each VM, whether it was assigned 1GB, 2GB or 4GB.\u00a0 Form this, based purely on RAM, I had to be able to calculate numbers of VM&#8217;s &hellip; <a href=\"https:\/\/aidanfinn.com\/?p=9086\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Hyper-V RAM Requirements&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[20],"tags":[],"class_list":["post-9086","post","type-post","status-publish","format-standard","hentry","category-hyper-v"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.8 - aioseo.com -->\n\t<meta name=\"description\" content=\"One of my tasks today was a bit on the tough side. 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