{"id":2010,"date":"2010-09-06T10:24:20","date_gmt":"2010-09-06T10:24:20","guid":{"rendered":"http:\/\/www.markwilson.co.uk\/blog\/?p=2010"},"modified":"2010-09-06T13:58:09","modified_gmt":"2010-09-06T13:58:09","slug":"hyper-v-r2-dynamic-memory-over-subscription-vs-over-commitment","status":"publish","type":"post","link":"https:\/\/www.markwilson.co.uk\/blog\/2010\/09\/hyper-v-r2-dynamic-memory-over-subscription-vs-over-commitment.htm","title":{"rendered":"Hyper-V R2 Dynamic Memory: over-subscription vs. over-commitment"},"content":{"rendered":"<p>There&#8217;s been a lot of talk about how Microsoft&#8217;s Dynamic Memory capability in Hyper-V R2 compares with similar features from VMware &#8211; including the pros\/cons of each approach. Because that&#8217;s been so well-covered elsewhere, I&#8217;ll avoid it here (from the VMware perspective, check out <a href=\"http:\/\/www.vcritical.com\/\">Eric Gray (vCritical)<\/a>, \u00c2\u00a0for Microsoft <a href=\"http:\/\/blogs.msdn.com\/virtual_pc_guy\/\">Ben Armstrong<\/a> is your man and, for a completely unbiased and objective view&#8230; well, good luck finding one). I did see an interesting quote however from <a href=\"http:\/\/blogs.msdn.com\/b\/virtual_pc_guy\/archive\/2010\/08\/19\/heading-down-under.aspx\">one of Ben&#8217;s TechEd sessions in New Zealand recently<\/a>:<\/p>\n<blockquote>\n<ul>\n<li>&#8220;Over-subscription is what airlines do by selling more seats than places in a plane.<\/li>\n<li>Over-commitment is what happens when all those passengers actually show up to use their seat.&#8221;<\/li>\n<\/ul>\n<p class=\"citation\">[Ben Armstrong at TechEd New Zealand]<\/p>\n<\/blockquote>\n<p>One of my fellow Virtual Machine MVPs, <a href=\"https:\/\/mvp.support.microsoft.com\/profile\/Ronald.Beekelaar\">Ronald Beekelaar<\/a>, extended this analogy and it seemed good to share it more widely&#8230;<\/p>\n<p>There is nothing wrong with over-subscription &#8211; it happens in many real-world scenarios such as: public transport; libraries; Doctors&#8217; surgeries; hospitals; utility companies; telephone systems; etc.\u00c2\u00a0 &#8211; and these work well (most of the time). The issues occur when all of the people that could actually use the service try to at the same time, at which time we have over-commited the service.<\/p>\n<p>What do we do when we have over-commitment? We add more resources (run extra buses, add carriages to a train, add books to the library, open a new hospital ward, lay more telephone cables, etc.) &#8211; and in the world of virtualisation, we add one or more hosts and migrate some of the conflicting workloads away.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>There&#8217;s been a lot of talk about how Microsoft&#8217;s Dynamic Memory capability in Hyper-V R2 compares with similar features from VMware &#8211; including the pros\/cons of each approach. Because that&#8217;s been so well-covered elsewhere, I&#8217;ll avoid it here (from the VMware perspective, check out Eric Gray (vCritical), \u00c2\u00a0for Microsoft Ben Armstrong is your man and, &hellip; <a href=\"https:\/\/www.markwilson.co.uk\/blog\/2010\/09\/hyper-v-r2-dynamic-memory-over-subscription-vs-over-commitment.htm\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Hyper-V R2 Dynamic Memory: over-subscription vs. over-commitment<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[],"tags":[76],"class_list":["post-2010","post","type-post","status-publish","format-standard","hentry","tag-hyper-v"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Hyper-V R2 Dynamic Memory: over-subscription vs. over-commitment - markwilson.it<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.markwilson.co.uk\/blog\/2010\/09\/hyper-v-r2-dynamic-memory-over-subscription-vs-over-commitment.htm\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Hyper-V R2 Dynamic Memory: over-subscription vs. over-commitment - markwilson.it\" \/>\n<meta property=\"og:description\" content=\"There&#8217;s been a lot of talk about how Microsoft&#8217;s Dynamic Memory capability in Hyper-V R2 compares with similar features from VMware &#8211; including the pros\/cons of each approach. Because that&#8217;s been so well-covered elsewhere, I&#8217;ll avoid it here (from the VMware perspective, check out Eric Gray (vCritical), \u00c2\u00a0for Microsoft Ben Armstrong is your man and, &hellip; Continue reading Hyper-V R2 Dynamic Memory: over-subscription vs. over-commitment\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.markwilson.co.uk\/blog\/2010\/09\/hyper-v-r2-dynamic-memory-over-subscription-vs-over-commitment.htm\" \/>\n<meta property=\"og:site_name\" content=\"markwilson.it\" \/>\n<meta property=\"article:published_time\" content=\"2010-09-06T10:24:20+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2010-09-06T13:58:09+00:00\" \/>\n<meta name=\"author\" content=\"Mark Wilson\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@markwilsonit\" \/>\n<meta name=\"twitter:site\" content=\"@markwilsonit\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Mark Wilson\" \/>\n\t<meta name=\"twitter:label2\" content=\"Estimated reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2010\\\/09\\\/hyper-v-r2-dynamic-memory-over-subscription-vs-over-commitment.htm#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2010\\\/09\\\/hyper-v-r2-dynamic-memory-over-subscription-vs-over-commitment.htm\"},\"author\":{\"name\":\"Mark Wilson\",\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/#\\\/schema\\\/person\\\/98f61365e7c39d6be942174b8c4de468\"},\"headline\":\"Hyper-V R2 Dynamic Memory: over-subscription vs. over-commitment\",\"datePublished\":\"2010-09-06T10:24:20+00:00\",\"dateModified\":\"2010-09-06T13:58:09+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2010\\\/09\\\/hyper-v-r2-dynamic-memory-over-subscription-vs-over-commitment.htm\"},\"wordCount\":272,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/#\\\/schema\\\/person\\\/98f61365e7c39d6be942174b8c4de468\"},\"keywords\":[\"Microsoft Virtual Server\\\/Hyper-V\"],\"inLanguage\":\"en-GB\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2010\\\/09\\\/hyper-v-r2-dynamic-memory-over-subscription-vs-over-commitment.htm#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2010\\\/09\\\/hyper-v-r2-dynamic-memory-over-subscription-vs-over-commitment.htm\",\"url\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2010\\\/09\\\/hyper-v-r2-dynamic-memory-over-subscription-vs-over-commitment.htm\",\"name\":\"Hyper-V R2 Dynamic Memory: over-subscription vs. over-commitment - markwilson.it\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/#website\"},\"datePublished\":\"2010-09-06T10:24:20+00:00\",\"dateModified\":\"2010-09-06T13:58:09+00:00\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2010\\\/09\\\/hyper-v-r2-dynamic-memory-over-subscription-vs-over-commitment.htm#breadcrumb\"},\"inLanguage\":\"en-GB\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2010\\\/09\\\/hyper-v-r2-dynamic-memory-over-subscription-vs-over-commitment.htm\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2010\\\/09\\\/hyper-v-r2-dynamic-memory-over-subscription-vs-over-commitment.htm#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Hyper-V R2 Dynamic Memory: over-subscription vs. over-commitment\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/#website\",\"url\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/\",\"name\":\"markwilson.it\",\"description\":\"get-info -class technology | write-output &gt; 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There are those (generally those who have a big investment in VMware technologies) who say Microsoft's hypervisor lacks the features to\u2026","rel":"","context":"In \"Linux\"","block_context":{"text":"Linux","link":"https:\/\/www.markwilson.co.uk\/blog\/tag\/linux"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1225,"url":"https:\/\/www.markwilson.co.uk\/blog\/2008\/09\/microsoft-virtualization-part-2-host-virtualisation.htm","url_meta":{"origin":2010,"position":2},"title":"Microsoft Virtualization: part 2 (host virtualisation)","author":"Mark Wilson","date":"Thursday 25 September 2008","format":false,"excerpt":"Earlier this evening I kicked off a series of posts on the various technologies that are collectively known as Microsoft Virtualization and the first area I'm going to examine is that of server, or host, virtualisation. Whilst competitors like VMware have been working in the x86 virtualisation space since 1998,\u2026","rel":"","context":"In \"Microsoft Virtual PC\"","block_context":{"text":"Microsoft Virtual PC","link":"https:\/\/www.markwilson.co.uk\/blog\/tag\/virtual-pc"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1416,"url":"https:\/\/www.markwilson.co.uk\/blog\/2009\/04\/microsoft-virtualization-the-r2-wave.htm","url_meta":{"origin":2010,"position":3},"title":"Microsoft Virtualization: the R2 wave","author":"Mark Wilson","date":"Friday 17 April 2009","format":false,"excerpt":"The fourth Microsoft Virtualisation User Group (MVUG) meeting took place last night and Microsoft's Matt McSpirit presented a session on the R2 wave of virtualisation products. I've written previously about some of the things to expect in Windows Server 2008 R2 but Matt's presentation was specifically related to virtualisation and\u2026","rel":"","context":"In &quot;Technology&quot;","block_context":{"text":"Technology","link":"https:\/\/www.markwilson.co.uk\/blog\/topic\/technology"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1429,"url":"https:\/\/www.markwilson.co.uk\/blog\/2009\/04\/windows-server-2008-r2-release-candidate-whats-new-part-1.htm","url_meta":{"origin":2010,"position":4},"title":"Windows Server 2008 R2 release candidate: what&#8217;s new? (part 1)","author":"Mark Wilson","date":"Thursday 30 April 2009","format":false,"excerpt":"Last year, I wrote a post about some of the things to look forward to in Windows Server 2008 R2 and, a week or so later, I was able to follow it up with the news that Terminal Services gets a big improvement as it becomes Remote Desktop Services (RDS).\u2026","rel":"","context":"In \"Microsoft Windows Server 2008 R2\"","block_context":{"text":"Microsoft Windows Server 2008 R2","link":"https:\/\/www.markwilson.co.uk\/blog\/tag\/windows-server-2008-r2"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1472,"url":"https:\/\/www.markwilson.co.uk\/blog\/2009\/07\/early-reports-of-slat-enabled-processors-significantly-increasing-rds-session-concurrency.htm","url_meta":{"origin":2010,"position":5},"title":"Early reports of SLAT-enabled processors significantly increasing RDS session concurrency","author":"Mark Wilson","date":"Thursday 9 July 2009","format":false,"excerpt":"Let me caveat my next statement by saying that I think Hyper-V is a great virtualisation platform that meets the needs of many customer environments... but... 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