{"id":9757,"date":"2009-07-13T08:52:00","date_gmt":"1999-11-29T20:00:00","guid":{"rendered":"https:\/\/aidanfinn.com\/?p=9757"},"modified":"2009-07-13T08:52:00","modified_gmt":"1999-11-29T20:00:00","slug":"the-big-avhd-mystery","status":"publish","type":"post","link":"https:\/\/aidanfinn.com\/?p=9757","title":{"rendered":"The BIG AVHD Mystery"},"content":{"rendered":"<p align=\"left\">This is a great blog <a href=\"http:\/\/virtuallyaware.spaces.live.com\/Blog\/cns!549C424F228D6040!335.entry\" target=\"_blank\">post<\/a>.\u00a0 The big question is: What does the \u201cA\u201d in AVHD stand for?\u00a0 I never really stopped to wonder that.\u00a0 I\u2019ll let you go to the original post for the answer *evil laugh*<\/p>\n<p align=\"left\">The AVHD is a differential disk that has one purpose: snapshots.\u00a0 When you take a snapshot in Hyper-V a new AVHD is created and linked to your VM\u2019s VHD.\u00a0 One AVHD for each VHD.\u00a0 The VM then switches writes to the AVHD so all new changes are written\/read from there.\u00a0 When you merge the snapshot the changes are written back to the original VHD(s) and the AVHD(s) are deleted.<\/p>\n<p align=\"left\">VM\u2019s with differential disks are slow because they are aren\u2019t fixed size.\u00a0 Every write has the potential of doing a number of tasks:<\/p>\n<ul>\n<li>\n<div align=\"left\">Increase the size of the AVHD<\/div>\n<\/li>\n<li>\n<div align=\"left\">Zero out the new part of the AVHD<\/div>\n<\/li>\n<li>\n<div align=\"left\">Write the new data that the VM wanted to write<\/div>\n<\/li>\n<\/ul>\n<p>If you\u2019re using a Windows Server 2008 cluster then you probably have dedicated LUN\u2019s per VM.\u00a0 You\u2019ve probably kept the LUN sizes to the minimum to minimise disk wastage (storage is NOT cheap despite all the BS out there).\u00a0 When you create that snapshot\/AVHD you will start eating into that space pretty quick.\u00a0 You might fill the LUN which could cause a few things to happen:<\/p>\n<ul>\n<li>The VM will go into a pause state because writes are no longer possible<\/li>\n<li>Save states will fail because there is no space<\/li>\n<li>Using VMM 2008 R2 quick storage migration won\u2019t work because it needs space for additional AVHD\u2019s.<\/li>\n<\/ul>\n<p>I\u2019ve a few tips on AVHD\u2019s:<\/p>\n<ul>\n<li>Minimise their usage on production systems<\/li>\n<li>Use a Hyper-V certified VSS backup system to snapshot your VM\u2019s instead, e.g. DPM 2007 SP1<\/li>\n<li>Consider using a dedicated LUN for the job.\u00a0 I\u2019ve not looked into this one yet.\u00a0 Obviously the LUN will have to be linked to the resource group for the VM in Failover Clustering.\u00a0 VMM 2008 probably won\u2019t like that; that\u2019s probably why the option for an alternative AVHD location isn\u2019t available there.<\/li>\n<\/ul>\n<p>As you can see, using AVHD\u2019s can be messy.\u00a0 I\u2019ve used them in production for one specific scenario: Doing a major upgrade of application or OS and I want a rollback option.\u00a0 Leaving the AVHD running for too long causes it to grow too much so this has to be a quick thing \u2026 snapshot, do the work, delete the snapshot or rollback depending on the success of the work.\u00a0 If you leave the AVHD in place for too long then a merge will take a very long time.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>This is a great blog post.\u00a0 The big question is: What does the \u201cA\u201d in AVHD stand for?\u00a0 I never really stopped to wonder that.\u00a0 I\u2019ll let you go to the original post for the answer *evil laugh* The AVHD is a differential disk that has one purpose: snapshots.\u00a0 When you take a snapshot in &hellip; <a href=\"https:\/\/aidanfinn.com\/?p=9757\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;The BIG AVHD Mystery&#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,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"_wpcom_ai_launchpad_first_post":false,"footnotes":""},"categories":[20],"tags":[],"class_list":["post-9757","post","type-post","status-publish","format-standard","hentry","category-hyper-v"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"This is a great blog post. 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