Cluster Shared Volume (CSV) is the shared storage system that can be used by multiple cluster members at once for storing and running virtual machines in a Hyper-V cluster. CSV is specifically customised for Hyper-V and should not be used for anything else \u2013 you even have to agree to than to enable it. That customisation means that things would change a bit.<\/p>\n
VSS is the Volume Shadow Copy Service. Using Hyper-V certified backup solutions like DPM you can backup the state of a virtual machine running in Hyper-V in a supported manner. This is done at the host level. That\u2019s different to a file level backup that you would do with an agent installed in the VM. That would be able to recover individual files. The host level backup would be able to recover the entire VM back to the point of time that you did the backup.<\/p>\n
There have been reports of issues. For example, DPM 2007 R2 is not live migration aware. You\u2019ll have to wait until around April for DPM 2010 for a solution to that. That only affects the snapshot backups.<\/p>\n
A rollup package has been released by Microsoft for Windows Server 2008 R2 Hyper-V to resolve some issues with CSV and VSS. Thanks to Hans Vredevoort<\/a> (clustering MVP) for making me aware of this. Article KB975354<\/a> fixes the following situations.<\/p>\n \u201cThis update rollup package resolves some issues that occur when you backup or restore Hyper-V virtual machines<\/em><\/p>\n Issue 1 <\/em><\/u><\/strong><\/p>\n Consider the following scenario:<\/em><\/p>\n In this scenario, the error code 0x800423f4 occurs when you back up the virtual machine. Additionally, the following event is logged into the Hyper-V Virtual Machine Management Service event log: <\/em><\/p>\n The number of reverted volumes does not match the number of volumes in the snapshot set for virtual machine "’virtual machine name’ (Virtual machine ID <GUID>)". <\/em><\/p>\n Issue 2 <\/em><\/u><\/strong><\/p>\n Consider the following scenario: <\/em><\/p>\n In this scenario, the virtual machine backup operation fails. <\/em><\/p>\n Issue 3 <\/em><\/u><\/strong><\/p>\n Consider the following scenario:<\/em><\/p>\n In this scenario, some data is truncated from the application backup in the virtual machine. Therefore, this behaviour causes data loss. <\/em><\/p>\n Issue 4 <\/em><\/u><\/strong><\/p>\n Consider the following scenario:<\/em><\/p>\n In this scenario, the restore operation fails and the virtual machine may be corrupted\u201d. <\/em><\/p>\n If you\u2019re running a Windows Server 2008 R2 Hyper-V cluster and are still getting used to it then there\u2019s some good news. Here\u2019s how I\u2019ll approach this:<\/p>\n That should <\/em>work. And it\u2019ll probably be your first opportunity to use Live Migration and VMM 2008 R2 Maintenance Mode in anger. Think about it, when do you normally get to do server patching during the work day? Now you can!<\/p>\n","protected":false},"excerpt":{"rendered":" Cluster Shared Volume (CSV) is the shared storage system that can be used by multiple cluster members at once for storing and running virtual machines in a Hyper-V cluster. CSV is specifically customised for Hyper-V and should not be used for anything else \u2013 you even have to agree to than to enable it. That … Continue reading “KB975354: W2008 R2 Hyper-V Rollup for CSV and VSS”<\/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":[181,117],"class_list":["post-10031","post","type-post","status-publish","format-standard","hentry","category-hyper-v","tag-hyper-v","tag-windows-server-2008-r2"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n
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