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Matt McSpirit on Virtualisation, Management and Core Infrastructure

Cluster Shared Volumes on 2008 R2 – Configuration Guidance Published

Cluster Shared Volumes on 2008 R2 – Configuration Guidance Published

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I’ve had a number of requests for this type of documentation, and it seems like it’s released under the radar, without a fanfare of sorts, however this could be one of the most important sets of documentation that you read around Hyper-V R2.  Obviously, this information should be combined with any storage-vendor-specific information, such as that from NetApp.

Firstly, what is Cluster Shared Volumes?

“Cluster Shared Volumes (CSV) is a feature that simplifies the configuration and management of Hyper-V virtual machines in failover clusters. With CSV, on a failover cluster that runs Hyper-V, multiple virtual machines can use the same LUN (disk) yet fail over (or move from node to node) independently of one another. CSV provides increased flexibility for volumes in clustered storage—for example, it allows you to keep system files separate from data to optimize disk performance, even if the system files and the data are contained within virtual hard disk (VHD) files. If you choose to use live migration for your clustered virtual machines, CSV can also provide performance improvements for the live migration process”

‘Simples’, right?  Yes, in concept, but planning the layout and sizing of your disks is a more complicated proposition.  Thankfully, here’s the guidance:

Hopefully that helps with any storage questions you may have around CSV!



Comments
  • the best reason to break out csv's based on useage is snapshots!  Have a minimal snap shot rate for the os partition, no snaps for the pagefile and what ever your sla deems necessary for the data volume!  I'm thinking that the way w2k8r2 coalesese(sic) IO may change some of the traditional think on drive layouts.  Is this correct?

    thanks

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