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Extend a hyper-v cluster shared volume – san volume without downtime

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First decide whether you want to simply create a new Cluster Shared Volume or extend the old one. If you decide to create a new one and want to move VMs there you can using Storage Migration but there will be downtime!

Steps to extend existing CSV:

  • Login to SAN management, go to the lun or disk and increase its total volume
  • Open the Microsoft Failover Cluster Manager and check the CSV coordinator for the disk or LUN you expanded. (the coordinator is the disk owner for the cluster)
  • GUI Version:
    • Use Disk Management under STORAGE under the Server Manager. Rescan for disks and expand the disk or lun to the new capacity.
  • For Hyper-V or Windows Server Core, you can use DiskPart
  • DiskPart:
    • START–>CMD–>diskpart
    • rescan
    • list volume
    • select volume <vol # to extend>
    • extend
    • list volume to check the new volume size

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