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Expanding Virtual HDs managed by Windows Failover Cluster

This article explains how to expand a VHD or VHDx Virtual Hard Drive on hosts under the control of Windows Cluster Services while the VM is down or offline.

Step 1 – Use Cluster Manager to expand the VHD file

  • Log into one of the cluster nodes
  • Start the Cluster Failover Manager console
  • Shutdown the VM

Shutdown the VM

Expand the VHD file

  • Right-Click the VM attached to the VHD to expand
  • Note:  A VHD may be connected to more than one VM
  • Select Settings

Select VM Settings

  • Under the Hardware section select “Hard Drive”
  • Select the Edit button

This will start the Edit Virtual Hard Disk Wizard

Edit Hard Drive Wizard

Click NEXT then select the Expand Option to expand the VHD

Expand VHD Wizard

Enter the new size for the VHD

Expand Wizard

Select Finish and the VHD is expanded

Edit Wizard done

Step 2 – Expand the VHD disk partition

  • Start the VM
  • Log into the VM with a console
  • Start the “Create and format hard disk partitions” where you can adjust the partition size.  We use the Find function.  Disk Manager is also located inside of “Computer Management”

Find Disk Manager

Find the disk which the VHD you have expanded. It will have Unallocated space at the end.

Expand Partition

Extend the VHD Volume partition

  • Right Click the active partition and click “Extend Volume” to extend the partition to utilize the additional hard disk size.
  • Then we enter the Extend Volume Wizard, where we can increase the size of the partition. If you select the defaults, the partition will be extended to the full size of the VHD.

Extend Volume

Now resize the volume

Partition Expanded

And the Volume is expanded and concatenated.

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