Azure Stack HCI Stretched Cluster Volumes - Expand volumes

Hi Jamie,

Yes, it is supported to expand a replicated cluster volume. If the volume is thin provisioned, the option to extend the volume will be greyed out in WAC (this is a known limitation). You will need to perform the expansion via PowerShell.

If the volume was created using WAC, it was created as a tiered volume. As such, you would need to expand the tiers first, then expand the partition. You will need to do this for both the data and replica volumes. You should then be able to resize the partition.

The sample script below is one way of doing this. I have also seen instances where the method below of extending the partitions did not work, but using diskpart to expand the partition did.

NOTE: The script below is provided as-is with no warranties or guarantees of support. It is up to you as the user to verify and test the script thoroughly. Microsoft accepts no liability from the use of this script in any form.

#Confirm the FriendlyName of the storage tiers you wish to expand
Get-StorageTier

#Expand the storage tiers
Resize-StorageTier -InputObject (Get-StorageTier -FriendlyName "Name of storage tier") -Size <size to be expanded>

#Confirm the FriendlyName of the virtual disk you wish to expand
Get-VirtualDisk 

#Set the virtual disk as a variable
$virtualdisk = Get-VirtualDisk <Name of virtual disk>

#Confirm the partition number you want to expand
$virtualdisk | Get-Disk | Get-Partition

#Set the partition as a variable
$partition = $virtualdisk | Get-Disk | Get-Partition | Where PartitionNumber -eq <Value>

#Expand the partition to the maximum size
$partition | Resize-Partition -Size ($partition | Get-PartitionSupportedSize).SizeMax

Hope this helps!