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AzureBrian
Brass Contributor
Mar 30, 2020
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How to increase size of unmanaged disk attached to classic VM

Greetings.  I have a classic VM (using the old Service Manager model) that I need to expand the storage on.  The disk in question is a data disk, not an OS disk, and it is an Unmanaged disk of type Premium (SSD).  What are my options for extending the size of this drive?  Or, would it be easier to just add a new drive to this VM, assuming the VM has capacity for it?  I've searched this site with no meaningful hits.  Also, Googling isn't enormously helpful.  I did see https://docs.microsoft.com/en-us/azure/virtual-machines/windows/expand-os-disk from docs.microsoft.com, but it seems to only speak to Resource Manager VMs.  I would appreciate any thoughts.

 

Thanks,

Brian

4 Replies

    • AzureBrian's avatar
      AzureBrian
      Brass Contributor
      Apr 01, 2020

      Thanks for your response Sirius.  Yes, I know the unmanaged disk scenario is in the same doc, but I think that only works for Resource Manager deployments.  Again, there's no language in the doc that mentions the Classic scenario.  Also, I've tried the Powershell listed in that section and I basically get a null array of disks.  So, I'm thinking the Classic scenario is not supported with that Powershell.

       

       I have also tried using the Azure classic CLI and though I can reference the disks using this command:

      azure vm disk

       there doesn't appear to be a way to update the size of the disk using the update command:

      azure vm disk update --help
 
help:    Update properties of a data-disk attached to a VM
help:
help:    Usage: vm disk update [options] <vm-name> <lun>
help:
help:    Options:
help:      -h, --help                 output usage information
help:      -v, --verbose              use verbose output
help:      -vv                        more verbose with debug output
help:      --json                     use json output
help:      -c, --host-caching <name>  the caching behaviour of disk [None, ReadOnly, ReadWrite]
help:      -d, --dns-name <name>      filter VMs for the specified DNS name
help:      -s, --subscription <id>    the subscription id
help:
help:    Current Mode: asm (Azure Service Management)

      Any other thoughts?

       

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