Azure VM Disk Type

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Azure VM Disk Type

Handian Sudianto 6,096

Hello,

If we have 2 data disk on azure vm using standard hdd, can we change one of 2 disk to standard ssd? If we change the disk type, there are potential data loss?

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TP 124.7K Volunteer Moderator

Hi,

Yes, you can change one of the disks to Standard SSD if you want without losing data. You need to Stop the VM so that the VM is Deallocated, change the disk size to Standard SSD, then Start the VM. You could also change the size by detaching the disk while the VM is still running, but I didn't suggest that because it could cause data loss in certain cases.

Please click Accept Answer if the above was useful.

Thanks.

-TP

Handian Sudianto 6,096 Reputation points

2023-10-08T01:41:25.9166667+00:00

When i change disk type from standard hdd to srandard ssd, i can see all data disk ann os disk is changed. So can someone confirm when we change the disk type, this will affected to all disks on that vm?
TP 124.7K Reputation points Volunteer Moderator

2023-10-08T04:36:02.73+00:00

It shouldn't affect all disks, only the one you change.

How are you making the change? What VM instance size is the VM? I did quick test for you. Created VM with 3 Standard HDD disks, then changed one of them to Standard SSD. See screenshot below:
Handian Sudianto 6,096 Reputation points

2023-10-08T05:01:12.6633333+00:00

Hi.. I change the disk type by stopping the vm, go to data disk one and change to standard ssd, then when i refresh the page all disks changed to standard ssd.
TP 124.7K Reputation points Volunteer Moderator

2023-10-08T05:39:38.7133333+00:00
Interesting. Did you verify that all disks had actually changed using other techniques besides the VM's disks blade?

For example, open cloud shell and use Get-AzDisk to list the disks in the VM's resource group:

Get-AzDisk -ResourceGroupName vmResourceGroup|Select @{expr={$_.Name}} -ExpandProperty Sku

Additionally, open a separate tab with the portal and navigate to each disk and check if they show as HDD or SSD. The point of these cross checks is to see if the type of disk did in fact change for all of the disks or if it is a portal display bug and only one of them changed.

I've never seen a case where modifying one disk via the portal changes other disks as well.
Handian Sudianto 6,096 Reputation points

2023-10-09T00:38:05.2133333+00:00

Hi

Today i do test with same steps and now the disk change as expected, only specific disk is changed.

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