Resize Azure Windows OS disk script.

What happens when you have a Windows VM in Azure and you need to resize the disk size? You can’t do this in the portal, you need to use Powershell.

The full script

 1Function Resize-VM-OS-Disk(
 2    [String]$SubscriptionName,
 3    [String]$ResourceGroupName,
 4    [String]$VmName,
 5    [Int32]$NewDiskSize
 6)
 7{
 8    Connect-AzAccount
 9    
10    Select-AzSubscription –SubscriptionName $SubscriptionName
11
12    $vm = Get-AzVM -ResourceGroupName $ResourceGroupName -Name $vmName
13
14    Stop-AzVM -ResourceGroupName $ResourceGroupName -Name $vmName
15
16
17    $disk= Get-AzureRmDisk -ResourceGroupName $ResourceGroupName -DiskName $vm.StorageProfile.OsDisk.Name
18    $disk.DiskSizeGB = $NewDiskSize
19    Update-AzDisk -ResourceGroupName $ResourceGroupName -Disk $disk -DiskName $disk.Name
20
21    Start-AzVM -ResourceGroupName $ResourceGroupName -Name $vmName
22}

Example to call the above script:

1Resize-VM-OS-Disk -VmName "VM_NAME" -SubscriptionName "SUBSCRIPTION_NAME" -ResourceGroupName "RESOURCE_GROUP_NAME" -NewDiskSize 64