Script to Change Disk type inside Azure VM(HDD or SSD or Premium SSD)

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Important:

Disclaimer:

    The below script is tested but it might need to be customised in accordance with the environment/Requirement. Please test this in you LAB/POC environment before trying this in Production VM’s.

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Prerequisites:

Install Azure Az command in Powershell

        https://docs.microsoft.com/en-us/powershell/azure/install-az-ps?view=azps-6.3.0

Connect Azure inside Powershell

        Connect-AzAccount

 Select subscription

        Get-AzSubscription -SubscriptionName “Subscription Name” | select-AzSubscription    

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#Name of the Azure Resource Group on which the VM’s are located

$rgName = ‘Resource Group Name’

# Choose Disk Type Standard_LRS, StandardSSD_LRS or Premium_LRS

$storageType = ‘Premium_LRS’

#Retrieve the Name of the Virtual Machine

$vmNames = Get-content ” Patch of the text file which contains VM names”

Start-Transcript -path ” Path where you want to save the Log file “

foreach ($vmName in $vmNames) {

        # Stop the VM before changing the Size/Disktype

        Stop-AzVM -ResourceGroupName $rgName -Name $vmName -Force

        $vm = Get- AzVM -Name $vmName -resourceGroupName $rgName

# Not all sizes supports Premium Disk and the VMSize has to be upgraded. Skip the below if it not suits your 

#$vm.HardwareProfile.VMSize = $size

#Update-AzVM -VM $vm -ResourceGroupName $rgName

# Get all disks that belong to the selected VM, convert to Premium Disk

        $vmDisks = Get-AzDisk -ResourceGroupName $rgName

# For disks that belong to the selected VM, Convert to Premium Disk

foreach ($disk in vmDisks)

{

    if($disk_ManagedBy -eq $vm.Id)

    {

        $disk.Sku = [Microsoft.Azure.Management.Compute.Models.DiskSku]::new($storageType)

        $disk | Update-AzDisk

    }

}

Start-AzVM -ResourceGroupName $rgName -Name $vmName

Write-Output $vmName | Out-File ‘Path to the log File’ -Append

}

Stop-Transcript