Changes:

• • Shows the disk capacity of the VM and asks how many disks to add.
  • Prompts for the size of every disk
  • Checks for empty Luns to add the disks

# 1. You need to login to the Azure Rm Account

Login-AzAccount

# 2. The script will query the Subscriptions that the login account has access and will promt the user to select the target Subscription from the drop down list
 
$subscription = Get-AzSubscription | Out-GridView -Title "Select a Subscription" -PassThru
Select-AzSubscription -SubscriptionId $subscription.Id

# 3. The script will query the available VMs and promt to select the target VM from the VM list
 
$vm = Get-AzVM | Out-GridView -Title "Select the Virtual Machine to add Data Disks to" -PassThru

# 4. I set the storage type based on the OS disk. If you want to spesify somehting else you can cahnge this to: $storageType = StandardLRS or PremiumLRS etc.

$storageType = $VM.StorageProfile.OsDisk.ManagedDisk.StorageAccountType

# 5. Enter how many data disks you need to create

$VMdiskCapacity = ($VM.StorageProfile.DataDisks).Capacity
 
$diskquantity = Read-Host "How many disks you need to create? Max Capacity" $VMdiskCapacity "."

# 6. The script will promt for disk size, in GB

$diskSizeList = @()
for($i = 1; $i -le $diskquantity; $i++)
{
    $disk = (Read-Host "Disk " $i " Size")
    $diskSizeList += $disk
}
$diskSizeList

# 7. check for exisiting disks

$existinglun = @()
for($i = 0; $i -lt $VMdiskCapacity; $i++) {
    $existinglun += ($VM.StorageProfile.DataDisks)[$i].Lun
}

# 8. disks creation

for($i = 0; $i -lt $diskquantity; $i++)
{
$diskName = $vm.Name + "-DataDisk-" + $i.ToString()
$diskConfig = New-AzDiskConfig -AccountType $storageType -Location $vm.Location -CreateOption Empty -DiskSizeGB $diskSizeList[$i]
$DataDisk = New-AzDisk -DiskName $diskName -Disk $diskConfig -ResourceGroupName $vm.ResourceGroupName
for ($j = 0; $j -lt $VMdiskCapacity; $j++) {
    if ( $null -eq $existinglun[$j] ) {
        $nextLunIndex
        for ($k = 0; $k -lt $VMdiskCapacity; $k++ ) {
            $nextLunIndex = $k
            for ( $m = 0; $m -lt $VMdiskCapacity; $m++ ) {
                if ( $k -eq $existinglun[$m] ) {
                    $nextLunIndex = -1 
                    break 
                }
            }
            if ($nextLunIndex -ne -1 ) {
                break
            }
        }
        Add-AzVMDataDisk -VM $vm -Name $DiskName -CreateOption Attach -ManagedDiskId $DataDisk.Id -Lun $nextLunIndex
        $existinglun[$j] = $nextLunIndex
        break
    } 
}
}
Update-AzVM -VM $vm -ResourceGroupName $vm.ResourceGroupName

You can download the script from: https://github.com/proximagr/automation/blob/master/Add-DataDisks-DIffSize_v3.ps1

Pantelis Apostolidis

Pantelis Apostolidis is a Sr. Specialist, Azure at Microsoft and a former Microsoft Azure MVP. For the last 20 years, Pantelis has been involved to major cloud projects in Greece and abroad, helping companies to adopt and deploy cloud technologies, driving business value. He is entitled to a lot of Microsoft Expert Certifications, demonstrating his proven experience in delivering high quality solutions. He is an author, blogger and he is acting as a spokesperson for conferences, workshops and webinars. He is also an active member of several communities as a moderator in azureheads.gr and autoexec.gr. Follow him on Twitter @papostolidis.

www.cloudcorner.gr

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