title: Adding a disk to an Azure VM using PowerShell ARM script
body: <p>I'm trying to add a disk to a VM in Azure using the following PowerShell script:</p>
  
  <pre><code>$rgName = "${resourceManager}"
  $stName = "${storageAccount}"
  $diskname="${diskName}"
  $lun = ${lunNum}
  $vmName = "${vmName}"
  $diskSize=${diskSize}
  
  $storageAcc=Get-AzureRmStorageAccount -ResourceGroupName $rgName -Name $stName
  $diskpath=$storageAcc.PrimaryEndpoints.Blob.ToString() + "vhds/" +  $diskname  + ".vhd"
  $vm = Get-AzureRmVM -ResourceGroupName $rgName -Name $vmName | Add-AzureRmVMDataDisk -Name $diskname -VhdUri $diskpath -CreateOption empty -DiskSizeInGB $diskSize -Lun $lun
  $vm.Tags = $null
  $vm | Update-AzureRmVM
  </code></pre>
  
  <p>The following are descriptions of the values I need:</p>
  
  <pre><code>SubscriptionID - Azure Subscription ID
  AzureUsername - Name of Azure service account. It must be configured as co-administrator on the Azure Subscription
  AzurePassword - Associated Azure service account password
  resourceManager - Name of Resource Manager (RM) containing the VM
  storageAccount - Name of storage account (within the specified RM), where to create the new disk
  diskName - desired name of the disk
  diskSize - desired size of the disk in Giga Bytes, this is a quota, up to 1000 GB is allowed
  lunNum - the lun number to use, valid values are 0,1,2,3, etc.
  vmName - the name of an existing VM where to attach the new disk
  </code></pre>
  
  <p>The following are test values I use in the script:</p>
  
  <pre><code>SubscriptionID - 06e2bb3d-e66d-4a21-a4a0-78b2fe53f8c6
  AzureUsername – test@outlook.com    
  AzurePassword – test123
  resourceManager – 
  storageAccount -
  diskName - test
  diskSize - 100
  lunNum - 
  vmName - ALPHABETTVM001
  </code></pre>
  
  <p>I'm unsure where to procure the resourceManager, storageAccount, and lunNum inputs. I'm functionally testing Azure scripts that have been converted from the old ASM to new ARM model, but I don't have a lot of experience with this. Where can I find these three values for my given virtual machine?</p>