Month: March 2019

Azure – Expand OS Drive for Azure Virtual Machine

When you create an Azure Virtual Machine, it comes with an OS drive having a default size. The size is different for Windows and Linux machines. ~128GB and ~30GB for Windows and Linux machines respectively. The OS drive can be expanded to a maximum size of 2TB as of this writing. Use the below code to allocate space to your Azure VM’s OS drive. After executing the code, login to the virtual machine and expand (Disk Management for Windows) the drive using the newly allocated space.

 

Resize a Managed Disk:

 

## Resize OS disk size for Managed Disk

# Set Resource Group and Virtual Machine name
$resourceGroupName = 'my_resource_group_name'
$virtualMachineName = 'my_virtual_machine_name'

# Create VM reference object
$vm = Get-AzureRmVM -ResourceGroupName $resourceGroupName -Name $virtualMachineName

# Stop the Virtual Machine
Stop-AzureRmVM -ResourceGroupName $resourceGroupName -Name $virtualMachineName

# Create a reference to the Managed disk and set the size as required
$disk= Get-AzureRmDisk -ResourceGroupName $resourceGroupName -DiskName $vm.StorageProfile.OsDisk.Name
$disk.DiskSizeGB = 1023
Update-AzureRmDisk -ResourceGroupName $resourceGroupName -Disk $disk -DiskName $disk.Name

# Start the Azure Virtual Machine
Start-AzureRmVM -ResourceGroupName $resourceGroupName -Name $virtualMachineName

 

 

Resize an Unmanaged Disk:

 

## Resize OS disk size for Unmanaged Disk

# Set Resource Group and Virtual Machine name
$resourceGroupName = 'my-resource-group-name'
$virtualMachineName = 'my-vm-name'

# Create VM reference object
$vm = Get-AzureRmVM -ResourceGroupName $resourceGroupName -Name $virtualMachineName

# Stop the Virtual Machine
Stop-AzureRmVM -ResourceGroupName $resourceGroupName -Name $virtualMachineName

# Create a reference to the Unmanaged disk and set the size as required
$vm.StorageProfile.OSDisk.DiskSizeGB = 1023
Update-AzureRmVM -ResourceGroupName $resourceGroupName -VM $vm

# Start the Azure Virtual Machine
Start-AzureRmVM -ResourceGroupName $resourceGroupName -Name $virtualMachineName

 

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Azure – Attach and Initialize Data disk to Azure Virtual Machine

When you create an Azure windows virtual machine, it comes a default OS drive (C:\) and a temporary drive (D:\). An azure virtual machine allows you to attach a data disk to it to expand the storage. The number of data disks that can be attached to the VM depends on the Size and Family of the VM.

You can automate the process of attaching the data disk and initializing it using two scripts:

Script 1: initializePartition.ps1

This script contains the code to initialize the RAW partition.

Script 2: attachAndInstallCSE.ps1

This script will attach the data disk to the Azure windows virtual machine. It also installs the Custom Script Extension to the virtual machine.

 

initializePartition.ps1

$disks = Get-Disk | Where partitionstyle -eq 'raw' | sort number
    $letters = 70..89 | ForEach-Object { [char]$_ }
    $count = 0
    $labels = "data1","data2"

    foreach ($disk in $disks) {
        $driveLetter = $letters[$count].ToString()
        $disk |
        Initialize-Disk -PartitionStyle MBR -PassThru |
        New-Partition -UseMaximumSize -DriveLetter $driveLetter |
        Format-Volume -FileSystem NTFS -NewFileSystemLabel $labels[$count] -Confirm:$false -Force
    $count++
    }

 

attachAndInstallCSE.ps1

 

# Declaringvariables
$resourceGroupName = 'resourceGroupName'
$virtualMachineName = 'virtualMachineName'
$location = 'East US'
$storageType = 'Premium_LRS'
$dataDiskName = $virtualMachineName + '_datadisk1'

# Create a new managed data disk
$diskConfig = New-AzureRmDiskConfig -SkuName $storageType -Location $location -CreateOption Empty -DiskSizeGB 128
$dataDisk1 = New-AzureRmDisk -DiskName $dataDiskName -Disk $diskConfig -ResourceGroupName $resourceGroupName

# Get the virtual machine reference
$vm = Get-AzureRmVM -Name $virtualMachineName -ResourceGroupName $resourceGroupName

# Update the VM reference by adding the data disk
$vm = Add-AzureRmVMDataDisk -VM $vm -Name $dataDiskName -CreateOption Attach -ManagedDiskId $dataDisk1.Id -Lun 1

# Update the virtual machine
Update-AzureRmVM -VM $vm -ResourceGroupName $resourceGroupName

## Install the Custom Script Extension that inturn calls the initializePartition.ps1
$location = "East US 2"

# The name you want to give for the CSE
$extensionName = "extensionName"

$fileName = "initializePartition.ps1"

# Storage Account where the initializePartition.ps1 is present
$storageAccountName = "<INSERT_STORAGE_ACCOUNT_NAME>"

# Primary Access Key of Storage Account where the initializePartition.ps1 is present
$storageAccountAccessPrimaryKey = "<INSERT_STORAGE_PRIMARY_ACCESS_KEY>"

# Storage Account container where the initializePartition.ps1 is present
$storageAccountContainerName = "<INSERT_STORAGE_ACCOUNT_CONTAINER_NAME>"

Set-AzureRmVMCustomScriptExtension -ResourceGroupName $resourceGroupName -Location $location -VMName $virtualMachineName -Name $extensionName -TypeHandlerVersion "1.4" -StorageAccountName $storageAccountName -StorageAccountKey $storageAccountAccessPrimaryKey -FileName $fileName -ContainerName $storageAccountContainerName

 

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