Extend-WinOSDiskSize.ps1
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<#PSScriptInfo
.VERSION 1.0.0 .GUID e009159d-97e2-492a-a289-42426518dd41 .AUTHOR Arjun Bahree .COMPANYNAME .COPYRIGHT .TAGS Windows PowerShell DiskPartition OSDisk .LICENSEURI https://github.com/bahreex/Bahree-PowerShell-Library/blob/master/LICENSE .PROJECTURI https://github.com/bahreex/Bahree-PowerShell-Library/tree/master/General .ICONURI .EXTERNALMODULEDEPENDENCIES .REQUIREDSCRIPTS .EXTERNALSCRIPTDEPENDENCIES .RELEASENOTES #> <# .DESCRIPTION Lets you extend/Increase the OS Drive Partition Size for any Windows based Machine. #> <# .SYNOPSIS Lets you extend/Increase the OS Drive Partition Size for any Windows based Machine. .DESCRIPTION This script lets you extend/Increase the OS Drive Partition size for any Windows based Machine by adding the entire unallocated space available on the OS Disk, if any. This script is particularly useful for extending the OS Drive partition for Windows based Azure VM's, after the VM OS Disk size has been Increased from outside the VM using PowerShell or Azure Portal. This is so because the Increase in size done for the VM OS Disk from outside does not automatically get added to the OS Drive partition, and shows as unallocated space on the OS Disk of the VM. You will have to manually extend the OS Drive partition from within the VM OS to add the unallocated space to the OS partition. This script helps to automate the same process end-to-end. You need to be already logged into your Azure account through PowerShell before calling this script. .EXAMPLE .\Extend-WinOSDiskSize.ps1 .Notes Author: Arjun Bahree E-mail: arjun.bahree@gmail.com Creation Date: 28/Dec/2017 Last Revision Date: 28/Dec/2017 Development Environment: VS Code IDE PS Version: 5.1 Platform: Windows #> [CmdletBinding()] param () # Iterate through all the disks on the Windows machine foreach($disk in Get-Disk) { # Check if the disk in context is a Boot and System disk if((Get-Disk -Number $disk.number).IsBoot -And (Get-Disk -Number $disk.number).IsSystem) { # Get the drive letter assigned to the disk partition where OS is installed $driveLetter = (Get-Partition -DiskNumber $disk.Number | where {$_.DriveLetter}).DriveLetter Write-verbose "Current OS Drive: $driveLetter :\" # Get current size of the OS parition on the Disk $currentOSDiskSize = (Get-Partition -DriveLetter $driveLetter).Size Write-verbose "Current OS Partition Size: $currentOSDiskSize" # Get Partition Number of the OS partition on the Disk $partitionNum = (Get-Partition -DriveLetter $driveLetter).PartitionNumber Write-verbose "Current OS Partition Number: $partitionNum" # Get the available unallocated disk space size $unallocatedDiskSize = (Get-Disk -Number $disk.number).LargestFreeExtent Write-verbose "Total Unallocated Space Available: $unallocatedDiskSize" # Get the max allowed size for the OS Partition on the disk $allowedSize = (Get-PartitionSupportedSize -DiskNumber $disk.Number -PartitionNumber $partitionNum).SizeMax Write-verbose "Total Partition Size allowed: $allowedSize" if ($unallocatedDiskSize -gt 0 -And $unallocatedDiskSize -le $allowedSize) { $totalDiskSize = $allowedSize # Resize the OS Partition to Include the entire Unallocated disk space $resizeOp = Resize-Partition -DriveLetter C -Size $totalDiskSize Write-verbose "OS Drive Resize Completed $resizeOp" } else { Write-Verbose "There is no Unallocated space to extend OS Drive Partition size" } } } |