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What happens if you messed up with CSV Volumes? Solution: Repair-VMConfig
Posted in Virtual Machine Manager, Windows Powershell, Windows Server | No Comment | 1,946 views | 08/06/2014 21:56

Your Hyper-V storage environment crashed and you restored it from a backup or volume snapshot or you want to restore all virtual machines to the Disaster Center via Storage Replication. You added new storage luns into Failover Cluster but CSV names are changed. In that case you may not be able to import Virtual Machines into Hyper-V quickly due to incorrect virtual disk paths.

This script will check all Virtual Machine configs and shows you which configuration is not correct.
Then you can fix it manually or you can fix it via this script.

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function Repair-VMConfig {
 
<#
    .SYNOPSIS
 
        Function to repair Virtual Machine config after CSV volume path changes.
        You should put a volume identifier into CSV volumes to be able to use this script.
	Simply put a Volume1.CSV into Volume1 as a volume identifier.
 
    .DESCRIPTION
 
	In some cases, CSV volume names could be changed. So you may not start your virtual machines due to incorrect virtual disk paths.
	This function is written to fix this issue. It finds all Virtual Machines configuration problems and shows you as a output.
	If you use ApplyChanges switch, it stops all Hyper-V Management Services in all Cluster Nodes, backups VM configs and fix incorrect VM virtual disk paths. Restarts Hyper-V Management Services after changes.
	You should put a volume identifier into CSV volumes to be able to use this script. Simply put a Volume1.CSV into Volume1 as a volume identifier.
 
    .PARAMETER  WhatIf
 
        Display what would happen if you would run the function with given parameters.
 
    .PARAMETER  Confirm
 
        Prompts for confirmation for each operation. Allow user to specify Yes/No to all option to stop prompting.
 
    .EXAMPLE
 
        Repair-VMConfig
	Just shows VM configuration problems and do not take any action unless you add -ApplyChanges switch.
 
    .EXAMPLE
 
        Repair-VMConfig -ApplyChanges
        Stops all Hyper-V Management Services in all Cluster Nodes, backups VM configs and fix incorrect VM virtual disk paths. Restarts Hyper-V Management Services after changes.
 
    .INPUTS
 
        ApplyChanges switch to apply changes on Virtual Machines.
 
    .OUTPUTS
 
        None
 
    .NOTES
 
        Author: Yusuf Ozturk
        Website: http://www.yusufozturk.info
        Email: ysfozy@gmail.com
        Date created: 07-June-2014
        Last modified: 08-June-2014
        Version: 1.2
 
    .LINK
 
        http://www.yusufozturk.info
	http://twitter.com/yusufozturk
 
#>
 
[CmdletBinding(SupportsShouldProcess = $true)]
param (
 
    # Do you confirm changes on Virtual Machines?
	[Parameter(
        Mandatory = $false,
        HelpMessage = 'Do you confirm changes on Virtual Machines?')]
    [switch]$ApplyChanges = $false,
 
	# Debug Mode
	[Parameter(
        Mandatory = $false,
        HelpMessage = 'Debug Mode')]
    [switch]$DebugMode = $false
)
 
	if ($ApplyChanges -eq $True)
	{
		# Get Cluster Node List
		$ClusterNodes = Get-Cluster | Get-ClusterNode
 
		foreach ($ClusterNode in $ClusterNodes)
		{
			# Stop Hyper-V Management Service
			Invoke-Command -ComputerName $ClusterNode -ScriptBlock {
				Set-Service "vmms" -StartupType Disabled
				Stop-Service "vmms"
			}
		}
	}
 
	# Read All CSV Directories
	$CSVVolumes = Get-ChildItem "C:\ClusterStorage"
 
	foreach ($CSVVolume in $CSVVolumes)
	{
		# Informational Output
		Write-Host " "
		Write-Host " "	
		Write-Host "Working on $CSVVolume .." -ForegroundColor Cyan
		Write-Host " "
 
		# CSV Volume Name
		$CSVVolumeName = $CSVVolume.Name
 
		# Read All VM Config Files
		$VMConfigs = Get-ChildItem "C:\ClusterStorage\$CSVVolumeName" -Filter "*.xml" -Recurse
 
		foreach ($VMConfig in $VMConfigs)
		{
			# Set Replace VM Config Identifier
			$ReplaceVMConfig = "0"
 
			# Get VM Config Full Path
			$VMConfigPath = $VMConfig.FullName
 
			if ($ApplyChanges -eq $True)
			{			
				# VM Config Backup Name
				$VMConfigBackupPath = $VMConfigPath + ".backup"
 
				# Backup Old VM Config
				$BackupVMConfig = Copy-Item -Path $VMConfigPath -Destination $VMConfigBackupPath
			}
 
			# Informational Output
			Write-Host " "
			Write-Host "Working on $VMConfigPath .." -ForegroundColor Yellow
 
			# CSV Volume Regex Pattern
			$Pattern = '<pathname type="string">(.*?)</pathname>'
 
			# Get VM Config Content
			$VMConfigContent = Get-Content "$VMConfigPath"
 
			# Get CSV Volume Name
			$RegexResults = $VMConfigContent -match $Pattern
 
			foreach ($RegexResult in $RegexResults)
			{			
				# Search for Virtual Disks
				$RegexSearch = [string]$RegexResult -match $Pattern
 
				# Get Virtual Disk Path
				$VHDPath = $Null;
				$VHDPath = $Matches[1]
 
				if ($VHDPath)
				{
					# Check VHD Path
					$TestVHDPath = $Null;
					$TestVHDPath = Test-Path "$VHDPath"
 
					if (!$TestVHDPath)
					{
						Write-Host "Error: $VHDPath" -ForegroundColor Red
 
						# CSV Volume Pattern
						$CSVPattern = "volume\d{1,2}"
 
						# Search for CSV Volume Name
						$RegexSearch = [string]$RegexResult -match $CSVPattern
 
						# Get CSV Volume Name
						$CSVName = $Null;
						$CSVName = $Matches[0]
 
						if ($CSVName -like "Volume*")
						{						
							# Get CSV Volume Filter
							$CSVVolumeFilter = "*" + $CSVName + ".CSV"
 
							# Find CSV Directory
							$GetCSVDirectory = $Null;
							$GetCSVDirectory = (Get-ChildItem "C:\ClusterStorage" -Filter "$CSVVolumeFilter" -Recurse).Directory.FullName
 
							if ($GetCSVDirectory -ne $Null)
							{
								# Get Config Content
								$ConfigContent = Get-Content -Path "$VMConfigPath"
 
								# Get New CSV Volume
								$NewCSVVolume = $GetCSVDirectory.Split("\")[-1]
 
								# Check CSV Volume
								if ($NewCSVVolume -like "Volume*")
								{
									$NewCSVVolume = "TEMPORARY_VOLUME" + $NewCSVVolume.Substring("0,6")
 
									if ($ApplyChanges -eq $True)
									{
										# Replace CSV Volume
										$Regex = New-Object Text.RegularExpressions.Regex $CSVName, "None"
										$NewConfigContent = $Regex.Replace($ConfigContent, $NewCSVVolume)
 
										# Save Changes on Config
										Set-Content -Value "$NewConfigContent" -Path "$VMConfigPath" -Encoding "BigEndianUnicode"
 
										# Set Replace VM Config Identifier
										$ReplaceVMConfig = "1"
									}
								}
								else
								{
									Write-Host "Error: Could not get volume name of $VHDPath" -ForegroundColor Red
								}
							}
							else
							{
								Write-Host "Error: Could not find any volume identifier for $CSVName" -ForegroundColor Red
							}
						}
						else
						{
							Write-Host "Error: $VHDPath is not on a CSV Volume" -ForegroundColor Red
						}
					}
					else
					{
						Write-Host "OK: $VHDPath" -ForegroundColor Green
					}
				}
			}
 
			if ($ApplyChanges -eq $True)
			{			
				if ($ReplaceVMConfig -eq "1")
				{
					# Get Config Content
					$ConfigContent = Get-Content -Path "$VMConfigPath"
 
					# CSV Volume Prefix
					$CSVVolumePrefix = "Volume"
 
					# Replace CSV Volume
					$Regex = New-Object Text.RegularExpressions.Regex "TEMPORARY_VOLUME", "None"
					$NewConfigContent = $Regex.Replace($ConfigContent, $CSVVolumePrefix)
 
					# Save Changes on Config
					Set-Content -Value "$NewConfigContent" -Path "$VMConfigPath" -Encoding "BigEndianUnicode"
				}
			}
		}
	}
 
	if ($ApplyChanges -eq $True)
	{
		foreach ($ClusterNode in $ClusterNodes)
		{
			# Start Hyper-V Management Service
			Invoke-Command -ComputerName $ClusterNode -ScriptBlock {
				Set-Service "vmms" -StartupType Automatic
				Start-Service "vmms"
			}
		}
	}
}

You should add -ApplyChanges switch in order to confirm changes on virtual machine configs. That will backup all VM configs before modification. Also that will stop and start all Hyper-V Management Services in all cluster nodes due to changes on VM configs.



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