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Hyper-V CSV Migration: Start-CSVMigration
Posted in Virtual Machine Manager, Windows Powershell, Windows Server | 1 Comment | 2,883 views | 20/07/2014 09:31

Lets assume that you have a 3 years old storage and you are using it to place your virtual machines on Hyper-V Cluster. Then you bought a new storage box, you created LUNs on it and assign them as a CSV volumes on your existing Hyper-V Cluster. So next achievement would be migrating your virtual machines from old storage to new one.

That migration could be a headache if you have many VMs and many storage LUNs. So in that case, you can use following script to migrate Virtual Machines per CSV Volume. Just you need to specify which CSV volume you would like to drain. So let’s assume that volume is Volume1. I will specify that volume like following:

Start-CSVMigration -TargetVolume "Volume1"

Now you need to specify other CSV Luns as well to filter them. Otherwise, you can migrate a VM to old storage again. So we are filtering them like following:

Start-CSVMigration -TargetVolume "Volume1" -FilteredVolumes "Volume2","Volume3","Volume4"

So how does it work?

We are creating an array called FilteredVolumes then adding our old storage luns to this array. You will see that I’m also adding $TargetVolume to same array. Because there is a chance to try to migrate a VM to same volume. So that will prevent that kind of issues.

So how can I get destination volume?

$FullQuery = '((Get-ClusterSharedVolume |' + $Query + ' Select -ExpandProperty SharedVolumeInfo | Select @{label="Name";expression={(($_.FriendlyVolumeName).Split("\"))[-1]}},@{label="FreeSpace";expression={($_ | Select -Expand Partition).FreeSpace}} | Sort FreeSpace -Descending)[0]).Name'

As you can notice from the code below, i’m getting all CSV volumes, filtering old storage volumes, sorting new storage CSVs by their free space and selecting the storage which has biggest available disk space.

So I’ll place VM into that volume:

Move-VMStorage -ComputerName "$ClusterNode" -VMName "$VMName" -DestinationStoragePath "C:\ClusterStorage\$Volume\$VMName"

You can also allow VMs with passthrough disks and vHBA. You just need to add -AllowPT switch.

Start-CSVMigration -TargetVolume "Volume1" -FilteredVolumes "Volume2","Volume3","Volume4" -AllowPT

This is what I use to filter VMs with vHBA:

Where {($_ | Select -expand FibreChannelHostBusAdapters) -eq $Null}

If you get the idea, now I can share full script:

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function Start-CSVMigration {
 
<#
    .SYNOPSIS
 
        Function to migrate all virtual machines placed on a CSV volume by using Hyper-V Live Storage Migration.
 
    .DESCRIPTION
 
        Lets assume that you have a 3 years old storage and you are using it to place your virtual machines on Hyper-V Cluster.
		Then you bought a new storage box, you created LUNs on it and assign them as a CSV volumes on your existing Hyper-V Cluster.
		So next achievement would be migrating your virtual machines from old storage to new one.
		This script moves virtual machines into different CSV volumes by using Hyper-V Live Storage Migration.
 
    .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
 
        Start-CSVMigration -TargetVolume "Volume1"
 
    .EXAMPLE
 
        Start-CSVMigration -TargetVolume "Volume1" -FilteredVolumes "Volume2","Volume3","Volume4"
 
    .EXAMPLE
 
        Start-CSVMigration -TargetVolume "Volume1" -FilteredVolumes "Volume2","Volume3","Volume4" -AllowPT
 
    .INPUTS
 
        None
 
    .OUTPUTS
 
        None
 
    .NOTES
 
        Author: Yusuf Ozturk
        Website: http://www.yusufozturk.info
        Email: ysfozy@gmail.com
        Date created: 05-July-2014
        Last modified: 20-July-2014
        Version: 1.4
 
    .LINK
 
        http://www.yusufozturk.info
        http://twitter.com/yusufozturk
 
#>
 
[CmdletBinding(SupportsShouldProcess = $true)]
param (
 
	# Target Volume
	[Parameter(
		Mandatory = $true,
		HelpMessage = 'The CSV Volume name that you want to drain, like: Volume1')]
	$TargetVolume,
 
	# Filtered Volumes
	[Parameter(
		Mandatory = $false,
		HelpMessage = 'The CSV Volume names that you want to filter, like: Volume2')]
	[array]$FilteredVolumes,
 
	# Allow Passthrough Disks
	[Parameter(
		Mandatory = $false,
		HelpMessage = 'Allow Passthrough Disks')]
	[switch]$AllowPT = $false,
 
	# Debug Mode
	[Parameter(
		Mandatory = $false,
		HelpMessage = 'Debug Mode')]
	[switch]$DebugMode = $false
)
	# Enable Debug Mode
	if ($DebugMode)
	{
		$DebugPreference = "Continue"
	}
	else
	{
		$ErrorActionPreference = "silentlycontinue"
	}
 
	# Filtered Volumes
	$FilteredVolumes += $TargetVolume
 
	# Clear Query
	$Query = $Null;
 
	# Create Query
	foreach ($FilteredVolume in $FilteredVolumes)
	{
		$Query = $Query + ' Where {$_.SharedVolumeInfo.FriendlyVolumeName -notlike "*' + $FilteredVolume + '"} |'
	}
 
	# Full Query
	$FullQuery = '((Get-ClusterSharedVolume |' + $Query + ' Select -ExpandProperty SharedVolumeInfo | Select @{label="Name";expression={(($_.FriendlyVolumeName).Split("\"))[-1]}},@{label="FreeSpace";expression={($_ | Select -Expand Partition).FreeSpace}} | Sort FreeSpace -Descending)[0]).Name'
 
	# Get Cluster Nodes
	$ClusterNodes = Get-Cluster | Get-ClusterNode
 
	foreach ($ClusterNode in $ClusterNodes)
	{
		# Clear Variables
		$VMs = $Null;
 
		# Create VM Array
		$VMArray = @()
 
		if ($AllowPT)
		{
			# Get All Virtual Machines on Target Volume
			$VMs = Get-VM -ComputerName "$ClusterNode" | Where ConfigurationLocation -like "C:\ClusterStorage\$TargetVolume\*"
 
			foreach ($VM in $VMs)
			{
				# Get VM Information
				$VMName = $VM.Name
 
				# Add VM to VMArray
				$VMArray += $VMName
			}
		}
		else
		{
			# Get All Virtual Machines on Target Volume
			$VMs = Get-VM -ComputerName "$ClusterNode" | Where ConfigurationLocation -like "C:\ClusterStorage\$TargetVolume\*" | Where {($_ | Select -expand FibreChannelHostBusAdapters) -eq $Null}
 
			foreach ($VM in $VMs)
			{
				# Get VM Information
				$VMName = $VM.Name
 
				if ($VM.HardDrives.Path -like "Disk*")
				{
					# Skipping VM
				}
				else
				{
					# Add VM to VMArray
					$VMArray += $VMName
				}
			}
		}
 
		foreach ($VMName in $VMArray)
		{ 
			Write-Host " "
			Write-Host "Working on $VMName .."
			Write-Host "Hyper-V Host: $ClusterNode"
 
			# Get Volume Information
			$Volume = Invoke-Expression $FullQuery
 
			# Move Virtual Machine
			Move-VMStorage -ComputerName "$ClusterNode" -VMName "$VMName" -DestinationStoragePath "C:\ClusterStorage\$Volume\$VMName"
 
			Write-Host "Done."
		}
	}
}

It’s enough to run this script on one of the Cluster Node, so that will start migrating virtual machines. That will also give an output, so you will be able to see which VM you are migrating.

This is also an example how you can automate storage migrations:

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$Volumes = @()
$Volumes += "Volume1"
$Volumes += "Volume2"
$Volumes += "Volume3"
$Volumes += "Volume4"
$Volumes += "Volume5"
 
foreach ($Volume in $Volumes)
{
	Start-CSVMigration -TargetVolume "$Volume" -FilteredVolumes "Volume1","Volume2","Volume3","Volume4","Volume5","Volume6","Volume7","Volume8","Volume9","Volume10","Volume11","Volume12","Volume13","Volume14","Volume15"
}

I hope you will find it useful. See you!


Comments (1)

Yusuf Ozturk » How to replace an old Hyper-V CSV Storage with new one via PowerShell?

July 6th, 2014
11:38:07

[…] Update: This script is now a function called Start-CSVMigration, you can reach it from: http://www.yusufozturk.info/virtual-machine-manager/hyper-v-csv-migration-start-csvmigration.html […]



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