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Use PowerShell to Migrate VMs to Home Server


Andrew Zbikowski1709159103

Question

Product Version: XenServer 7.1 LTSR Enterprise Edition with Cumulative Update 2 (Both XenServer pool and the XenServer SDK) 

 

What I'm trying to do is create a PowerShell script that will update the Homeserver (affinity) for each VM and then migrate the VM to that server. So far, setting the homeserver/affinity attribute has been no problem, but I haven't been able to figure out the migration command due to using local storage (no shared storage) in the XenServer pool.  

 

Based what I'm finding in the xe CLI help, I need to pass vdi:<source vdi uuid>=<dest sr uuid> in the options hashtable. 

# Get XenVM 
$XenVM = Get-XenVM -Name ExampleVM
# Get XenHost that is the Home Server. (Affinity) 
$XenHost = Get-XenHost -Name ExampleXenHost
# Get PBDs (Physical Block Device)
$XenHostPBDs = ($XenHost.PBDs | Get-XenPBD)
# Find the Local Storage SR, only one per server on our hardware. 
$HomeServerSR = ($XenHostPBDs.SR | Get-XenSR) | where{$_.name_label -match "local"}

So far, this all works. $HomeServerSR will be my local storage on the host I want to be the VM's home. Now I just need to get information on my VM's virtual disks... 

# Options Hashtable for Invoke-XenVM
$Options = @{
		"live"="true"
}
$VirtualDisks = Get-XenVDI -Name "$($XenVM.name_label)*" # This is nice, it returns an array for 1 or many results. Thank you XenServer SDK devs. 
ForEach ($VDI in $VirtualDisks) { 
	# Get the UUIDs for each virtual disk and add it to the $Options hashtable. 
	$Options.Add("vdi:$($VDI.uuid)","$($HomeserverSR.UUID)")
}
$Options

This also appears to be working. The contents of $Options looks like:

Name                           Value
----                           -----
live                           true
vdi:7964326e-...-...-a9a9... f093b11f-....-....-....-............

The UUIDs in the options hashtables match up with the virtual disk of my test VM and the destination SR. Things are looking good, use Invoke-XenVM to start the migration.

Invoke-XenVM -Name $XenVM.name_label -XenAction PoolMigrate -XenHost $XenHost.opaque_ref -Options $Options

Unfortunately this generates an error message. 

Invoke-XenVM : This VM needs storage that cannot be seen from that server
At line:1 char:1
+ Invoke-XenVM -Name $Xenvm.name_label -XenAction PoolMigrate -XenHost  ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Invoke-XenVM], Failure
    + FullyQualifiedErrorId : XenAPI.Failure,Citrix.XenServer.Commands.InvokeXenVM

Indicating that the VM needs storage that can't be seen from the destination server, though the options for specifying a storage change should be correct (I think.)

 

Again, this is migrating within the same pool but there is no shared storage, just local storage on each host that is a member of the pool. I'm stumped at what I'm missing or getting wrong. 

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Some progress. The xe CLI command would be: 

xe -s PoolMaster -u username -pw password -p 443 vdi-pool-migrate uuid=vDiskuuid sr-uuid=destinationSRuuid

Tested and verified. Trying to translate that into PowerShell:

$Options = @{
    "sr-uuid"="DestinationSRuuid"
}
Invoke-XenVDI -Uuid VirtualDiskUUID -XenAction PoolMigrate -Options $Options

Unfortunately that returns an error:

Invoke-XenVDI : There were no servers available to complete the specified operation.
At line:1 char:1
+ Invoke-XenVDI -Uuid uuid -XenAction PoolMigrate -Opt ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Invoke-XenVDI], Failure
    + FullyQualifiedErrorId : XenAPI.Failure,Citrix.XenServer.Commands.InvokeXenVDI

So close. Worst case I have to call xe.exe to do the migration. 

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