checking free space on datastore before doing svmotion

[hhub2]

I am in the process of trying to figure out how to check free space on the datastore before the svmotion proceeds.

Example:

- should pre-check to make sure that sizeof(VMs to move) < sizeof(destination) – 50GB before actually moving them

- should leave a 50GB buffer so the script terminates when all VM's are moved from source datastore or there is only 50GB remaining on source datastore

- should move VM's from source datastore to destination datastore 2 at a time until completed

- should create a local log file and then email this log file using smtp relay server.

I just started using powershell and have been playing with different things for about a week. I am trying to figure out the above problem, does anyone have any opinions or suggestions for me???

Any help would be greatly appreciated..

[esarakaitis]

you could pick your datastore using a little logic like:

get-datastore | ? {$_.capacitymb -gt "50000"}

http://www.vmwareadmins.com

http://www.vmwarescripting.com

[jeveenj]

Hi,

You can also try below code snippet, in this we are moving the VM to the specified DS depending on the condition (keeping 50 GB free space in DS)

Connect-VIServer <server> -user <user> -password <password>
$con = "y"
do
{
	if($con -eq "n")
	{
		break
	}
	$VMname = Read-Host "Enter the VM name to move"
	$DSname = Read-Host "Enter the DS name to which you want to move VM"
	$vm = Get-VM -Name $VMname|Get-View

	#calculating size of VM in GB
	$VMspace = "{0:n}" -f  ($vm.Summary.Storage.Committed / 1GB)

	#calculating size free space of DS 
	$DS = Get-Datastore -Name $DSname| Select-Object FreeSpaceMB
	$DSspace = "{0:n}" -f ($DS.FreeSpaceMB / 1024)
	if ($VMspace -le ($DSspace - 50))
	{
		Move-VM -VM (Get-VM -Name $VMname) -Datastore (Get-Datastore -Name $DSname)
	}
	else {"low space"
			break
		}
}while($con = Read-Host "to continue enter y else n" )
Write-Host "Process completed..."

Hope this help.

[hhub2]

Thanks, how would I take this and make it so I could move all VM's off a datastore 2 at time until completed or datastore FreeSpace is 50GB or less..?/

[jeveenj]

Hi,

I need few clarification, you want to move all the VMs of the datastore 2 to some other datastore (suppose datastore 3). The script should move all VM to datastore 3 or till the datastore space is equal or less than 50 GB. If so, you can try below code snippet

Connect-VIServer <server> -user <user> -password <password>

#getting all the VMs present in datastore 2
$vms = Get-VM -Datastore (Get-Datastore -Name "datastore 2")
$DSname = Read-Host "Enter the DS name where you want to move VMs"
foreach($vm in $vms)
{
	$vmm = $vm|Get-View
	
	#calculating size of VM in GB
	$VMspace = "{0:n}" -f  ($vmm.Summary.Storage.Committed / 1GB)
	
	#calculating size free space of DS 
	$DS = Get-Datastore -Name $DSname| Select-Object FreeSpaceMB
	$DSspace = "{0:n}" -f ($DS.FreeSpaceMB / 1024)
	if ($VMspace -le ($DSspace - 50))
	{
		Move-VM -VM (Get-VM -Name $VMname) -Datastore (Get-Datastore -Name $DSname)
		$i++
	}
	else {"low space"
			break
		}
}
if ($vms.Count -eq $i )
{
	"Process completed sucessfully"
}
else{"Unable to complete due to space constraint"} 

[hhub2]

Thats exactly what I looking to do, I will test this out later today and let you know how it went. Thank you.

[hhub2]

That's what I am looking to do, I will check this out.. Thank you...

[hhub2]

This is the error I am receiving when I run the script:

Cannot validate argument on parameter 'Name'. The argument is null or empty. Supply an argument that is not null or empty and then try the command again.

At :line:29 char:27

+ Move-VM -VM (Get-VM -Name <<<< $vmname) -Datastore (Get-Datastore -Name $DestinationDS)

thoughts??

[jeveenj · Accepted solution]

Hi,

Yes, the $vmname is empty, change the line as below

Move-VM -VM (Get-VM -Name $vmm.Name) -Datastore (Get-Datastore -Name $DSname)

[hhub2]

Thank you for the help... everything is working perfectly...