sjesse
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Unmount and remount all datstores performance

Is there anyway to improve the speed for this. I'm using the unmount and mount functions from the below script. I'm trying to create something that will unmount all attached datastores revert each of those datastores to a snapshot on the storage and remount everything. This works but its a bit slow.

Automating Datastore/Storage Device Detachment in vSphere 5 - VMware vSphere Blog

function revert_netapp_snapshot

{

    param(

        $virtualMachine,

        $datastoreCluster

    )

    $currentSnapshot=''

    $msgBoxInput =  [System.Windows.MessageBox]::Show('Are you sure?This will disconnect all the Netapp Snapshot Dastores and restore them from the last snapshot','Snapshot Revert Confirmation','YesNoCancel','Error')

   

    switch  ($msgBoxInput) {

        'Yes' {

           $datastores=Get-Datastore -RelatedObject $datastoreCluster

           $vmlocation=$(Get-VM $virtualMachine | select Name,@{E={$_.ExtensionData.Config.Files.VmPathName};L=”VM Path”}).'VM Path'

           $esxi=$(Get-VM $virtualMachine).VMhost

          

           foreach($datastore in $datastores)

           {

                $poweredOnVms=Get-VM -Datastore $datastore | Where-Object {$_.PowerState -eq "PoweredOn"}

                foreach($vm in $poweredOnVms)

                {

                    while($vm.PowerState -eq "PoweredOn")

                    {

                    try{

                            Shutdown-VMGuest -VM $vm -Confirm $false -ErrorAction Stop

                            sleep 15

                        }catch{

                            

                            Stop-VM -VM $vm   

                            sleep 15

                        }

                    }

               

                }

          }

          Remove-VM -VM $virtualMachine

           foreach($datastore in $datastores)

           {

                $volume=$datastore.Name+"_vol"

                $snapshots=Get-NcSnapshot -SnapName $volume"*"

                if($snapshots.Count -gt 0)

                {

                    if($snapshots.Count -eq 1)

                    {

                       $currentSnapshot=$snapshots

                    }else{

                       $currentSnapshot=$snapshots[$snapshots.Count -1]

                    }

                }

                Restore-NcSnapshotVolume $volume $currentSnapshot.Name -Confirm:$false

               

           }

           foreach($datastore in $datastores)

           {

                   Write-Host "Mounting " $datastore

                   Mount-Datastore $datastore

              

           }

           New-VM -VMHost $esxi -VMFilePath $vmlocation

            break

            }

       

        'No' {

            break

        }

        'Cancel'{

            break

        }

  }

}

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3 Replies
LucD
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I would sooner investigate if the isn't a more general problem with the LUNs involved.
Do the datastore mounts from the Web Client faster?

Anything in the logs on path trashing, SCSI timeouts...?


Blog: lucd.info  Twitter: @LucD22  Co-author PowerCLI Reference

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sjesse
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The webclient is 4 times faster, about 10 minutes for 9 datstores to unmount and remount, vs 44 minutes to unmount and restore 9 datastores. I'll look at the logs but based on this I think its something in the code I wrote. I think I misunderstand the process block in powershell, I was hoping that would do the host unmounts asynchronously, but I think its doing the one at a time. I think I'll try adjust that unmount and mount functions to use jobs and then count the number of unmounting and mount events before reverting the lun snapshot. I'm pretty sure thats why its quicker in the webclient as I was firing the unmounts as fast as possible.

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LucD
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Afaik, there is no option to run the MountVmfsVolume method in a RunAsync modus.

I suspect the Mount-Datastore function you are using is trying to mount the datastore on each ESXi node on which the underlying LUN is visible.

That might be the difference between the function and the Web Client


Blog: lucd.info  Twitter: @LucD22  Co-author PowerCLI Reference

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