The issue is a bit old now but I will write about it anyway. It all begins with a hyper-v 2012 and a Equalogic San. And live storagemigration. With ODX enabled (default setting) the VHD:s was corrupted when moved. Which caused a lot of lost data.
The problem should with ODX and Hyper-V 2012. ODX is mentioned in following 2796995 which is replaced by 2870270.
The solution for this customer was to disable ODX. This was done by setting the “hklm:systemcurrentcontrolsetcontrolfilesystemFilterSupportedFeaturesMode” to “1”
(from Deploy Windows Offloaded Data Transfers)
Set-ItemProperty hklm:SYSTEMCurrentControlSetControlFile System -Name "FilterSupportedFeaturesMode" -Value 1
To test that all hosts was ODX-disabled and also do some performance testing I created a script to move a VM to all Hyper-V hosts in the cluster and move the VM to different LUNs.
The script below takes a VM (VirtualMachineName) and gets all hosts that matches the cluster “clusterName”. After that the VM is moved to the first Hyper-V host. The storage is moved to “ClusterStorage-Volume9” and back to Volume1. After that the the VM is moved to another host.
$vm = Get-SCVirtualMachine -Name "VirtualMachineName" $logPath = "C:tempMoveDiskTest.log" Add-Content $logPath ("Change to VM: $vm.name ") $hyperVhosts = Get-VMHost | where { $_.Hostcluster -match "clusterName"} foreach ($hyperVhost in $hyperVhosts) { $hostname = $hyperVhost.name Add-Content $logPath ("Moving to host: $hostname") $vmHost = Get-SCVMHost | where { $_.Name -eq $hostname } $status = Move-SCVirtualMachine -VM $vm -VMHost $vmHost -HighlyAvailable $true Add-Content $logPath ("Moving to LUN: Volume9") Move-SCVirtualMachine -VM $vm -VMHost $vmHost -Path "C:ClusterStorageVolume9" -UseLAN Add-Content $logPath ("Moving to LUN: Volume1") Move-SCVirtualMachine -VM $vm -VMHost $vmHost -Path "C:ClusterStorageVolume1" -UseLAN }
If there is some problems with the ODX the server will be corrupt. Please do this with a test-server.
The server that are moved to different storage needs to be powered on.