RDM Disk with Multiwriter

[Pilu1978]

Guys,

I have a requirement to add LUN's as RDM disks in Physical mode and shared (multiwriter) between two VM's using powercli. I have device WWN (naa.id) of the LUNs.

While adding the RDM's, disks would maintain the sequence of the SCSIID as below:

Hard Disk 2: SCSI 0:1

Hard Disk 3: SCSI 0:2

Hard Disk 4: SCSI 0:3

Hard Disk 5: SCSI 0:4

...

Please help.

[LucD]

Didn't you ask that same question 2 years ago?

Multiwriter Disk

[Pilu1978]

Hi LucD,

Yes but the requirements are different. Previous one was for normal virtual disk but this is for RDM disk in physical mode.

Sorry not sure how to add RDM disk with its naa id as shared disk between 2 VM's.

[LucD · Accepted solution]

It is basically the Backing of the disks tat changes.

Something like this

$vmNames = 'VM1','VM2'

$diskNAA = @('naa.600098764dc75adc8a8545aa41234567','naa.600098764dc75adc8a8545aa41234568')

$nrDisk= $diskNAA.Count

$diskUnitNr = 1..($nrDisk) | where{$_ -ne 7}

$nrDB = 1

$vm = Get-VM -Name $vmNames[0]

$scsi = Get-ScsiController -VM $vm -Name 'SCSI controller 0'

$scsiBus = $scsi.ExtensionData.BusNumber

$scsiKey = $scsi.Key

$spec = New-Object VMware.Vim.VirtualMachineConfigSpec

for($db = 1; $db -le $nrDB; $db++){

   if($db -gt 1){

   $scsiBus = $scsiBus + 1

   $scsiKey = -(200 + $db)

   $dev = New-Object VMware.Vim.VirtualDeviceConfigSpec

   $dev.Operation = [VMware.Vim.VirtualDeviceConfigSpecOperation]::add

   $controller = New-Object VMware.Vim.ParaVirtualSCSIController

   $controller.Key = $scsiKey

   $controller.BusNumber = 1

   $dev.Device = $controller

   $spec.DeviceChange += $dev

   }

   for($hd = 1;$hd -le $nrDisk; $hd++){

   $dev = New-Object VMware.Vim.VirtualDeviceConfigSpec

   $disk = New-Object VMware.Vim.VirtualDisk

   $back = New-Object VMware.Vim.VirtualDiskRawDiskMappingVer1BackingInfo

   $back.CompatibilityMode = 'physicalMode'

   $back.FileName = ''

   $back.DiskMode = [VMware.Vim.VirtualDiskMode]::independent_persistent

   $back.Sharing = [VMware.Vim.VirtualDiskSharing]::sharingMultiWriter

   $back.DeviceName = "/vmfs/devices/disks/$($diskNAA[$hd - 1])"

   $disk.Key = -($db * 100 + $hd)

   $disk.ControllerKey = $scsiKey

   $disk.UnitNumber = $diskUnitNr[$hd - 1]

   $disk.Backing = $back

   $dev.Operation = [VMware.Vim.VirtualDeviceConfigSpecOperation]::add

   $dev.FileOperation = [VMware.Vim.VirtualDeviceConfigSpecFileOperation]::create

   $dev.Device = $disk

   $spec.DeviceChange += $dev

   }

}

$vm.ExtensionData.ReconfigVM($spec)

$hdNames = Get-VM -Name $vmNames[0] | Get-HardDisk | where{$_.Name -ne 'Hard disk 1'} | Select -ExpandProperty FileName

$vm = Get-VM -Name $vmNames[1]

$scsi = Get-ScsiController -VM $vm -Name 'SCSI controller 0'

$scsiBus = $scsi.ExtensionData.BusNumber

$scsiKey = $scsi.Key

$spec = New-Object VMware.Vim.VirtualMachineConfigSpec

for($db = 1; $db -le $nrDB; $db++){

   if($db -gt 1){

   $scsiBus = $scsiBus + 1

   $scsiKey = -(200 + $db)

   $dev = New-Object VMware.Vim.VirtualDeviceConfigSpec

   $dev.Operation = [VMware.Vim.VirtualDeviceConfigSpecOperation]::add

   $controller = New-Object VMware.Vim.ParaVirtualSCSIController

   $controller.Key = $scsiKey

   $controller.BusNumber = 1

   $dev.Device = $controller

   $spec.DeviceChange += $dev

   }

   for($hd = 1;$hd -le $nrDisk; $hd++){

   $dev = New-Object VMware.Vim.VirtualDeviceConfigSpec

   $disk = New-Object VMware.Vim.VirtualDisk

   $back = New-Object VMware.Vim.VirtualDiskRawDiskMappingVer1BackingInfo

   $back.FileName = $hdNames

   $back.DiskMode = [VMware.Vim.VirtualDiskMode]::independent_persistent

   $back.Sharing = [VMware.Vim.VirtualDiskSharing]::sharingMultiWriter

   $disk.Key = -($db * 100 + $hd)

   $disk.ControllerKey = $scsiKey

   $disk.UnitNumber = $diskUnitNr[$hd - 1]

   $disk.Backing = $back

   $dev.Operation = [VMware.Vim.VirtualDeviceConfigSpecOperation]::add

   $dev.Device = $disk

   $spec.DeviceChange += $dev

   }

}

$vm.ExtensionData.ReconfigVM($spec)

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[Pilu1978]

Perfect. Thanks LucD.

[someo]

Hi,

Thanks for your solution, but I get the following error, can you help me?

Exception calling "ReconfigVM" with "1" argument(s): "Invalid configuration for device '0'."
At line:44 char:1
+ $vm.ExtensionData.ReconfigVM($spec)
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [], MethodInvocationException
+ FullyQualifiedErrorId : VimException



and line 44 refers to: $vm.ExtensionData.ReconfigVM($spec)