topic Re: Copy-NcHostFile with Ontap 9.8 error "SCSI command failed: Illegal request, ASC = 2" in Microsoft Virtualization Discussions

Copy-NcHostFile with Ontap 9.8 error "SCSI command failed: Illegal request, ASC = 2"

jjanssen1986 — Wed, 04 Jun 2025 10:40:04 GMT

Hello,

i would like to test Powershell Toolkit for copy Hyper-V vhdx files. I recive following error:

Copy-NcHostFile : SCSI command failed: Illegal request, ASC = 21, ASCQ = 0
At line:1 char:1
+ Copy-NcHostFile -SourceFile 'C:\ClusterStorage\svmhanhtphv11_lun101\VMs\MGMT01\M ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [Copy-NaHostFile], Exception
+ FullyQualifiedErrorId : System.Exception,DataONTAP.PowerShell.SDK.Cmdlets.Toolkit.Windows.CopyNaHostFile

Ontap 9.8

OS: Windows Server2012R2

Thx

Jan

Re: Copy-NcHostFile with Ontap 9.8 error "SCSI command failed: Illegal request, ASC = 2"

ChanceBingen — Mon, 04 Jan 2021 13:46:38 GMT

Hi, Jan. Can you check the space-allocation option on the LUN in ONTAP? It should be set to enabled.

Re: Copy-NcHostFile with Ontap 9.8 error "SCSI command failed: Illegal request, ASC = 2"

jjanssen1986 — Mon, 11 Jan 2021 07:31:48 GMT

We use a AFF220 there should space allocation disabled normaly for best deduplication.

Re: Copy-NcHostFile with Ontap 9.8 error "SCSI command failed: Illegal request, ASC = 2"

ChanceBingen — Mon, 11 Jan 2021 14:14:02 GMT

Yes, for sure you definitely want to keep everything thin to maximize your storage efficiency and immediately realize the space savings. However, the options can be very confusing sometimes.

The space-allocation LUN option doesn't affect deduplication, it has to do with accepting SCSI T-10 thin provisioning commands such as UNMAP and similar.

Re: Copy-NcHostFile with Ontap 9.8 error "SCSI command failed: Illegal request, ASC = 2"

jjanssen1986 — Mon, 11 Jan 2021 20:09:46 GMT

Hello,

thx for answer. Which Lun need to be space-allocation enable. Source or Destination ?

How can i verify this ?

Best Regards