from Hyper-V

McHenry

Tried many times without success.

Exported vhdx from Hyper-V
Converted to VHD (Tried Powershell & StarWind)
Changed name to UUID name
Scan of disk fails

What am I missing?

Error:

sr.scan
{
  "id": "c8dc68cc-f065-f06f-9de1-946362817953"
}
{
  "code": "SR_BACKEND_FAILURE_40",
  "params": [
    "",
    "The SR scan failed  [opterr=uuid=25ab0e4d-a91d-4a19-964b-0f2b157818f8]",
    ""
  ],
  "task": {
    "uuid": "47ebf82e-0996-f107-f0f0-54c0c36d2416",
    "name_label": "Async.SR.scan",
    "name_description": "",
    "allowed_operations": [],
    "current_operations": {},
    "created": "20240929T09:59:42Z",
    "finished": "20240929T09:59:42Z",
    "status": "failure",
    "resident_on": "OpaqueRef:702151e8-1c6a-1208-4d10-e738b883cf1a",
    "progress": 1,
    "type": "<none/>",
    "result": "",
    "error_info": [
      "SR_BACKEND_FAILURE_40",
      "",
      "The SR scan failed  [opterr=uuid=25ab0e4d-a91d-4a19-964b-0f2b157818f8]",
      ""
    ],
    "other_config": {},
    "subtask_of": "OpaqueRef:NULL",
    "subtasks": [],
    "backtrace": "(((process xapi)(filename lib/backtrace.ml)(line 210))((process xapi)(filename ocaml/xapi/storage_access.ml)(line 36))((process xapi)(filename ocaml/libs/xapi-stdext/lib/xapi-stdext-pervasives/pervasiveext.ml)(line 24))((process xapi)(filename ocaml/libs/xapi-stdext/lib/xapi-stdext-pervasives/pervasiveext.ml)(line 39))((process xapi)(filename ocaml/xapi/message_forwarding.ml)(line 143))((process xapi)(filename ocaml/libs/xapi-stdext/lib/xapi-stdext-pervasives/pervasiveext.ml)(line 24))((process xapi)(filename ocaml/libs/xapi-stdext/lib/xapi-stdext-pervasives/pervasiveext.ml)(line 39))((process xapi)(filename ocaml/xapi/rbac.ml)(line 191))((process xapi)(filename ocaml/xapi/rbac.ml)(line 200))((process xapi)(filename ocaml/xapi/server_helpers.ml)(line 75)))"
  },
  "message": "SR_BACKEND_FAILURE_40(, The SR scan failed  [opterr=uuid=25ab0e4d-a91d-4a19-964b-0f2b157818f8], )",
  "name": "XapiError",
  "stack": "XapiError: SR_BACKEND_FAILURE_40(, The SR scan failed  [opterr=uuid=25ab0e4d-a91d-4a19-964b-0f2b157818f8], )
    at Function.wrap (file:///opt/xo/xo-builds/xen-orchestra-202409161442/packages/xen-api/_XapiError.mjs:16:12)
    at default (file:///opt/xo/xo-builds/xen-orchestra-202409161442/packages/xen-api/_getTaskResult.mjs:13:29)
    at Xapi._addRecordToCache (file:///opt/xo/xo-builds/xen-orchestra-202409161442/packages/xen-api/index.mjs:1041:24)
    at file:///opt/xo/xo-builds/xen-orchestra-202409161442/packages/xen-api/index.mjs:1075:14
    at Array.forEach (<anonymous>)
    at Xapi._processEvents (file:///opt/xo/xo-builds/xen-orchestra-202409161442/packages/xen-api/index.mjs:1065:12)
    at Xapi._watchEvents (file:///opt/xo/xo-builds/xen-orchestra-202409161442/packages/xen-api/index.mjs:1238:14)"
}

gskger

@McHenry Maybe this old post helps Error importing large vhd file. It also links to the documentation on how to Migrate to XCP-ng from Hyper-V, but I guess you already read that.

olivierlambert

A filename MUST be:

in the format <UUID>.vhd (you MUST have the .vhd extension!)
use dynamic VHD format

Vanny

If you have problem migrating from Hyper-V to XCP-ng with vhd importing, you can try Vinchin Backup & Recovery to perform a full machine migration.

olivierlambert

I'm fine with third-party vendors, but only when they are clearly identified as such. Only 2 posts to say the same thing with a specific UTM, that's really not great…

McHenry

@olivierlambert

We have a simplified process now.

Shutdown VM in Hyper-V
Convert VHDX to VHD using PowerShell
Move VHD to xcp-ng using SSH
Generate new name using uuidgen
Rename VHD
Create VM in XO and attach VHD

After much trial and error this works every time.

olivierlambert

Do you have the Powershell command to do this? We can use that to improve the current doc Or you can even send us a pull request directly @McHenry

McHenry

@olivierlambert

Convert-VHD -Path <source path> -DestinationPath <destination path> -VHDType Dynamic

Disk type is set by extension so ensure the destination path filename ends in ".vhd"

McHenry

@olivierlambert

Not sure how to send a pull request sorry.

olivierlambert

Don't worry, I'm adding @thomas-dkmt in the conversation so he can see how to update our doc for this

thomas-dkmt

@olivierlambert Thanks! I'll add it to the documentation.

thomas-dkmt

@McHenry I need some clarification on the exporting process in Hyper-V. Should the disk be converted prior to exporting, or the other way around?

McHenry

@thomas-dkmt

Either way.

If you can have the server offline then shutdown and create the VHD from the VHDX. The process creates another disk file so the original remains unchanged and if it all goes wrong you can simply restart the VM in Hyper-V and try again another day. You will need enough disk space for the original VM & the new VHD file.
If the server cannot be offline then export the VM and then convert the VHDX to VHD. The issue being the original will VM still be updated whilst the migration to xcp-ng takes place. You will need enough disk space for the original VM, the exported VM and the new VHD file.

McHenry

@thomas-dkmt

Our Hyper-V servers have no GUI and the process I use is:

RDP to the Hyper-V host
Open PowerShell
Get a list of the VMs on the host

    Get-VM

Stop the VM

    STOP-VM -Name <name of VM>

Identify the VM's disk(s) for conversion

    Get-VMHardDiskDrive -VMName <name of VM>

Convert the VHDX to VHD (destination file extension sets the type so use ".vhd")

    Convert-VHD -Path <source path> -DestinationPath <destination path> -VHDType Dynamic

To transfer the newly created .vhd files to xcp-ng we use Putty via the cli