Yes, XVAs.

XO tried to restore VM from that backup but failed with the error IMPORT_ERROR_PREMATURE_EOF().

Hi,

I tried to run a full backup of a large VM but I cancelled the [XO] VM export task half way (from the Tasks page). Even though the backup was not completed successfully as it exported only about 50% of VM, XO marked backup as successful. It seems like a bug in the XO, could you please help with that?

Cheers,
Michal

So far, I noticed this problem for three VMs. Each time I am trying to perform a backup with zstd compression through XO, the backup is marked as successful, but output XVA file is damaged (incomplete). The backup works fine for all other VMs, and I cannot pinpoint what is special about these faulty VMs.

Manual import of the backup does not work, it finishes with the same error.

# xe vm-import (...)
The VM could not be imported; the end of the file was reached prematurely.

Export of VM snapshot directly with xe works fine. The output file size was ~700GB.
I used the following commands:

# xe template-param-set is-a-template=false uuid=snapshoot_UUID
# xe vm-export filename=filename.xva vm=snapshoot_UUID compress=zstd
Export succeeded

Hi,

I am trying to do a backup of relatively large VM (~1TB) with ZSTD compression, it shows that backup is successful and there is no errors in XOA log files:

 Snapshot 
Start: Nov 3, 2020, 03:12:05 PM
End: Nov 3, 2020, 03:12:11 PM
 local_storage 
 transfer 
Start: Nov 3, 2020, 03:12:11 PM
End: Nov 3, 2020, 04:27:34 PM
Duration: an hour
Size: 103.3 GiB
Speed: 23.39 MiB/s
Start: Nov 3, 2020, 03:12:11 PM
End: Nov 3, 2020, 04:27:34 PM
Duration: an hour
Start: Nov 3, 2020, 03:12:05 PM
End: Nov 3, 2020, 04:38:47 PM
Duration: an hour

but when I am trying to restore it, it fails:

IMPORT_ERROR_PREMATURE_EOF()
This is a XenServer/XCP-ng error

The same backup without compression works fine, and it takes 10x more space.
I use XCP-NG 8.1 and xo-server 5.70.0, xo-web 5.74.0.

It looks like some issue of XAPI with VM export/compression. Has anyone run into a similar issue?