Proxmox Backup VM on BOX

[Ldmit]

I make a backup to a network storage connected via CIFS with zstd compression mode and the backup will result in an error:

INFO: 99% (594.1 GiB of 600.0 GiB) in 1h 7m 40s, read: 152.0 MiB/s, write: 136.9 MiB/s INFO: 100% (600.0 GiB of 600.0 GiB) in 1h 8m 19s, read: 153.9 MiB/s, write: 136.7 MiB/s INFO: backup is sparse: 37.46 GiB (6%) total zero data INFO: transferred 600.00 GiB in 4099 seconds (149.9 MiB/s) zstd: /*stdout*\: Input/output error ERROR: Backup of VM 100 failed - zstd --rsyncable --threads=1 failed - wrong exit status 1 INFO: Failed at 2020-09-03 02:06:03 INFO: Backup job finished with errors

If you make backups of a smaller VM, everything goes well.

 

[fabian]

maybe they have some file size limit?

 

[Ldmit]

maybe they have some file size limit?

If I make a backup copy to the same network storage with the lzo compression ratio, then everything goes well. The file is larger than the size, which means there is not a limit on the file size.

Why does it fail with zstd compression?

 

[fabian]

I don't know.. I'd contact their support with detailed logs and timestamps, maybe they can help..

 

[Asano]

Resurrecting this thread: I'm seeing the exact same problem for backups on a hetzner storage box (BX50). Funnily the problem only occurs from one server, while backups from 3 other servers on the cluster to the same storage box never ever have a problem. Also noteworthy on average only 20%-30% of the VM backups on the problematic server fail and on some good days even on the problematic server all VM backups are correctly created.

The cluster is on the latest versions from the enterprise repo as of writing this but the first time I noticed the problem was with v 6.3-3 (maybe it was there even before but I didn't notice, for some reason the e-mail alert also isn't working in this case ).

Are there maybe other logs which could give more insight than the backup log with the zstd: /*stdout*\: Input/output error and exit status 1?