Backup job fail many times

[KROOKOO]

Hello!

I have Proxmox Virtual Environment 8.3.1 on two servers.
In both i have about 6-7 VM's.
This servers are clustered with qDevice.
I set SMB/CIFS storage for backup and create backup schedule everyday for all VM.
After ~3 months of use i see, that many backup will fail.
I have mail notification from backups and i see:
Status is OK, time are consumed, but size is 0.
When size is 0 (real file has about 50GB) backup cant be restored.

Any1 know what is wrong? If i good remember, in 90% cases only two VM's are failed.
Both with Windows Server 2022.

 

[fiona]

Hi,
could it be that your storage was (nealy) full? IIRC, CIFS has some very weird behavior then and doesn't properly report that as an error sometimes. Please share the output of pveversion -v, the full backup task log and the excerpt from the system logs/journal around the time the issue happened.

 

[KROOKOO]

Hello!
Thanks for fast response

Storage status is "24.98 TiB of 39.43 TiB".
Now in system log i see, that are problem with SMB connectivity, but im confused with that.
We have zabbix monitoring and i never loss communication to this storage device.
As i wrote in topic, I have scheduled backup two servers.
In some cases 5 VMs backup is succesfull, next one VM has error with unaccesible destination disk, and about 1-3 min later 2nd server start backups and destination is accesible.