Backup with PBS datastore

[Alturing]

Hi,

I make packup vms on PBS datatore, but i have errors when i run job :
ERROR: VM 104 qmp command 'backup' failed - backup connect failed: command error: Input/output error (os error 5)
INFO: aborting backup job
INFO: stopping kvm after backup task
ERROR: Backup of VM 104 failed - VM 104 qmp command 'backup' failed - backup connect failed: command error: Input/output error (os error 5)
INFO: Failed at 2026-06-19 16:25:42
INFO: Backup job finished with errors
INFO: notified via target `mail-to-root`
TASK ERROR: job errors

on PBS, datastore is by a local directory by nfs mount NFS StoreEasy 1660 32TB SAS Storage

 

[TheGoat]

VM 104 qmp command 'backup' failed - backup connect failed: command error: Input/output error (os error 5)

A google search of this error will tell you exactly why it is failing.

 

[kawano-y]

Hi,

`Input/output error (os error 5)` usually indicates a possible I/O issue somewhere in the storage path.

Since your PBS datastore is on an NFS mount, could you please run the following commands on the PBS server and post the output?

mount | grep nfs
df -h
df -i
dmesg -T | tail -100
journalctl -b -p warning..alert

It may also be worth checking the NFS server logs around the time the backup failed.

Thanks.