Backup failed - Read only file system (os error 30)

[radiouser]

Hi there,

after restoring one VM with the backup server (luckily it worked perfect), I have now some troubles with creating a new backup (with all VM on the PVE).

I always get the following messages (also after updates, I tried to reboot,...):


Backup:

INFO: starting new backup job: vzdump 101 --notes-template '{{guestname}}' --mode snapshot --node proxmox --storage Backup --remove 0

INFO: Starting Backup of VM 101 (qemu)

INFO: Backup started at 2024-06-04 15:01:49

INFO: status = running

INFO: VM Name: WinDBSrv

INFO: include disk 'scsi0' 'local-lvm:vm-101-disk-0' 256G

INFO: include disk 'scsi1' 'Daten:vm-101-disk-0' 2580G

INFO: include disk 'scsi2' 'Daten:vm-101-disk-1' 700G

INFO: backup mode: snapshot

INFO: ionice priority: 7

INFO: creating Proxmox Backup Server archive 'vm/101/2024-06-04T13:01:49Z'

INFO: issuing guest-agent 'fs-freeze' command

INFO: issuing guest-agent 'fs-thaw' command

ERROR: VM 101 qmp command 'backup' failed - backup connect failed: command error: Read-only file system (os error 30)

INFO: aborting backup job

INFO: resuming VM again

ERROR: Backup of VM 101 failed - VM 101 qmp command 'backup' failed - backup connect failed: command error: Read-only file system (os error 30)

INFO: Failed at 2024-06-04 15:01:52

INFO: Backup job finished with errors

TASK ERROR: job errors

pveversion

pve-manager/7.4-18/b1f94095 (running kernel: 5.15.152-1-pve)

Does maybe somebody has any ideas? Do you need more infos?

 

[floh8]

so, what says the vm 101....changed the root filesystem to readonly?

 

[radiouser]

I am running four different VMs and I have the same problem with all of them.
Sorry for the stupid question, but I am relatively new in all of this, but inside the VMs I can read and write - so everythings works normal. Do you mean with "changed the root filesystem to readonly" the root filesystem of proxmox? I wouldn't know how to do or change that...

Could it be a problem, that one VM is the Backup Server - but saving the backups to an external NAS?

 

[fiona]

Hi,
please check the PBS server and whether the filesystem for the datastore is still writable.

 

[floh8]

Of course a vm readonly FS should PBS also backup.

 

[radiouser]

Ok, thanks for your help, I found the issue.
It was not a Proxmox problem, it was a problem with the NAS storage - now it is working again without problems. It was a coincidence, that the backup problem occurred at the same time after the restoring process.