Hello,
couple of weeks ago, I set up PBS with Synology LUN according to this tutorial:
https://www.derekseaman.com/2025/08...-lun-for-proxmox-backup-server-datastore.html
It was definitely working back then.
To me, that seemed like a very plausible configuration, compared to some very finnicky NFS solutions I have seen out there.
And yesterday I suddenly discovered that it hasn't been working for a while now, basically I get from PVE a message that the LUN is read only.
Now, I know this is officially not supported, but this is a homelab, that means everything goes.
So, in short:
PBS can create a backup storage, and it also mounts it, creates the hidden folders, chunks, doesn't seem to be anything wrong.
But, in PVE, when I create a job on the datacenter level, it simply says it's read only. It does seem to write the vm folder and then the folder with ID of the VM, but nothing else.
To me it feels like a problem on the PVE side, but not sure.
In PVE, I use a user, which is a datastore admin on PBS, I have the correct fingerprint. And I have obviously set up PBS as a storage in PVE.
Yesterday I tried going from the scratch, meaning I deleted the whole LUN, rolled back the script on PBS, etc. No go.
Can anyone help me with this one?
And here is the log:
Thanks
couple of weeks ago, I set up PBS with Synology LUN according to this tutorial:
https://www.derekseaman.com/2025/08...-lun-for-proxmox-backup-server-datastore.html
It was definitely working back then.
To me, that seemed like a very plausible configuration, compared to some very finnicky NFS solutions I have seen out there.
And yesterday I suddenly discovered that it hasn't been working for a while now, basically I get from PVE a message that the LUN is read only.
Now, I know this is officially not supported, but this is a homelab, that means everything goes.
So, in short:
PBS can create a backup storage, and it also mounts it, creates the hidden folders, chunks, doesn't seem to be anything wrong.
But, in PVE, when I create a job on the datacenter level, it simply says it's read only. It does seem to write the vm folder and then the folder with ID of the VM, but nothing else.
To me it feels like a problem on the PVE side, but not sure.
In PVE, I use a user, which is a datastore admin on PBS, I have the correct fingerprint. And I have obviously set up PBS as a storage in PVE.
Yesterday I tried going from the scratch, meaning I deleted the whole LUN, rolled back the script on PBS, etc. No go.
Can anyone help me with this one?
And here is the log:
Code:
INFO: starting new backup job: vzdump 401 --mode snapshot --fleecing 0 --storage pbs --quiet 1 --notification-mode notification-system --notes-template '{{guestname}}'
INFO: Starting Backup of VM 401 (qemu)
INFO: Backup started at 2025-10-04 09:00:04
INFO: status = running
INFO: VM Name: debian-test-01
INFO: include disk 'scsi0' 'vm-disks:vm-401-disk-0' 4G
INFO: backup mode: snapshot
INFO: ionice priority: 7
INFO: creating Proxmox Backup Server archive 'vm/401/2025-10-04T07:00:04Z'
INFO: skipping guest-agent 'fs-freeze', agent configured but not running?
ERROR: VM 401 qmp command 'backup' failed - backup connect failed: command error: unable to create backup group "/mnt/synology/vm/401" - Read-only file system (os error 30)
INFO: aborting backup job
INFO: resuming VM again
ERROR: Backup of VM 401 failed - VM 401 qmp command 'backup' failed - backup connect failed: command error: unable to create backup group "/mnt/synology/vm/401" - Read-only file system (os error 30)
INFO: Failed at 2025-10-04 09:00:07
INFO: Backup job finished with errors
TASK ERROR: job errorsThanks
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