[PVE-User] backup to PBS: unable to acquire lock on snapshot directory

[PVE-User] backup to PBS: unable to acquire lock on snapshot directory

[Stephane Caminade]

Hello,

I have a question regarding a problem I encounter when running backups 
with PBS.

*Context*:

A cluster of 9 Proxmox nodes running 84 VM, and backing up to a remote PBS

*Versions*:

pve-manager/6.4-13/9f411e79 (running kernel: 5.4.128-1-pve) with 
proxmox-backup-client 1.1.12-1

proxmox-backup-server 2.0.10-1 running version: 2.0.9

*Problem*:

Regularly, some of my VMs (3 regularly, and others randomly - or I have 
not yet determined the common factor -) will fail their backup with the 
following error (example of a regular failing one, but similar message 
for all the failed backups):

/ERROR: Backup of VM 297 failed - VM 297 qmp command 'backup' failed - 
backup connect failed: command error: unable to acquire lock on snapshot 
directory "/mnt/inf-proxmox-bkp/PBS-STORAGE/vm/297/2021-09-29T10:01:43Z" 
- base snapshot is already locked by another operation/


Any pointers as to where I could look for the source of this problem?

Best regards,

Stephane

Re: [PVE-User] backup to PBS: unable to acquire lock on snapshot directory

[Stéphane Caminade]

Hi,

No one has encountered a similar problem?

Cheers,

Stephane

Le 29/09/2021 à 17:34, Stephane Caminade a écrit :
> Hello,
>
> I have a question regarding a problem I encounter when running backups 
> with PBS.
>
> *Context*:
>
> A cluster of 9 Proxmox nodes running 84 VM, and backing up to a remote 
> PBS
>
> *Versions*:
>
> pve-manager/6.4-13/9f411e79 (running kernel: 5.4.128-1-pve) with 
> proxmox-backup-client 1.1.12-1
>
> proxmox-backup-server 2.0.10-1 running version: 2.0.9
>
> *Problem*:
>
> Regularly, some of my VMs (3 regularly, and others randomly - or I 
> have not yet determined the common factor -) will fail their backup 
> with the following error (example of a regular failing one, but 
> similar message for all the failed backups):
>
> /ERROR: Backup of VM 297 failed - VM 297 qmp command 'backup' failed - 
> backup connect failed: command error: unable to acquire lock on 
> snapshot directory 
> "/mnt/inf-proxmox-bkp/PBS-STORAGE/vm/297/2021-09-29T10:01:43Z" - base 
> snapshot is already locked by another operation/
>
>
> Any pointers as to where I could look for the source of this problem?
>
> Best regards,
>
> Stephane
>
>
> _______________________________________________
> pve-user mailing list
> pve-user@lists.proxmox.com
> https://lists.proxmox.com/cgi-bin/mailman/listinfo/pve-user
>

Re: [PVE-User] backup to PBS: unable to acquire lock on snapshot directory

[Dietmar Maurer]

> No one has encountered a similar problem?

I guess I also saw this when running sync jobs and backups in parallel.
Do you run any sync jobs during backup?