[PVE-User] Backup Failing sporadically due to "PBS backups are not supported by the running QEMU version"

[Fabian Grünbichler]

On February 5, 2021 10:43 am, Ralf Storm wrote:
> Hello,
> 
> 
> I have this Error first time ca. 2 weeks ago when backing up the biggest 
> of our 70 vms : "PBS backups are not supported by the running QEMU 
> version. Please make sure you've installed the latest version and the VM 
> has been restarted"
> 
> We have a Subscription and are on the newest updates.

that does sound rather strange. could you post the following information 
(feel free to censort parts you are not comfortable with sharing 
publicly)

pveversion -v
qm config XXX
qm status XXX --verbose

(where XXX is the VMID of the problematic VM)

journal output from around the attempted backup and the full backup task 
log would also be interesting.

> The only thing thats helps ist to shutdown the VM and reboot the whole 
> Node on which the VM is runninng. Shutdown, waiting for the quemu to 
> stop and then restart does not help, migrating to another Node does not 
> help. Shutdown and migrate to another Node does not help.

that sounds strange as well - a reboot of the node and a fresh start of 
the VM (via migration or shutdown and start) are equivalent w.r.t. what 
state of the old running VM is carried over..

> And this happens onyto this one VM, the other more than 70 VMs are not 
> affected.

what does biggest mean in the context of this node? biggest disk? 
highest memory? ... ?

thanks!