Backup of VM failed - CT is locked (snapshot-delete)

Clive Austin

Active Member
Mar 14, 2017
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Hi,

I always run an automated proxmox backup to NFS storage on Friday nights ...but this morning, I'm seeing multiple backup failures in the form:

"ERROR: Backup of VM xxx failed - CT is locked (snapshot-delete)"​

It's interesting to note that this error has only affected my 3 largest CTs (spread over 2 different PM nodes) - whilst each of the smaller CTs (and all VMs) have been backed up normally. It *feels* like the problem might just be a bogus error message. It may be some kind of timeout dependency because of the size of these CTs. Anyway, I'm currently in the process of manually backing up the 3 failed CTs via PVE GUI - and so far that is working perfectly ...so go figure, eh?!

Just wondering wether anyone else has similar experience? Anyone have advice on how to adjust timeouts in the automated backup script?
 
probably there was just an 'snapshot deletion' active, if that was the case, the backup cannot start