LXC Backups getting stuck

Tmanok

Renowned Member
This has been an issue on a specific cluster of mine for quite some time and I'm still not sure why even after many updates, my LXC containers never backup (creating a backlog of backup tasks).

A scheduled backup, suspend or snapshot, to an NFS drive, will stall before it even begins while it is backing up an LXC. No further backups on the host continue because of the stall on the one host. It always stalls at a line like this:
Bash:
INFO: starting first sync /proc/1415/root/ to /mnt/pve/Backups/dump/vzdump-lxc-114-2021_09_14-04_26_37.tmp

The state of the LXC becomes locked and the backup never progresses past that point. Please help me identify the cause and a solution. I can't use "shutdown" because the LXCs run databases needed for other VMs.
Thanks.
 
Sounds like the NFS share does not work reliable. Any hints in the syslog (or the NFS server logs)?
 

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