I'm not sure if this helps, but I had the same issue as you Kalzaus, only VM's on one node had problems. I rebooted that node after hours and the VM's are running fine, including backups.
We have the same issue on one node in our cluster. The backup fails on all VM's on that node. I was going to reboot the node, but the running VM's will not migrate throwing this error:
Our VM's are currently using qcow2 on NFS storage.
All nodes of the cluter are runnning...
After searching the forums and internet for possible solutions I thought I would ask the Forums to see if anyone else has an idea.
I have setup a small cluster on new hardware SuperMicro servers, Motherboard H11DSU-iN:
AMD Epyc processors, 256GB ram each, 10SSD's
I have installed Proxmox 5.3...
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