There is a similar and newer topic here.
This problem occurs when creating a backup with big disk space. It depends with ballooning. I'm still investigating how to resolve it but it seems to me, it's necessary to disable ballooning on VM.
Ok thanks a lot for the info. Can I ask why do you suggest the 8k for RAID-10 and 16k for RAIDZ1. How are you calculating it?
If I change this now new virtual machines will use the new values correct? I can backup/restore the existing ones at a...