Proxmox, ZFS: trouble witing out superblocks. Error 144

[^rooker]

[PROBLEM]
Spending yet-another-day, trying to setup a Proxmox server on Debian 8.
I've gotten quite far, but having LXC containers on ZFS storage doesn't work for me, since I've changed the mountpoint of ZFS to /mnt

Trying an evil workaround-hack, I've removed the ZFS-type storage for containers and replaced it with a directory-type storage.

Throws the following error when trying to create a container from template:

Warning, had trouble writing out superblocks.TASK ERROR: command 'mkfs.ext4 -O mmp -E 'root_owner=0:0' /mnt/tank/pve_data/containers/images/100/vm-100-disk-1.raw' failed: exit code 144

Seems that I'm stuck:
https://forum.proxmox.com/threads/proxm ... all.24217/

[gilthanaz]

Proxmox really feels very unstable/incomplete/incompatible compared to other VM Host solutions :/