A small “bugfix” on proxmox 4.1 with ZFS below it, on a clean┬áinstall, proxmox will fail to make a lxc (linux container). One has to create a zfs storage before containers can be made … The error during creation:

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

The solution :
Datacenter -> Add ZFS
– id : whatever
– zfs pool : I took rpool/ROOT but you are free in this as far as I could see
– I did not restrict nodes, although I would not use it other then local.
– Enable : on
– Thin provision : no clue, I left it unmarked.

Then during the lxc creation select lxc_storage (this is the id you gave)

// update 7/04/2017

  • When importing from console :
    pct restore $container_id container.tar.lzo -storage lxc_storage