Ok, so , fresh install of proxmox 4.0 release, root on ZFS mirror.I tried to create a container, googled 'Warning, had trouble writing out superblocks', found a thread here, and remembered I had to create a zfs store on 3.4 too.So, I've created a 'ZFS' storage in the gui, picking "rpool" (though there's a couple of sub choices under that too), left things on default, has images and containers selected in 'use for'I create a VM, I can pick ZFS, it's all fine. If I create a CT, I can't pick ZFS as the storage - only local, which then fails.Any ideas?I also tried deselecting 'containers' as a type for 'local'. However, I can't - whenever I deselect and hit ok, it re-adds it the next time I look.