# Pastebin Sr2psGS8
kinghat@kinghat:~$ sudo zpool create -O compression=on data mirror sda sdb
invalid vdev specification
use '-f' to override the following errors:
/dev/sda contains a filesystem of type 'ddf_raid_member'
/dev/sdb contains a filesystem of type 'ddf_raid_member'
kinghat@kinghat:~$