"device is busy" when trying to destroy a zpool : zfs
www.reddit.com › r › zfsIt's Ubuntu 14.04. make it unbusy. Something is using the pool. For example, NFS or SMB server. Or a user is sat in a directory in the pool (in a terminal). You could try lsof on each directory in ZFS to see what PID is using it. Or just reboot the system if that is an option. or fuser on the file system mount points.