Then why go through all this trouble at all? 1. Build new RAIDZ2 pool with all your disks that you plan to use. 2. Restore backup to the new pool. I keep a ba

Then why go through all this trouble at all? 1. Build new RAIDZ2 pool with all your disks that you plan to use. 2. Restore backup to the new pool. I keep a backup too and so this is how I move to a new larger ZPOOL with a new layout. Either you have to do this because you don't have a backup, and so this is risky. Or you don't need to do this because you have a backup and can just build your new pool and restore your data from the backup.