Unlike typical raid-5/6 parity, zfs / raidz doesn't require a format/parity initialization that writes all blocks of the disk before the pool can be used. You j

Unlike typical raid-5/6 parity, zfs / raidz doesn't require a format/parity initialization that writes all blocks of the disk before the pool can be used. You just need to write labels (at start & end of each disk) which is an attempt to confirm that the disk is actually as big as claimed.