Defines the total HD size to be used. This way you can save free
space on the HD(s) for further partitioning (e.g. for creating a swap-partition).
-`hdsize` is only honored for all bootable disks (i.e. only the first disk/mirror
-for RAID0/1/10, and all disks in RAID-Z[123]).
+`hdsize` is only honored for bootable disks, i.e., only the first disk or
+mirror for RAID0, RAID1 or RAID10, and all disks in RAID-Z[123].
ZFS Performance Tips