> I also have two trivial questions (just to be sure). > Do the disks have to be equal in size for RAID-Z?
Not really. But just like most raid5 implementations, only the amount of space on the smallest disk (or other storage object) can be used on all the components. The extra space on the other objects will not be used. So if one disk is much smaller than the others, you lose a lot of space. 400, 400, 450 => 3x400 => 1200 raw before overhead (lose 50 of 1250 avail) 100, 400, 450 => 3x100 => 300 raw before overhead (lose 650 of 950 avail) > In a three disks RAID-Z, can I specify which disk to use for parity? No. Even in raid-5, there is no single parity disk. The parity is spread throughout the disks. In raidz, there is also no single disk dedicated to parity. As each write occurs, it will place data and parity blocks on disk, but it will not try to place parity on any disk in particular (it will just make sure that it is different from the location holding the data). -- Darren Dunham [EMAIL PROTECTED] Senior Technical Consultant TAOS http://www.taos.com/ Got some Dr Pepper? San Francisco, CA bay area < This line left intentionally blank to confuse you. > _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
