>Our thinking is that if you want more redundancy than RAID-Z, you should >use RAID-Z with double parity, which provides more reliability and more >usable storage than a mirror of RAID-Zs would.
This is only true if the drives have either independent or identical failure modes, I think. Consider two boxes, each containing ten drives. Creating RAID-Z within each box protects against single-drive failures. Mirroring the boxes together protects against single-box failures. >(Also, expressing "mirror of RAID-Zs" from the CLI would be a bit messy; >you'd have to introduce parentheses in vdev descriptions or something.) That doesn't sound so bad, actually. (An alternative would be to take the SVM approach and allow vdevs to be built up in multiple commands.) This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
