> From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss- > boun...@opensolaris.org] On Behalf Of Peter Taps > > If I have 20 disks to build a raidz3 pool, do I create one big raidz > vdev or do I create multiple raidz3 vdevs? Is there any advantage of > having multiple raidz3 vdevs in a single pool?
whatever you do, *don't* configure one huge raidz3. Consider either: 3 vdev's of each 7-disk raidz1, or 3 vdev's of 7-disk raidz2, or something along these lines. Perhaps 3 vdev's of each 6-disk raidz1, and two hotspares. raidzN takes a really long time to resilver (code written inefficiently, it's a known problem.) If you had a huge raidz3, it would literally never finish, because it couldn't resilver as fast as new data appears. A week later you'd destroy & rebuild your whole pool. If you can afford mirrors, your risk is much lower. Because although it's physically possible for 2 disks to fail simultaneously and ruin the pool, the probability of that happening is smaller than the probability of 3 simultaneous disk failures on the raidz3. Due to smaller resilver window. I highly endorse mirrors for nearly all purposes. _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
