> From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss- > boun...@opensolaris.org] On Behalf Of Tiernan OToole > > I have read something about trying to setup redundancy with the RAID > controllers, so having zpools spanning multiple controllers. Given I > won't be using the on-board RAID features of the cards, I am wondering > how this should be setup.
Option 1: Suppose you have controllers, A, B, C. Suppose you have 8 disks per controller, 0, 1, ..., 7 Configure your controller for JBOD mode (so the OS can see each individual disk) or configure each individual disk as a 1-disk raid0 or raid1, which is essentially the same as JBOD. Point is, the OS needs to see each individual disk. mirror A0 B0 C0 mirror A1 B1 C1 mirror A2 B2 C2 ... You will have the total usable capacity of 8 disks, and 16 disks redundancy. Option 2: raidz A0 B0 C0 raidz A1 B1 C1 raidz A2 B2 C2 ... You will have the total usable capacity of 16 disks, and 8 disks redundancy. Option 3: If you have any less than 8 disks redundancy, you won't be protected against controller failure. It's a calculated risk; a crashed controller would result in the zpool going offline, and probably an OS crash. I don't know the probability of data loss in that scenario, but I know none of this should be a problem if you *do* have the controller redundancy. _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
