On Fri, Aug 21, 2009 at 5:26 PM, Ross Walker <rswwal...@gmail.com> wrote:
> On Aug 21, 2009, at 5:46 PM, Ron Mexico <no-re...@opensolaris.org> wrote: > > I'm in the process of setting up a NAS for my company. It's going to be >> based on Open Solaris and ZFS, running on a Dell R710 with two SAS 5/E HBAs. >> Each HBA will be connected to a 24 bay Supermicro JBOD chassis. Each chassis >> will have 12 drives to start out with, giving us room for expansion as >> needed. >> >> Ideally, I'd like to have a mirror of a raidz2 setup, but from the >> documentation I've read, it looks like I can't do that, and that a stripe of >> mirrors is the only way to accomplish this. >> > > Why? > Because some people are paranoid. > > It uses as many drives as a RAID10, but you loose 1 more drive of usable > space then RAID10 and you get less then half the performance. > And far more protection. > > You might be thinking of a RAID50 which would be multiple raidz vdevs in a > zpool, or striped RAID5s. > > If not then stick with multiple mirror vdevs in a zpool (RAID10). > > -Ross Raid10 won't provide as much protection. Raidz21, you can lose any 4 drives, and up to 14 if it's the right 14. Raid10, if you lose the wrong two drives, you're done. --Tim
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