On Fri, Mar 7, 2014 at 10:19 AM, Keith Wesolowski < [email protected]> wrote:
> On Thu, Mar 06, 2014 at 08:42:39PM +0000, Alex Adriaanse wrote: > > > Thanks, your email is incredibly helpful. As far as the raidz2 vdevs are > concerned, I keep reading on the Internet that for raidz2 you should have > an even number of disks. Is this valid advice? If so, what's the logic > behind this (or if it's not valid, why do people keep making this > recommendation)? > > I don't know. I've always taken these things to be cargo cult, but I'd > suggest you ask on one of the ZFS mailing lists or check their archives. > I can say that we haven't suffered any noticeable ill effects in our > configuration. > > There was this discussion on the ZOL list: https://groups.google.com/a/zfsonlinux.org/forum/#!topic/zfs-discuss/BO5vz2u3r7s I think a lot of the power of two plus parity "guideline" was regarding 4k/512 sector drives. That said (8+3)x3, 2 hot spares and a slog could work for a 36 bay RAIDZ3 system if you want to stick to the power of two guideline. Best bet is to performance test 9+2 vs 8+3 for your storage load. ------------------------------------------- smartos-discuss Archives: https://www.listbox.com/member/archive/184463/=now RSS Feed: https://www.listbox.com/member/archive/rss/184463/25769125-55cfbc00 Modify Your Subscription: https://www.listbox.com/member/?member_id=25769125&id_secret=25769125-7688e9fb Powered by Listbox: http://www.listbox.com
