On Fri, Mar 26, 2010 at 6:29 PM, Slack-Moehrle <mailingli...@mailnewsrss.com > wrote:
> > OK, so I made progress today. FreeBSD see's all of my drives, ZFS is acting > correct. > > Now for me confusion. > > RAIDz3 > > # zpool create datastore raidz3 da0 da1 da2 da3 da4 da5 da6 da7 > Gives: 'raidz3' no such GEOM providor > > # I am looking at the best practices guide and I am confused about adding a > hot spare. Wont that happen with the above command or do I really just zpool > create datastore raidz3 da0 da1 da2 da3 da4 da5 and then issue the hotspare > command twice for da6 and da7? > > -Jason > > ----- Original Message ----- > From: "Slack-Moehrle" <mailingli...@mailnewsrss.com> > To: zfs-discuss@opensolaris.org > Sent: Friday, March 26, 2010 12:13:58 PM > Subject: Re: [zfs-discuss] RAID10 > > > > >> Can someone explain in terms of usable space RAIDZ vs RAIDZ2 vs RAIDZ3? > With 8 x 1.5tb? > > >> I apologize for seeming dense, I just am confused about non-stardard > raid setups, they seem tricky. > > > raidz "eats" one disk. Like RAID5 > > raidz2 digests another one. Like RAID6 > > raidz3 yet another one. Like ... hmmmm... > > So: > > RAIDZ would be 8 x 1.5tb = 12tb - 1.5tb = 10.5tb > > RAIDZ2 would be 8 x 1.5tb = 12tb - 3.0tb = 9.0tb > > RAIDZ3 would be 8 x 1.5tb = 12tb - 4.5tb = 7.5tb > > But not really that usable space for each since the mirroring? > > So do you not mirror drives with RAIDZ2 or RAIDZ3 because you would have > nothing for space left.... > > -Jason > > Triple parity did not get added until version 17. FreeBSD cannot do raidz3. --Tim
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