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
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