Step 8: Mirror, Mirror
Disk Utility will show you two volumes under the four hard drives in the Volumes list. Click one (select the RAID tab if you're not already there) and give the new volume a name. Keep the Volume Format as Mac OS Extended (Journaled) and change the RAID Type pull-down to Mirrored RAID. Wondering about that RAID Mirror AutoRebuild setting (Options) from step 6? You can ignore it unless you're using removable drives for your RAID, in which case Disk Utility can automatically RAID up whenever you attach them. Click Create.
Now set one of the striped volumes to mirror the other—presto! Speed and redundancy!
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Anonymous
March 16, 2008 at 1:08pm
I can't seem to do this on my Feb 2008 Mac Pro. Do I need to first have the OS installed on an external drive or something? I can create the first striped array (even named it 'Ham'), but when I hit the '+' icon, and create the second array of striped drives, I can't drag the 3rd/4th drives over.
I can create a second set of striped drives, not using the '+' icon, but as a separate entity, and there doesn't appear to be a way to mirror the Ham array with it. I just wind up with two different arrays, and the OS can only be installed on one of them.
Thanks
Lou
March 20, 2008 at 2:57pm
Hello,
I installed 4 500gb drives last night in what I believe is a Raid 10,
it sounds like you didn't create the raid with all the drives in box, the have to arranged first then all created at the same time.
Here the Apple link that should help you.http://docs.info.apple.com/article.html?artnum=304377Good Luck,
Lou
Will
October 22, 2007 at 9:44am
You're right. According to a few articles, -one is here: http://www.miracleas.com/BAARF/RAID5_versus_RAID10.txt , the best hi perf raid to run is 10, which is in fact different from 0+1 http://www.bytepile.com/raid_class.php#10
iSean1
January 18, 2007 at 9:25pm
Reading your article I noticed that you striped Disk 1 and Disk 2 then striped Disk 3 and Disk 4 before mirroring the two striped volumes into a RAID volume.
I have seen performance tests that would indicate better performance may be achieved by mirroring Disk 1 and Disk 2 then mirroring Disk 3 and Disk 4 then striping the 2 mirrored volumes into a RAID volume.
What was the thought process on doing it the way you have outlined vs. the alternative method of mirroring then striping?
Would appreciate any insight into which is the better method and why.
iSean1
January 18, 2007 at 9:46pm
Sorry to post a reply to my own question but just trying clear up what I am asking a little. You list in your article that RAID 10 is a Mirror of Stripes, but isn't it in fact RAID 01 that is a Mirror of Stripes while RAID 10 is a Stripe of Mirrors?
The performance testing I have seen on RAID 01 (mirroring two sets of stripes) has been disappointing due to what would appear to be a flaw in Apples Software RAID which prevents i from performing stripe reads across a mirror.
From what I gather it has the same write speed and very little performance gain in read speed over RAID 10 (stripe of two sets of mirrors). This lack of performance gain combined with the fact that from what I understand is inferior fault tolerance seems to make it a poor choice over RAID 10 (striping two sets of mirrors).
That is what I am trying to figure out. What was the rationale for using/recomending RAID 01 vs. RAID 10?
