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Mirroring and Striping 4 Drives on 2 Controllers.
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Damian Menscher
*nix forums beginner


Joined: 17 Apr 2005
Posts: 20

PostPosted: Wed Feb 22, 2006 7:56 pm    Post subject: Re: Mirroring and Striping 4 Drives on 2 Controllers. Reply with quote

Brent L. Bates <blbates@vigyan.com> wrote:
Quote:
I'm planning on mirroring and striping 4 drives on 2 controllers. I've
never done striping before, but have done mirroring with 2 drives on the same
controller. Anyone have any suggestions on the best way to do this? Do I
mirror on the same controller or across controllers? What order are things
done? Stripe the drives and mirror the stripes or mirror the drives and
stripe the mirrors? Any and all suggestions greatly appreciated. Thanks.

My comments will assume a goal of maximum redundancy; if your goal is
speed these comments may not apply.

I'd recommend mirroring across controllers, so if you lose a controller
you don't lose the array.

It's safest to do the mirror first, then the stripe. That allows you
to lose two drives as long as they're in different mirrors. If you
were to stripe first, you could only lose one drive.

The thing you're after is called raid 10 (1+0) if you want to google
for more information.

I hope this helps... I owe you several.

Damian Menscher
--
-=#| Physics Grad Student & SysAdmin @ U Illinois Urbana-Champaign |#=-
-=#| 488 LLP, 1110 W. Green St, Urbana, IL 61801 Ofc:(217)333-0038 |#=-
-=#| 4602 Beckman, VMIL/MS, Imaging Technology Group:(217)244-3074 |#=-
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-=#| The above opinions are not necessarily those of my employers. |#=-
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Brent L. Bates
*nix forums beginner


Joined: 05 Aug 2005
Posts: 12

PostPosted: Wed Oct 19, 2005 12:55 pm    Post subject: Mirroring and Striping 4 Drives on 2 Controllers. Reply with quote

I'm planning on mirroring and striping 4 drives on 2 controllers. I've
never done striping before, but have done mirroring with 2 drives on the same
controller. Anyone have any suggestions on the best way to do this? Do I
mirror on the same controller or across controllers? What order are things
done? Stripe the drives and mirror the stripes or mirror the drives and
stripe the mirrors? Any and all suggestions greatly appreciated. Thanks.

--

Brent L. Bates (UNIX Sys. Admin.)
M.S. 912 Phone:(757) 865-1400, x204
NASA Langley Research Center FAX:(757) 865-8177
Hampton, Virginia 23681-0001
Email: B.L.BATES@larc.nasa.gov http://www.vigyan.com/~blbates/

Under US Code Title 47, Sec.227(b)(1)(C), Sec.227(a)(2)(B)
This email address may not be added to any commercial mail list with out
my permission. Violation of my privacy with advertising or SPAM will
result in a suit for a MINIMUM of $500 damages/incident, $1500 for repeats.
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