RE: Parity Set Configuration Advice

The 2757 controller can do parity sets of 3-18 drives.  At another job we
had one setup with 18 drives as the parity set, but our CE at the time
wasn't aware that it could be setup for capacity, performance, or balanced.
Now that I know there's a choice I want to make more of a decision on
it.... getting plenty of good feedback so far!




|---------+------------------------------->
|         |           "Carl Galgano"      |
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|         |           ting.com>           |
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|         |           midrange-l-bounces@m|
|         |           idrange.com         |
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|         |           04/20/2004 12:08 PM |
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|         |           Midrange Systems    |
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  |       Subject:  RE: Parity Set Configuration Advice                         
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Chad, I thought a raid set had to be at least 4 drives?  At least it used
to
be that way.  Has this changed?

Carl J. Galgano
EDI Consulting Services, Inc.
600 Kennesaw Avenue, Suite 400
Marietta, GA  30060
(770) 422-2995 - voice
(419) 730-8212 - fax
mailto:cgalgano@xxxxxxxxxxxxxxxxx
http://www.ediconsulting.com
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-----Original Message-----
From: ChadB@xxxxxxxxxxxxxxxxxxxx [mailto:ChadB@xxxxxxxxxxxxxxxxxxxx]
Sent: Tuesday, April 20, 2004 11:27 AM
To: midrange-l@xxxxxxxxxxxx
Subject: Parity Set Configuration Advice


Hello all... been reading forever and am posting the first time...

We will have 6 of the 36gb 15k RPM drives setup on a 2757 controller.  I'm
trying to decide what would be the 'best' way to configure them in terms of
parity sets.  Can anyone help me with the decision?  I'm picturing either 6
drives in a single parity set, or 2 parity sets of 3 drives each.  I'm
interested in getting some thoughts on which setup makes more sense in
terms
of protection and performance.  I know that by setting them up as 2 parity
sets of 3 drives we will lose more capacity, but I want to get some feeling
for how much additional performance or protection that setup might
offer compared to the 6 drives in one set.   Can anyone offer any further
advice?

The system is a 950cpw Model 800 that runs a single Domino workload (200
users max) and a Websphere workload.

Thanks for the help...


Chad Burrall


AS/400 Administrator


Wheeling-Nisshin, Inc.


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