RE: Parity Set Configuration Advice

["Carl Galgano" <cgalgano2@xxxxxxxxxxxxxxxxx>]

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.
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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.