Performance Impact of going from 2 parity drives to 4 parity drives in a 4-disk RAID set -- MIDRANGE-L

Subject: Performance Impact of going from 2 parity drives to 4 parity drives in a 4-disk RAID set
From: "Charles Wilt" <charles.wilt@xxxxxxxxx>
Date: Thu, 21 Aug 2008 15:08:30 -0400
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All,

related to my post about starting/stopping RAID....

The reason for stopping/starting RAID is to spread out the parity
information from the current 2 drives to all 4 drives in a 4-disk RAID
set.

However, one of the team members on the system admin team mentioned
that he was told, by IBM, there would be no noticable performance
impact of moving from 2 parity drive to 4 in a 4-disk RAID set.

Both of us find that surprising.

Does anybody have any first hand expirence to confim or deny this claim...

Thanks,

Charles Wilt

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Follow-Ups:

Re: Performance Impact of going from 2 parity drives to 4 parity drives in a 4-disk RAID set , Raul A. Jager W.

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