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Yes your performance will increase significantly. WRKDSKSTS and see
what the % busy is for the drives. If it is way out of balance, then
you will notice the change. If not, don't bother.
Chris Bipes
Director of Information Services
CrossCheck, Inc.
-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Charles Wilt
Sent: Thursday, August 21, 2008 1:06 PM
To: Midrange Systems Technical Discussion
Subject: Re: Performance Impact of going from 2 parity drives to 4
paritydrives in a 4-disk RAID set
No.
It's already a RAID 5, it will continue to be RAID 5.
Originally, it was a 3-disk RAID 5. Thus parity info was only on two
disks.
We added a 4th disk, but the OS does not automatically change the number
of disks used for parity data.
If you were to create a 4 disk RAID 5 array from scratch, parity would
be spread across all 4 disks.
So the question is is it worth the trouble of going into DST to stop and
restart RAID 5 in order to get the OS to spread the parity across all 4
disks instead of just 2 disks.
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