RE: Change from mirroring to Raid 5 - Any Gotcha's

We have IBM come out and pay thru the nose for them to configure
raid/mirroring of the drives.  In theory by stopping the mirroring, of
course in DST after you have a complete backup, you will suddenly have lots
of unused dasd.  Don't forget to keep mirroring the load source drive.  Now
you know that only like drives can be mirrored and have planned out what
drive go into what raid set.  Just define your raid sets and your done.  But
you have these drives with lots of data and other drives with no data.  You
have lots of free space but no performance gain at this time.  Thank IBM
that you now have the STRASPBAL command or its replacement, ??, can't
remember the new version.  Once you have re-balance your drives you should
see a performance increase due to the number of arms working for you.  There
is some performance overhead on calculating the check sums but should be
done by the IOP.  The real Gotcha are going the other way.

Christopher K. Bipes     mailto:ChrisB@Cross-Check.com
Sr. Programmer/Analyst   mailto:Chris_Bipes@Yahoo.com
CrossCheck, Inc.         http://www.cross-check.com
6119 State Farm Drive    Phone: 707 586-0551 x 1102
Rohnert Park CA  94928 Fax: 707 586-1884

If consistency is the hobgoblin of little minds, only geniuses work here.
Karen Herbelin - Readers Digest 3/2000


-----Original Message-----
From: Carl Gerlach [mailto:cgerlach@execpc.com]
Sent: Tuesday, May 16, 2000 1:32 PM
To: MIDRANGE-L@midrange.com
Subject: Change from mirroring to Raid 5 - Any Gotcha's


Hi all:

I need to setup a step by step plan to take our production machine from
mirroring to Raid 5. The backup and recovery Guide explains how to perm end
mirroring, but what about Raid 5 setup? Anybody do this in the past? Any
suggestions, ideas or gotchas I should look out for?

Any assistance is greatly appreciated.

Thanks,

Carl Gerlach
cgerlach@apex-isg.com
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