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

["Al Barsa, Jr." <barsa2@xxxxxxx>]

At 02:50 PM 5/16/00 -0700, you wrote:

On model 600's and higher, you can protect the "load source drive" in a 
parity set.  Mirroring is no longer required.

Al - on the way to Grand Rapids


>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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Al Barsa, Jr. - Account for Midrange-L
Barsa Consulting, LLC.  
400 > 390

Phone:          914-251-1234
Fax:            914-251-9406
http://www.barsaconsulting.com
http://www.taatool.com
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