Re: Balancing disk drives

http://www-912.ibm.com/s_dir/slkbase.NSF/0/80a0c71876d5a872862567ca00770cb0?OpenDocument

Q: I have run TRCASPBAL and STRASPBAL *USAGE; however, my busy disk
drives are still busy. Why?
A: TRCASPBAL *USAGE will only move cold (unused) data. Hot (frequently
used) data is not moved by this option. If you have enough available
space in the ASP, you may wish to try draining the drive (STRASPBAL
*ENDALC and STRASPBAL *MOVDTA) to see if it alleviates the problem.
You may also want to try using iDoctor to trace the disk access to
determine which objects are being access and why which jobs/programs
to help determine another course of action.

HTH,
Charles


On Fri, Jul 29, 2011 at 8:05 AM, <rob@xxxxxxxxx> wrote:

The rebalance is finished.  I am NOT impressed.

07/28/11
09:57:37 - TRCASPBAL SET(*ON) ASP(1) TIMLMT(300)
09:58:36 - ASP tracing successfully started for ASP 1.
14:59:03 - ASP tracing for ASP 1 ended.
15:04:33 - STRASPBAL TYPE(*USAGE) ASP(1) TIMLMT(*NOMAX)
15:04:47 - ASP balancing successfully started for ASP 1.
18:20:26 - ASP balancing for ASP 1 ended.

07/29/11
07:47:46 - WRKDSKSTS

              Size    %     %
Unit  Type      (M)  Used  Busy
 ...
 14  433D   243252  73.7     8
 15  433D   243252  73.8    12
 16  433D   243252  73.8    16
 17  433D   243252  73.8     9
 18  433D   243252  73.8    10
 19  433D   243252  73.8    15
 20  433D   283794  71.9   100




Rob Berendt
--
Group Dekko
Dept 1600
Mail to:  2505 Dekko Drive
         Garrett, IN 46738
Ship to:  Dock 108
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From:   rob@xxxxxxxxx
To:     midrange-l@xxxxxxxxxxxx
Date:   07/28/2011 04:07 PM
Subject:        Balancing disk drives
Sent by:        midrange-l-bounces@xxxxxxxxxxxx



After the earlier add of a disk with the option to add unit and balance
data I decided to wait a day.  Then I ran TRCASPBAL.  When that was done I

fired off a STRASPBAL, this time with TYPE(*USAGE) instead of *CAPACITY
(used by Add units and balance data).  Apparently it's moving a lot around

from that one busy disk.  The rebalance is still running...

              Size    %       %
Unit  Type      (M)  Used    Busy
 ...
 14  433D   243252  74.1       1
 15  433D   243252  74.1       1
 16  433D   243252  74.1       3
 17  433D   243252  74.1       1
 18  433D   243252  74.1       1
 19  433D   243252  74.1       1
 20  433D   283794  72.2      60


Rob Berendt
--
Group Dekko
Dept 1600
Mail to:  2505 Dekko Drive
         Garrett, IN 46738
Ship to:  Dock 108
         6928N 400E
         Kendallville, IN 46755
http://www.dekko.com

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