Re: Balancing Disk Data Across Arms

[Mike.Barton@xxxxxxxxxxxx]

I havn't actually used DSKBAL on V4R2 but the simple way to check your
disks is to do a DSPSKSTS command.

This details disk size, % used and if u press F5, also shows % busy.

Mike

>Has anyone used the DSKBAL command provided by IBM on a 4.2 system?
>This function is available via PTF.
>
>We run some accounting Monthend jobs that are heavy I/O.  When these
>jobs run, other batch jobs slow down (other batch jobs are actively
>running) and show I/O waits in  Performance Tools.>
>
>In the past year, we have added several disk drives to this system.
>Generally, 1 or 2 at a time.  I believe what has happened is that since
>these drives are empty when they are added, the IBM algorithm for
>spreading data across arms actually fills these empty drives until the
>percentage used is even again across all arms.  Thus, restoring or
>copying files in production applications actually put this data on
>these empty drives.  (timing)    I can see in performance tools that
>during the Monthend process, 4 or 5 arms will exceed the guidelines for
>the device.  These are the where the accounting data is located.
>
>Without doing a full SAVSYS and RESTORE (option 21),  The Support Center
>told me to install this PTF and use the DSKBAL command.
>
>Any help would be greatly appreciated.



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