Re: Balancing Disk Data Across Arms

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

At 08:05 AM 02/23/2000 -0600, you wrote:

Please go to V4R4.  DSKBAL does away (it kind of sucked anyway), and the 
new STRASPBAL and related commands are far superior.

Al



>
>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.
>
>Thanks
>
>Thomas A. Law Jr.
>
>Senior Systems Programmer
>Americas - MIS Tech Support
>NACCO Materials Handling Group
>1813 E. Voorhees St.
>Danville, IL. 61832
>Phone:  217-443-7622
>Fax:    217-443-7657
>Work E-mail:  ACTLAW@NMHG.COM <ACTLAW@NMHG.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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