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PERFORMANCE ENHANCEMENTS for SERVERAID I and II ADAPTERS



Subject: PERFORMANCE ENHANCEMENTS for SERVERAID I and II ADAPTERS
Updated PC Server RETAIN Tip: 

     Record number:       H163649
     Device:              D/T8640
     Model:               M
     Hit count:           UHC00005
     Success count:       USC0000
     Publication code:    PC50
     Tip key:             024
     Date created:        O98/05/11
     Date last altered:   A98/09/09
     Owning B.U.:         USA


Abstract: PERFORMANCE ENHANCEMENTS for SERVERAID I and II ADAPTERS


TEXT:


SYMPTOMS:

Slow performance of the ServeRAID I and II Disk subsystem.


FIX:

Performance enhancements for the ServeRAID I Adapter, ServeRAID II Adapter, and ServeRAID II Onboard Controller can be achieved (and not limited to) as follows:

  1.  The "IBM ServeRAID and ServeRAID II BIOS Flash Diskette  version 2.70 and later"* offers several performance  enhancements for RAID Levels 1, and 5 on the ServeRAID II Adapter.
  2.  Changing the Write Policy to Write-Back Mode will improve  performance for RAID Levels 0, 1, and 5 with RAID 5 yielding  the greatest performance of the ServeRAID II Adapter / Controller.

     Adjustment of the Write Policy will improve performance for  RAID Levels 0, 1, and 5 on the ServeRAID I and ServeRAID II Controller.

  3.  Selecting the optimum Stripe Unit size with respect to the  System I/O Request will maximize overall performance of the  ServeRAID I and ServeRAID II Controller.


Note: The Users Guide that shipped with the System or Option as well as the HMM (Hardware Maintenance Manual) for the System lists existing ways (to include item 2 and 3 above) to increase performance of the ServeRAID I and ServeRAID II Adapters and the Onboard ServeRAID II Controller.

Refer to the HMM (Hardware Maintenance Manual) P/N 10L9147, publication S10L-9147-00 for additional information on the ServeRAID I and ServeRAID II Controller.

* Note: The "IBM ServeRAID and ServeRAID II BIOS and Flash diskette version 2.70 or later" is available at the IBM Web Site at the following URL:

http://www.pc.ibm.com/us/files.html


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