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:
- 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.
- 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.
- 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
- Select "Search"
- Type "BIOS 2.70" in the keywords box
- Select "Search"
- Select the Readme file associated with the "IBM ServeRAID
and ServeRAID II BIOS and Flash diskette version 2.70"
- Print out the contents for directions to apply the BIOS
update and Firmware Flash
- Select the "IBM ServeRAID and ServeRAID II BIOS and Flash
diskette version 2.70" to download (the diskette is a self-extracting
executable file that will create a bootable diskette)
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