The jumper may be moved at any time, but changes only take effect during a
system IPL.
Refer to the illustration below while changing the mode jumper.
1. Power off the system, ensuring that no jobs are currently processing. (See
″Starting and Stopping the System″ in the Information Center at
http://www.ibm.com/eserver/iseries/infocenter).
2. To set the mode of the card to Compressed (C), place the jumper on the top
and middle pins.
To set the mode of the card to Enhanced (E), place the jumper on the middle
and bottom pins.
3. Select the IPL type and mode (see iSeries Service Functions information).
4. Power on the system.
For information on disk compression, see the Backup and Recovery section of the
Information Center.
Mode jumper has been overridden
The error message CPPEA20 appears when the mode jumper has been overridden.
This is due to cache data that is in a conflicting mode.
To begin correcting this error, examine the mode jumpers in the rear section of the
storage I/O card.
Note: The mode jumper is accessible without requiring the removal of the I/O
card.
Data Recovery and General System Information
Chapter 6. Data Recovery Procedures and General System Information 935
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