v No: Contact your next level of support.
This ends the procedure.
Storage I/O card modes and jumpers
For use by authorized service providers.
The 2748 and 2778 I/O card can run in either compression mode or enhanced mode.
v Compression Mode: Compression mode should only be used when you want to run Integrated
Hardware Disk Compression. In compression mode, the write cache size is 4 MB.
v Enhanced Mode: Enhanced mode has an enhanced write cache size. In Enhanced mode, the write
cache size for the 2748 I/O Card is 26MB, and the maximum compressed write cache size for the 2778
I/O Card is 104MB. Enhanced mode also provides support for Extended Adaptive Cache (by attachment
of a read cache device) and Extended Adaptive Cache Simulator.
The following pages are included here:
v “Set or change the mode of an I/O card.”
v When an error regarding the mode of the storage I/O card appears, the error message indicates
whether the jumper is missing or overridden.
– If the error message is CPPEA20, the I/O card has overridden the mode set by the jumper. See
Mode jumper has been overridden.
– If the error message is CPPEA21, the I/O card has detected that the jumper is missing. See Mode
jumper is missing.
Set
or change the mode of an I/O card: For use by authorized service providers.
The 2748 and 2778 I/O card supports two modes: Compression and Enhanced. The rear of the I/O card is
marked with a C, indicating compression mode, and an E, indicating enhanced mode. Three pins on the
rear of the I/O card determine the mode of the card, depending on which of the pins have a jumper placed
on them.
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.
Figure 1. Changing the mode jumper
Analyze hardware problems 571
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