pSeries 7311 Model D20 Overview
The Model D20 is a 19-inch, rack-mountable I/O subsystem that is attached to a
processor subsystem to extend the system’s capacity for I/O adapters and disk drives.
The I/O subsystem includes redundant concurrently maintainable power and cooling.
Seven PCI slots are available for PCI adapters. Because the PCI slots support
hot-pluggable adapters, the I/O subsystem can have adapters installed without turning
off power. The Model D20 is 4 EIA units high and and compatible with 19-inch EIA rack
enclosures.
Model D20 I/O Subsystem Features
The features of the Model D20 enable this I/O subsystem to extend the input/output
capabilities of the processor subsystem. Features such as PCI-X adapters, and internal
SCSI disk drives are supported.
Model D20 Operator Indicators
v LED indicators visible on each PCI adapter light-pipe
v LEDs for power on, attention, SCSI activity
v Attention/Identify LEDs
v Rack Beacon
Model D20 PCI-X Slots
Seven PCI-X slots are available. The slots are 64-bit capable at up to 133 Mhz, 3.3
volts. The slots are numbered on the rear of the chassis from left to right 1 through 7.
The I/O backplane and each I/O slot have green power indicator LEDs and amber
identify LEDs. The following illustration shows the LED locations when viewing from the
16 Eserver pSeries 7311 Model D10 and Model D20 Service Guide
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