System Overview 1-17
PCI modules
The server has two PCI modules that are CRUs, hot pluggable, and fault-tolerant. Each
PCI module contains a PCI board that transfers data from PCI devices to the CPU. The
PCI module is fault-tolerant such that if one stops functioning the other PCI module
takes over.
The PCI modules are numbered 1 and 2, left to right as seen from the front of the
system. Each PCI module has two status indicators that are listed along with a
description of each in Table 1-4. Table 1-10 summarizes the features of a PCI module.
Table 1-10. Features of the PCI module
Feature Description
PCI slots Four PCI expansion card slots are available in the PCI module.
Note that Slot 1 is reserved for a graphics video card or the SMM card.
Embedded
adapters
Two embedded adapters are available as follows:
– LAN
– SCSI disk
Network port One Ethernet port for connecting to a network from the embedded LAN
adapter.
PCI Adapter Cards
For fault-tolerant systems the 32 bit PCI adapter cards must be installed in the PCI
modules as redundant pairs. This is so that if a PCI card fails in one PCI module its
equivalent PCI card in the other PCI module takes over the I/O operation without the
processing being interrupted or having any loss of data or performance.
Located on the bottom front of each PCI module are PCI adapter-slot status LEDs that
monitor the status of each PCI card. See Table 1-5 for a list and description of these PCI
adapter-slot status LEDs.
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