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System Overview 1-23
Table 1-8. Features of the PCI module
Feature Description
PCI slots Three PCI expansion card slots are available in the PCI module.
Note that Slot 1 is reserved for a graphics video card.
Embedded
adapters
Three embedded adapters are available as follows:
– LAN X 2
– SCSI disk
Network port Two Ethernet ports for connecting to a network from the embedded LAN
adapters.
Storage Bays
Each PCI module has a storage area containing three storage bays that support three
hard disk drives (three logical disks). The hard disk drives are CRUs, hot pluggable,
and redundant. The disk slots are physically numbered 1 – 3, bottom to top in the left
PCI module (Group 1) and are physically numbered 4 – 6, bottom to top in the right
PCI module (Group 2) as seen from the front of the tower system. The disk drives SCSI
ID numbers are 0, 1, 2, bottom to top for each group of logical disk drives and the first
mirrored pairs are physical drives 1 and 4 that contain the boot software, as shown
below. See Figure 1-4 for the location of hard disk drives in the PCI modules.
GROUP 1 GROUP 2
SCSI ID 2
Disk #3
SCSI ID 2
Disk #6
SCSI ID 1
Disk #2
SCSI ID 1
Disk #5
SCSI ID 0
Disk #1
SCSI ID 0
Disk #4
For true dual modular redundancy, all the disk drives must be mirrored in the system, as
shown below. All the disk drives must be added in pairs and only similar disks can
mirror each other. Pairs include drives 1 and 4, 2 and 5, and 3 and 6.
Mirrored Drives
PCI Module
Group 1
PCI Module
Group 2
Drives Drives
36
25
14