Installation Guide, Third Edition - Server Expansion Unit

Chapter 1
Introduction
Server Expansion Unit Overview
5
Core I/O Boot Paths
The Server Expansion Unit internal I/O devices are located on the core I/O. The following table outlines the
paths assigned to the hard disk and removable media disk bays located on the front of the Server Expansion
Unit cabinet. Core I/O card 2 refers to the core I/O located in the bottom slot at the rear of the system. Core
I/O card 3 refers to the core I/O card located in the top slot at the rear of the system. Core I/O cards 0 and 1
are located in the server.
PCI-X Backplane
The PCI-X board provides sixteen 64-bit, hot-swappable PCI-X slots. The application specific integrated
circuit (ASIC) on each cell board in the server chassis has SBA link connections to communicate with one SBA
controller. The ASIC in cell locations zero and one are connected to the SBA ASICs on the PCI board installed
in the main server chassis through the printed circuit board routing. External SBA link cables are used to
connect the ASICs on cell boards residing in locations two and three of the server to the two SBA ASICs on
the PCI-X board in the Server Expansion Unit.
The SBA ASIC converts the SBA link protocol into ropes. Each SBA has 16 ropes that connect to LBA ASICs.
The LBA ASICs convert ropes protocol into PCI/PCI-X bus protocol. Each PCI/PCI-X slot is connected to its
own dedicated LBA. Of the 16 LBAs (one for each of the 16 slots), 14 LBAs have dual ropes connected from an
SBA. The remaining two LBAs have a single rope connected from the SBA. Each of the 16 PCI/PCI-X slots is
capable of 66MHZ/33MHZ PCI or 133MHZ/66MHZ PCI-X. All 16 PCI/PCI-X slots on the PCI-X backplane are
Table 1-1 Server Expansion Unit Core I/O Boot Path
Core I/O
card
Device Path Description
2 Console 2/0/0/0/1 Connected to the MP. User access is through the
MP port.
2 1Gb LAN 2/0/0/1/0 The SYS LAN connector located on core I/O 2.
2 SCSI drive 2/0/0/2/0.6.0 Hard drive located in the top left disk bay.
2 SCSI drive 2/0/0/2/1.X.0 Removable media DVD (X = 2) or DDS-4 (X = 3)
tape drive located in the upper disk bay.
2 SCSI drive 2/0/0/3/0.6.0 Hard drive located in the top right disk bay.
2 SCSI drive 2/0/0/3/1 SCSI drive connected to the external SCSI
Ultra3 connector on the core I/O card.
3 Console 3/0/0/0/1 Connected to the MP. User access is through the
MP port.
3 1Gb LAN 3/0/0/1/0 The SYS LAN connector located on core I/O 3.
3 SCSI drive 3/0/0/2/0.6.0 Hard drive located in the bottom left disk bay.
3 SCSI drive 3/0/0/2/1.X.0 Removable media DVD (X = 2) or DDS-4 (X = 3)
tape drive located in the upper disk bay.
3 SCSI drive 3/0/0/3/0.6.0 Hard drive located in the bottom right disk bay.
3 SCSI drive 3/0/0/3/1 SCSI drive connected to the external SCSI
Ultra3 connector on the core I/O card.