HP Integrity rx8640, HP 9000 rp8440 Server User Service Guide

Table 3 Removable Media Drive Path

PathRemovable Media

0/0/0/2/1.x

.0Slot 0 media

1/0/0/2/1.x

.0Slot 1 media

X equals 2 for a DVD drive while X equals 3 for a DDS-4 DAT drive.

Table 4 Hard Disk Drive Path

PathHard Drive

0/0/0/2/0.6.0Slot 0 drive

0/0/0/3/0.6.0Slot 1 drive

1/0/0/2/0.6.0Slot 2 drive

1/0/0/3/0.6.0Slot 3 drive

System Backplane

The system backplane board contains the following components:

• Two crossbar chips (XBC)

• Clock generation logic

• Preset generation logic

• Power regulators

• Two local bus adapter (LBA) chips that create internal PCI buses for communicating with the

core I/O card.

The backplane also contains connectors for attaching the cell boards, PCI-X backplane, MP core

I/O cards SCSI cables, bulk power, chassis fans, front panel display, intrusion switches, and

external system bus adapters (SBA) link connectors.

The two LBA PCI bus controllers on the system backplane create the PCI bus for the core I/O cards.

You must shut down the partition for the core I/O card before removing the card.

Having the SCSI connectors on the system backplane allows replacement of the core I/O card

without having to remove cables in the process.

System Backplane to Cell Board Connectivity

The system backplane provides four sets of connectors, one set for each cell board.

The system backplane routes the signals from the cell boards to the communication crossbars. Cell

boards 0 and 1 are directly connected to the I/O backplane found in the server. Cell boards 2

and 3 can be connected to a separate I/O expansion chassis connected to the system backplane.

System Backplane to Core I/O Card Connectivity

The core I/O cards connect at the rear of the system backplane through two connectors. SCSI and

LAN on a core I/O are accessed via a PCI-X 66 MHz bus. Two LBA bus controllers located on the

system backplane allow communication to the I/O devices. The LBAs are connected to the SBA

on the PCI-X backplane by single ropes.

The system backplane routes the signals to the various components in the system. The core I/O

signals include the SCSI bus for the system hard drives and the bus for the removable media

devices. Each core I/O card provides SCSI buses for the mass storage devices.

The management processor for the chassis resides on the core I/O card, so the system backplane

also provides interfaces required for management of the system. These interfaces and the

manageability circuitry run on standby power.

Detailed Server Description 19