Installation Guide, Second Edition - HP Integrity BL60p Server Blade

Introduction
SCSI Backplane
Chapter 1
22
SCSI Backplane
The server blade SCSI backplane is a dual-disk, single-channel, Ultra320 disk subsystem. It is designed
specifically for the BL60p server blade.
The server blade SCSI backplane provides the following key features:
• Drive configuration: Two low profile disk drives (28.5mm pitch)
• Drive carrier: Common carrier
• SCSI bus configuration: Single bus
• SCSI specification: Ultra320 (backward compatible to Ultra160)
• SCSI drive interface: Low voltage differential (LVD) only
• I2C EEPROM for FRU-ID information
• Hot-swap circuitry
• SCSI bus reset circuitry
• Drive activity LEDs
An LVD SCSI cable connects the SCSI backplane board to the server blade system board. A separate power
cable from the system board provides the power to the disks and other circuitry. The power cable also
contains the I2C bus lines which provide a data path to the EEPROM.
I/O Subsystem (Communications Module)
The I/O solution for the server blade is to use a communications module for the LAN and Fibrechannel to
communicate over the blade enclosure signaling backplane (through the system board). The module design
meets the following objectives:
• Functions correctly and consistently with the BL p-Class LAN and Fibrechannel solutions.
• Module design works with the existing HP-UX drivers for the BCM 5704 and ISP 2312.
The LAN and Fibrechannel portions of the design emulate the HP AB456 combo card logical design to
ensure correctness and consistency from an HP-UX driver context.
• Meets the mechanical and thermal constraints of the server blade design.
As part of the I/O solution for the server blade, the Communications Module provides the following I/O
connections:
• Two dual 10/100/1000 LAN connections (4 links) routed to the system interface connector.
• Dual 2 Gb Fibrechannel connections routed to the system interface connector.