HP BL c-Class SB40c PCI Express Mezzanine Pass Thru Option Kit : User Service Guide, Fourth Edition

Chapter 1

Introduction

Detailed Server Expansion Unit Description

12

MP Core I/O Board

The Server Expansion Unit core I/O card is the same one used in the server chassis. Up to two core I/O cards

plugged into the Server Expansion Unit. Two core I/O cards allows for two additional I/O partitions to be

added to the number of partitions that exist in the server attached to the Server Expansion Unit. Since the

server can have up to two partitions, the total number of partitions possible in a server with the Server

Expansion Unit attached is four partitions.

The core I/O card is can be replaced with standby power applied. The system power to the core I/O is handled

in the hardware the same way a hot-plug PCI/PCI-X card is handled. Standby power to core I/O is handled by

power manager devices to limit inrush current during insertion.

Mass Storage (Disk) Backplane

Internal mass storage connections to disks are routed on the mass storage backplane, having connectors and

termination logic. All hard disks are hot-plug while removable media drives are not hot-plug. The Server

Expansion Unit accommodates two internal, removable media devices. Therefore, power connectors for a

removable media drive are required on the mass storage backplane. The Server Expansion Unit chassis will

have to be powered off to remove or replace removable media drives.

Table 1-6 PCI-X Slot Types

I/O

Partition

Device

2 PCI (33 or 66 MHz) / PCI-X (66 or 133 MHz) 64-bit, 3.3V connector, Hot Plug Slot.

3 PCI (33 or 66 MHz) / PCI-X (66 or 133 MHz) 64-bit, 3.3V connector, Hot Plug Slot.