IBM 88861TU, Planning Manual

Page: 13 / 130

Note: Four power modules are required in the BladeCenter S chassis if both
storage modules are installed.
To access the hard disk drives in the storage module, the following devices must
be installed:
v
SAS I/O modules. You can choose to install either SAS connectivity modules or
SAS RAID controller modules.
Note: You cannot mix these module types in the same BladeCenter S chassis.
– SAS connectivity module. At least one SAS connectivity module must be
installed. If a single SAS connectivity module is installed, it controls access to
both storage modules in the BladeCenter S chassis. If two SAS connectivity
modules are installed, the module in I/O module bay 3 controls access to
storage module 1, and the module in I/O module bay 4 controls access to
storage module 2.
– SAS RAID controller module. Two SAS RAID controller modules must be
installed, one in I/O module bay 3 and the other in I/O module bay 4. Each
SAS RAID controller module will have access to both storage modules (for
high availability).
v
A SAS expansion card in each of the blade servers, which provides access
through the SAS I/O modules in I/O module bays 3 and 4 to the SAS or SATA
hard disk drives in each storage module.
There is one LED on each storage module:
Fault Solid (amber) when there is a storage module failure.
Chapter 1. Introduction
7