Chapter 1: Introduction
Chassis Overview
1-3
used for subsystem configuration, troubleshooting and status
monitoring. (Please refer to
Section 1.3.1
)
1.2.2 Rear Panel Overview
The rear section of the GALAXY subsystem is accessed through the rear
panel and is reserved for a single RAID controller module, one (1) optional
BBU, two (2) power supply units (PSUs) and two (2) cooling modules.
The rear panel of the RAID subsystem is shown in
Figure 1-3
. The
descriptions of rear panel components are given below:
Figure 1-3: GALAXY Rear View
The rear panel shown in
Figure 1-3
accommodates the following
components:
•
RAID controller module:
A RAID controller module is installed in
the GALAXY. The controller module contains a RAID controller
board, a module bay for the optional battery module, and a DDR
RAM DIMM module. (See
Section 1.3.3
)
•
BBU:
An optional BBU sustains cache memory during a power
shortage to prevent data loss. (See
Section 1.3.6
)
•
PSUs:
The hot-swappable PSUs provide power to the subsystem.
The subsystem is powered on or off using the power switches on
the PSUs. (See
Section 1.3.7
)
•
Cooling modules:
The redundant cooling modules ventilate the
subsystem. (See
Section 1.3.8
)
•
Dummy plate:
The GALAXY is a single controller subsystem. The
RAID controller module is installed in the upper controller bay. A
dummy plate covers the lower controller bay at the rear of the
subsystem.
