IBM System Storage DCS9900 1269-3S2 Storage Expansion Unit Installation, Service, and User Guide
2
1.2 Enclosure Core Product
The IBM System Storage DCS9900 3S2 Storage Expansion Unit design concept is based on a
subsystem together with a set of plug-in modules. The IBM System Storage DCS9900 3S2 Storage
Expansion Unit as supplied comprise:
• Up to 16
Drive Carrier Modules
(
)
•
Chassis
and
Backplane
with integral
Operators Panel
.(
)
•
Dummy Drive Carrier Modules
(as required)
• Two (2) plug-in
Power Supply/Cooling
Modules
, (.AC, 450W (
• Two (2) plug-in
EBOD
(Expanded Bunch of Disks)
Serial Controller (EM) Modules
. (
).
1.2.1 Enclosure Chassis
The chassis consists of a sheet metal enclosure assembly containing a Backplane Printed Circuit Board
(PCB) and module runner system. This chassis assembly also includes an integral Operators (Ops)
Panel, mounted at the rear.
The chassis assembly contains 16 drive bays at the front, each of which accommodates a plug-in drive
carrier module. The 16 drive bays are arranged in 4 rows of 4 drives. At the rear, the chassis assembly
contains the integral Ops Panel module and four plug-in module bays to house two Power Supply/Cooling
modules and two EBOD modules.
The Backplane PCB provides logic level signal and low voltage power distribution paths.
Figure 1–2
shows typical front and rear views of an IBM System Storage DCS9900 3S2 Storage Expansion Unit
chassis assembly.
The chassis is fitted with 19 inch rack mounting features which enables it to be fitted to standard 19 inch
racks and uses 3 EIA units of rack space.
Note
A drive bay is defined as the space required to house a single 1.0" high 3.5 inch disk drive in its carrier
module. For example, a 1 x 4 bay module would take the space of 1 drive width by 4 drive bays high (in
rack mount configuration). A 4 x 4 bay module is shown in
.
Figure 1–2
Enclosure Chassis (Front and Rear Views)
