Enclosure Chassis; Drawers - IBM 084 Installation And User Manual

Figure 7. Module locations

Enclosure Chassis

The chassis consists of a sheet metal enclosure assembly with an integrated midplane PCB, module
runner system, and two drawers for drive modules.
The chassis has a 19 inch rack mounting that enables it to be installed on to standard 19 inch racks and
uses 5 EIA units of rack space (8.75 inches; 222mm).
Each drawer contains 42 bays for Disk Drives in Carriers (DDICs). DDICs are top-mounted into the

drawers.

At the rear, the chassis assembly can accept two PSUs, two SBB I/O modules and five cooling modules.
Drawers
Each drawer contains 42 slots, each of which accepts a single DDIC containing a 3.5" drive or a 2.5" drive
with an adapter..
Opening a drawer does not interrupt the functioning of the system, and DDICs can be hotswapped while
the enclosure continues to operate. However, drawers must not be left open for longer than 10 minutes,
otherwise airflow and cooling will be compromised.
The drawer is designed to support its own weight, plus the weight of any drives, when fully open.
The following safety features are included:
• To reduce the possibility of toppling, only one drawer can be open at any one time.
• The drawer locks into place when opened all the way. To reduce pinching hazards, two latches must be
released before the drawer can be pushed back in.
Power and data are sent via three baseplanes and two sideplanes.
Each drawer can be locked shut by turning both anti-tamper locks clockwise using a screwdriver with a
Torx T20 bit (see Figure 7 on page 11). Each side of each drawer has a series of status LEDs, shown in the
following figure.
Chapter 2. System overview 11