Figure 19. Drive Location
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; 222 mm).
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 ESMs and five cooling modules.
Drawers
Note:
An operation related to open a drawer needs to be finished in 5 minutes.
Each drawer contains 42 bays, 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 hot-swapped while the
enclosure continues to operate. However, drawers must not be left open for longer than two 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.
Safety features:
• 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 by three baseplanes and two sideplanes. The sideplanes ensure redundant power
and signal paths to each drive.
Each drawer can be locked shut by turning both anti-tamper locks clockwise using a screwdriver with a Torx
T20 bit (see Figure 18 “Module Locations” on page 15). Each side of each drawer has a series of status
LEDs, shown in the following figure..
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