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5: Rack Information
Altix 42U and 20U Rack Features
The Altix racks (shown in Figure 5-1 and Figure 5-2) have the following features and
components:
• Front and rear door. The front door is opened by grasping the wide end of the
triangle-shaped door piece and pulling outward. Note that the tall rack uses a key lock for
security purposes; the short (20U) rack does not.
The rear door of the tall (42U) rack has a push-button key lock to prevent unauthorized
access to the system. The tall rack’s front door and rear door locks are keyed differently.
You cannot use the rear door key to secure the front door lock.
• Cable entry/exit area. Cable access openings are located in the front floor and top of the
rack. Cables are only attached to the front of the IRUs; therefore, cable management occurs
primarily in the front of the rack. In the case of storage modules, cables are attached to the
front connectors on the IRU and routed to the rear of the storage enclosure. I/O and power
cables normally pass through the bottom of the rack.
• Rack structural features. Each rack is mounted on four casters; the two rear casters swivel.
There are four leveling pads available at the base of the tall rack. The base of both racks have
attachment points to support an optional ground strap, and/or seismic tie-downs.
• Power distribution units within the racks. Up to four single-phase power distribution
units (PDUs) are needed in a tall rack, depending on the number of IRUs and other optional
modules installed. The 42U rack systems are also available with one (18-socket) three-phase
PDU. Short racks use a maximum of two single-phase PDUs. Each IRU requires two outlets
from the 5-outlet single-phase PDUs.