Rack Requirements; Cable Management - Cisco UCS 5108 Installation Manual

Rack Requirements

Warning
Only trained and qualified personnel must be allowed to install, replace, or service this equipment.
Statement 1030
Rack Requirements
This section provides the requirements for installing in a standard open rack, assuming an external ambient
air temperature range of 50 to 95°F (10 to 35°C):
Note
Do not use racks that have obstructions. These obstructions could impair access to field-replaceable units
(FRUs).
The Cisco R Series Racks are an ideal choice. If other racks will be used, the rack must be of the following
type:
• Standard 19-inch (48.3 cm) four-post EIA rack, a minimum of 39.4 inches (100 cm) deep, with mounting
• The mounting holes of the rails in the rack must be square (unless the optional round hole adapter kit is
• The tool-less rack-mount kit shipped with the chassis is required. The adjustable rack rails shipped with
• Front and rear doors—If your server rack includes closing front and rear doors, the doors must have 65
The rack must also meet the following requirements:
• The minimum available vertical rack space per chassis must be six RU (rack units), equal to 10.5 inches

Cable Management

To help with cable management, allow additional space in the rack above and below the chassis to make it
easier to route copper cables (plus up to eight copper cables per Cisco UCS 5108 server chassis) through the
rack.
Cable management can be an important factor in preventing overheating issues. In the following figure, the
"before" illustration shows cables blocking the rear of the chassis, and preventing the fans from exhausting
warm air from the chassis. This situation causes failed DIMMs in the blade servers, and seemingly random
server shutdowns when internal temperatures exceed specification. Use cable ties and other wiring practices
to keep the rear of the chassis unobstructed as shown in the "after" illustration.
Cisco UCS 5108 Server Chassis Installation Guide
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rails that conform to English universal hole spacing per section 1 of ANSI/EIA-310-D-1992.
used).
each enclosure extend from 29 inches (73.66 cm) to 35 inches (88.9 cm)
percent open perforated area evenly distributed from top to bottom to permit adequate airflow.
Caution
Always use blanking panels to fill all remaining empty front panel U-spaces in
the rack. This arrangement ensures proper airflow. Using a rack without blanking
panels results in improper cooling that can lead to thermal damage.
(26.7 cm).
Installation