Cisco Systems N20C6508UPG, UCS 5100, UCS 5108 manual Rack Requirements, Cable Management

Installation

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 rails that conform to English universal hole spacing per section 1 of ANSI/EIA-310-D-1992.

•The mounting holes of the rails in the rack must be square (unless the optional round hole adapter kit is used).

•The tool-less rack-mount kit shipped with the chassis is required. The adjustable rack rails shipped with each enclosure extend from 29 inches (73.66 cm) to 35 inches (88.9 cm)

•Front and rear doors—If your server rack includes closing front and rear doors, the doors must have 65 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.

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 (26.7 cm).

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

	Cisco UCS 5108 Server Chassis Installation Guide
2	OL-20035-05