A P P E N D I X  A

4-Post Cabinet Requirements

The server is designed so that you can install it into a 72-inch (184-cm) tall Sun expansion cabinet or other EIA-compliant industry-standard cabinet that meets the requirements listed in the table in this appendix. You need a Sun rack kit for each server that you rackmount.

For more detailed information about rack options and requirements, and site planning for cabinets and racks, see the Site Planning Guide for Entry-Level Servers Version 1.5. This guide is available at:


Note - The system is fully serviceable in a 4-post cabinet when it is extended on its slide assemblies.

TABLE A-1 4-Post Rack Requirements

Cabinet Feature


Load-bearing capacity

The rack must firmly support the weight of as many Sun Fire V490 servers as you are installing into the cabinet (each server weighs up to 97 lb/44 kg), plus the weight of the rackmounting hardware, and the weight of any other installed devices.

Vertical space requirements

Each server requires five rack units (8.75 in/22.22 cm) of vertical space for rack installation. A 72-inch (184-cm) Sun cabinet ships with a power sequencer so that it can hold up to seven servers (with a power sequencer there are 36 rack units of usable space).

Note: If the servers are fully populated, the cabinet and power sequencer will only support six servers. See the Site Planning Guide for Entry- Level Servers Version 1.5 for more information.

Doors and panels

If you are using a Sun expansion cabinet, you can remove the front and back doors and the side panels to increase access to the system. Otherwise, see the instructions provided with the cabinet.

Anti-tip protection

The cabinet must be bolted securely to the floor or equipped with two sturdy and extendable anti-tip legs. You must prevent the cabinet from tilting forward when one or more systems or devices are fully extended out the front of the cabinet.


The system operating airflow is 200 cfm, regardless of ambient air and altitude. This airflow is designed to provide appropriate cooling up to 95o F (35o C) and 10,000 feet (3,048 meters).

For proper ventilation of the server, the front and back doors must comply with the following minimum open area requirements.

  • 60 percent of the area of the front door that is directly in front of the server must be open.
  • 63 percent of the area of the back door that is directly behind the server must be open.
  • Maintain a minimum of 1.5-inch (3.8-cm) clearance between the system and any front or back doors.

If the doors of the cabinet do not meet the open area requirements, remove the door or doors that do not comply.

For more information about cooling and airflow, see the Site Planning Guide for Entry-Level Servers Version 1.5.

Vertical mounting rails

The cabinet must have two pairs of vertical mounting rails (one pair in front, one pair in back) that conform to the EIA (RETMA) standard for mounting hole spacing.

Left-side-to-right-side rail spacing (mounting hole center to mounting hole center) for front and back rails must be 18.3 inches (46.5 cm).

Front-to-back rail spacing must be at least 23 inches (58.42 cm) and not more than 34.5 inches (87.63 cm) from the outside face of the front rail to the outside face of the back rail.

Front and back vertical rail mounting faces must be parallel with each other and with the front plane of the rack.

EMI shielding

Electromagnetic interference (EMI) shielding requirements are met by the system chassis and metal side panels, which remain in place when the unit is rackmounted.

Minimum service access

An area not less than 3 feet (1 meter) deep and 6 feet (2 meters) wide must be available in front of the cabinet, for installation and service access.

Fire containment

The cabinet must meet Underwriters Laboratories, Inc. and TUV Rheinland of N.A. requirements for fire containment.