Site Preparation Guide, Third Edition - Server Expansion Unit

Appendix A
General Site Preparation Guidelines
Space Requirements
28
Space Requirements
This section contains information about space requirements for the server. This data should be used as the
basic guideline for space plan developments. Other factors such as airflow, lighting, and equipment space
requirements must also be considered.
Delivery Space Requirements
There should be enough clearance to move equipment safely from the receiving area to the computer room.
Permanent obstructions such as pillars or narrow doorways can cause equipment damage.
Delivery plans should include the possible removal of walls or doors.
Operational Space Requirements
Other factors must be considered in addition to the basic equipment dimensions. Reduced airflow around
equipment causes overheating, which can lead to equipment failure. Therefore, the location and orientation of
air-conditioning ducts, as well as airflow direction, are important. Obstructions to equipment intake or
exhaust airflow must be eliminated.
The locations of lighting fixtures and utility outlets affect servicing operations. Plan equipment layout to take
advantage of lighting and utility outlets. Do not forget to include clearance for opening and closing equipment
doors.
Clearance around the cabinets must be provided for proper cooling airflow through the equipment.
If other equipment is located so that it exhausts heated air near the cooling air intakes of the server cabinets,
larger space requirements are needed to keep ambient air intake to the server cabinets within the specified
temperature and humidity ranges. See Table A-4 for operating ranges.
Space planning should also include the possible addition of equipment or other changes in space
requirements. Equipment layout plans should also include provisions for the following:
• Channels or fixtures used for routing data cables and power cables
Table A-4 Computer Room Environment
Parameter Operating Limits
Recommended
Operating
Range
Maximum Rate of
Change (per hour)
Non-Operating
Ranges
Temperature
a
a. The temperature ranges stated are at 0 to 5,000 feet. The maximum operating temperature must be
de-rated by 1° C/1,000 feet from 5,000 to 10,000 feet.
41°–95° F
(5°–35° C)
68°–77° F
(20°–25° C)
9° F repetitive,
36° F non-repetitive
(5° C repetitive,
20° C non-repetitive)
-40° C to +70° C
Humidity 15–80%
with no condensation
(40–55% recommended)
40–55% RH
non-condensing
6% 90% RH
non-condensing
at 65° C (149° F)