Site requirements 43
Acoustics
The acoustic emission specification for the disk array is:
• 65 dB (A) sound pressure, operator position (1 meter from the floor
and surface of the cabinet)
You can reduce the ambient noise level caused by equipment and air
conditioning blowers in your computer room by:
• Installing a dropped ceiling covered in commercial-grade, fire-
resistant, acoustic-rated, fiberglass ceiling tile
• Covering the walls in sound-deadening material
• Installing foam rubber removable partitions
Dust and pollution control
Airborne contaminants and particles of a certain size and hardness can
damage the disk array. Some of the most common contaminants are dust,
smoke, ash, eraser debris, food crumbs, and salty air.
Mechanical filters on the disk array protect it by trapping large dust
particles. Smaller particles can pass through some filters, and can
eventually cause problems in mechanical parts. Prevent small dust particles
from entering the computer room by maintaining its air conditioning
system at a high static air pressure level.
Your HP representative can help you determine if you need to be concerned
about airborne contaminants.
Metallic particulate contamination
Metallic particulates can be especially harmful around electronic
equipment. This type of contamination may enter the data center
environment from a variety of sources, including but not limited to raised
floor tiles, worn air conditioning parts, heating ducts, rotor brushes in
vacuum cleaners, or printer component wear. Because metallic particulates
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