Environmental Requirements - HP StorageWorks XP128 Installation Manual

Environmental requirements

Caution
54
The environmental specifications for operating your disk array must be
satisfied prior to installation.
Air conditioning ducts
Use separate computer room air conditioning duct work. If it is not separate
from the rest of the building, it might be difficult to control cooling and air
pressure levels. Duct work seals are important for maintaining a balanced
air conditioning system and high static air pressure. Adequate cooling
capacity means little if the direction humidity levels increase when the
ducts are exposed to warm air.
Humidity
Maintain proper humidity levels. High humidity levels causes galvanic
actions to occur between some dissimilar metals. This eventually causes a
high resistance between connections, leading to equipment failure.
Low humidity contributes to undesirably high levels of electrostatic
charges. This increases the electrostatic discharge (ESD) voltage potential.
ESD can cause component damage during servicing operations.
Static charges (voltage levels) occur when objects are separated or rubbed
together. The voltage level of a static charge is determined by the following
factors:
• Types of materials
• Relative humidity
• Rate of change or separation
HP StorageWorks Disk Array XP128: Site Preparation Guide