HP 3PAR Betriebsanweisung PDF herunterladen (Seite 27)

recommendations for outside air in comfort air-conditioning are 10 to 15 percent of the airflow,

the computer room environment is cleaner and operates more efficiently if outside air is kept below

1 percent of the airflow. Cooling/heating and humidification needs are reduced, and a minimum

of contaminated building air is introduced into the installation area.

Air Cleanliness

Air contaminants can cause equipment malfunction and can damage HP 3PAR Storage systems.

It is essential that steps be taken to prevent air contaminants, such as metal particles, solvent vapors,

corrosive gases, soot, airborne fibers, or salt, from entering or being generated within the server

room environment.

A high-efficiency air filter should be employed on each air inlet for outside air to stop dust at the

point of entry to the installation site. Special additional filtering is necessary where the environment

is exposed to salt air, corrosive gases, or unusual dust/dirt conditions. Electronic equipment is

sensitive to air contaminants such as:

• Excessive amounts of soot particles

• Condensate particulates such as carbonates

• Concrete particulates from unsealed concrete

• Metal flakes or filings, such as those produced by sawing, filing, or drilling

• Floor-cleaning solutions with high ammonia content . Deteriorating/decomposing building

materials, including floor tiles, fabrics, sheetrock, insulation, and acoustical tiles

• Pollutants generated by any servicing performed in and around the computer room

• Paper chaff, dust, and toners from printers within the computer room

• Processing chemicals from reproduction equipment such as microfiche processors.

In electronic equipment, contaminants cause connector contact and motor-bearing degradation.

They also cause electrical leakage, shorting paths between integrated circuit leads and between

printed wiring traces on printed circuit boards.

Air supplied to and circulated within the server room and under the floor plenums should ideally

pass through mechanical or electrostatic filters. HVAC ducts and plenums and sub-floor areas,

including cable raceway openings where used, should be kept clean. All unused cables, hardware,

and debris should be removed from the under the floor area to avoid becoming dust/dirt traps or

potential sources of rust.

During major changes in the server room environment, special considerations must be taken into

account whenever any drilling, sawing, welding, brazing, etc., is performed.

Precautions must be taken to prevent material particles (concrete or metal particles, etc.) from

becoming airborne. HP 3PAR Storage systems should be powered down during construction that

requires any drilling, sawing, welding, brazing, etc. In addition, all debris must be removed before

powering up the server(s). Maximum concentrations of corrosive gases and solvent vapors must

also be considered.

Meeting Environmental Conditions 27

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HP 3PAR Betriebsanweisung Seite 27