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Voltage and Frequency Tolerance
Steady state voltage must be maintained within 10 percent of the normal rated voltage, measured
(under load) at the power input terminal of the specified server. The frequency must be maintained
at (50-60 HZ), 1 phase 50/60 +2 percent, -4 percent.
When there is a possibility of brownouts or other marginal voltage conditions, installing a voltage
monitor may be advisable.
Voltage Spikes
The HP 3PAR Storage Systems are tested to comply with the EN 61000-45 standard.
Installing a lightning protection device on the server room power source is recommended when
the following conditions exist:
The primary power is supplied by an overhead power service.
The utility company installs lightning protectors on the primary power source.
The area is subject to electrical storms or an equivalent type of power surge.
Electrostatic Discharge
Storage systems are susceptible to failure due to Electrostatic Discharge (ESD). Electrostatic charges
can accumulate on people and furniture because of direct contact with floor coverings or movement
while in contact with furniture coverings. Discharge of static electricity to a metal surface on server
cabinets can interfere with the system's operation and cause discomfort to anyone who comes in
contact with it.
Some factors that contribute to electrostatic discharge are:
High-resistance floor covering
Carpeting without anti-static properties
Low humidity (less than 20 percent)
The HP P10000 3PAR Storage System is tested to comply with the EN 61000-45 standard.
Branch Circuits
The individual panel branch circuits should be protected by suitable circuit breakers properly rated
according to manufacturer specifications and applicable codes. Each circuit breaker should be
labeled to identify the branch circuit it is controlling. The receptacle should also be labeled. Plan
on a circuit breaker maximum of 30 A per PDU (de-rated to 24 A).
Emergency Power Control
As a safety precaution, you might consider providing emergency power-off controls for disconnecting
the main service wiring that supplies storage systems. Install these controls at a convenient place
for the operators and next to the main exit doors of the room after checking local electrical codes
for further guidelines.
Redundant Power
The HP P10000 3PAR Storage System cabinets support redundant power within the system through
the use of redundant PDUs and redundant power supplies.
The 2M cabinet is equipped with four power distribution units (PDU) in the rear and the PDUs are
vertically mounted along the left panel for a V400, V800, and expansion cabinet configuration.
As shown in
Figure 17 (page
the upper and lower halves of the cabinet.
36
Power Requirements
37), power domains within the storage system are distributed between
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