HP DL360 Power basics for IT professionals - Page 41

Sag: See Dropout., multiplied by amperes, divided by time. See Power factor correction.

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Power distribution panel: See Distribution panel. Power distribution unit (PDU): A rack-mounted component that connects directly to the AC power infrastructure of a building. The PDU typically provides circuit-breaker protection for groups of AC outlets into which separate AC components of a rack are plugged. Some PDU designs offer primary/secondary switching. In some instances PDU can refer to a transformer for the entire floor of a data center. Power enclosure: A discrete chassis that encloses one or more server blade power supplies and uses low-voltage DC power. Power factor: Apparent power (expressed in volt-amperes) divided into real power (expressed in watts) is a measure of power efficiency. A power factor of or near 1.0 denotes a highly efficient power supply or uninterruptible power supply. Ideally, the power factor should be between 0.9 and 1.0; however, a power factor above 0.8 should be sufficient. Power factor correction (PFC): Placing a capacitor in parallel to an inefficient circuit to improve the power factor. Power outlet: A power socket. See: Power socket. Power plug: A connector that fits into an electrical socket. A power plug has male features that include a live contact, a neutral contact, and an optional ground. In many plugs, the live and neutral contacts look the same; and in some plugs, both contacts may be live. Most three-phase power plugs have four or five contacts including a ground. Power service: Point at where electrical power enters a building or equipment room. Power socket (outlet, plug-in, receptacle): A connection point that accepts a power plug (which has male features) through matching female features. Power supply: An electrical device that supplies a constant current flow to one or more computers or servers. See Pooled power. Prong: A power plug contact. Rated voltage: The maximum voltage at which an electric component can operate for extended periods without undue degradation or safety hazard. Real power: A function of voltage, current, and resistance, real power is measured as voltage multiplied by amperes, divided by time. See Power factor correction. Receptacle: A power socket. Also female connector that generally attaches to the equipment. The physical design and/or layout of the receptacle's contacts will meet a specific standard. Rectifier: A diode circuit that converts alternating current (AC) to non-alternating current. Redundancy: Having more than the required number of a device, such as a power supply. When a server is configured for 1+1 redundancy, one power supply powers the server while a second power supply stands ready to provide power if the power supply in service should fail. When a server is configured for N+1 redundancy, N power supplies are powering the server while one additional power supply stands in reserve. Resistivity: A measure of how strongly a material opposes the flow of electricity. Resistance: A conductor's resistance to current, measured in ohms. See Conductivity. Sag: See Dropout. Server blade: A highly compact and modular server offering 3 to 10 times the density of conventional servers, with substantial and attendant benefits in integration and management costs. HP BladeSystem c-Class server blades are an example of server blades. 41

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Power distribution panel: See Distribution panel.
Power distribution unit (PDU): A rack-mounted component that connects directly to the AC power
infrastructure of a building. The PDU typically provides circuit-breaker protection for groups of AC
outlets into which separate AC components of a rack are plugged. Some PDU designs offer
primary/secondary switching. In some instances PDU can refer to a transformer for the entire floor of
a data center.
Power enclosure: A discrete chassis that encloses one or more server blade power supplies and uses
low-voltage DC power.
Power factor: Apparent power (expressed in volt-amperes) divided into real power (expressed in
watts) is a measure of power efficiency. A power factor of or near 1.0 denotes a highly efficient
power supply or uninterruptible power supply. Ideally, the power factor should be between 0.9 and
1.0; however, a power factor above 0.8 should be sufficient.
Power factor correction (PFC): Placing a capacitor in parallel to an inefficient circuit to improve the
power factor.
Power outlet: A power socket. See: Power socket.
Power plug: A connector that fits into an electrical socket. A power plug has male features that
include a live contact, a neutral contact, and an optional ground. In many plugs, the live and neutral
contacts look the same; and in some plugs, both contacts may be live. Most three-phase power plugs
have four or five contacts including a ground.
Power service: Point at where electrical power enters a building or equipment room.
Power socket (outlet, plug-in, receptacle): A connection point that accepts a power plug (which has
male features) through matching female features.
Power supply: An electrical device that supplies a constant current flow to one or more computers or
servers. See Pooled power.
Prong: A power plug contact.
Rated voltage: The maximum voltage at which an electric component can operate for extended
periods without undue degradation or safety hazard.
Real power: A function of voltage, current, and resistance, real power is measured as voltage
multiplied by amperes, divided by time. See Power factor correction.
Receptacle: A power socket. Also female connector that generally attaches to the equipment. The
physical design and/or layout of the receptacle’s contacts will meet a specific standard.
Rectifier: A diode circuit that converts alternating current (AC) to non-alternating current.
Redundancy: Having more than the required number of a device, such as a power supply. When a
server is configured for 1+1 redundancy, one power supply powers the server while a second power
supply stands ready to provide power if the power supply in service should fail. When a server is
configured for N+1 redundancy, N power supplies are powering the server while one additional
power supply stands in reserve.
Resistivity:
A measure of how strongly a material opposes the flow of electricity.
Resistance: A conductor’s resistance to current, measured in ohms. See Conductivity.
Sag: See Dropout.
Server blade: A highly compact and modular server offering 3 to 10 times the density of conventional
servers, with substantial and attendant benefits in integration and management costs.
HP
BladeSystem c-Class server blades are an example of server blades.
41