HP ProLiant SL270s HP ProLiant SL Servers Planning Guide - Page 24

Power considerations, Power options, Power redundancy

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• Auto-start generators-provide backup power to the UPS. • Missing-phase and low-voltage detectors-initiate a transfer of the UPS to generator power when a severe power interruption occurs. For peripheral equipment, these devices are recommended but optional. For each situation, refer to qualified contractors or consultants. Power considerations Power is best managed within the rack by the use of one or more rack-mounted PDUs. Depending on the configuration, you might have to use multiple PDUs to connect all devices inside the rack. The total power load for a PDU must not exceed 80% of the branch circuit rating. If you do not use a PDU, connect each piece of equipment within the rack to a dedicated branch circuit. For additional information, see the HP website (http://www.hp.com/go/hppoweradvisor). Power options The following table describes the available power option and provides details about this option. Chassis part Source type Source voltage Plug or Circuit type number (nominal) connector type Power receptacle required 614169-003 Single- phase 100V to 120V AC 200V to 240V AC 50Hz/60Hz IEC 320 16A Single-phase IEC320-C19* C19-C20 1.2-m 100V to 120V or (4-ft) jumper cord 200V to 240V *Additional power cords are available for single-phase solutions. For more information, see the HP website (http://www.hp.com/go/hppoweradvisor). All branch circuits used within a facility must be connected together to form a common ground. All power sources such as transformers, UPS devices, and other sources, must be connected together to form a common ground. Power redundancy High-availability information technology equipment such as servers and storage devices can be configured with backup or redundant power sources and power supplies in either of the following configurations: • N+N design: N power supplies can be provided where N/2 power supplies are capable of sustaining the associated equipment's power demand. For the HP ProLiant s6500 Chassis this quantity is typically a 2+2 power supply configuration. • N+1 design: Typically four power supplies are provided, requiring at least three to handle the equipment's power demand. If one fails, the other three remain on line with enough capacity to meet the power demand. Be sure that the wiring and branch circuitry to each installation is suitably rated for the power demand of the connected equipment. To provide additional redundancy, HP recommends routing the power through separate branch circuits, breaker panels, and PDUs. Power requirements and considerations 24

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Power requirements and considerations
24
•
Auto-start generators–provide backup power to the UPS.
•
Missing-phase and low-voltage detectors—initiate a transfer of the UPS to generator power when a
severe power interruption occurs. For peripheral equipment, these devices are recommended but
optional.
For each situation, refer to qualified contractors or consultants.
Power considerations
Power is best managed within the rack by the use of one or more rack-mounted PDUs. Depending on the
configuration, you might have to use multiple PDUs to connect all devices inside the rack.
The total power load for a PDU must not exceed 80% of the branch circuit rating. If you do not use a PDU,
connect each piece of equipment within the rack to a dedicated branch circuit.
For additional information, see the HP website (
).
Power options
The following table describes the available power option and provides details about this option.
Chassis part
number
Source type Source voltage
(nominal)
Plug or
connector type
Circuit type
Power receptacle
required
614169-003
Single- phase 100V to 120V
AC
200V to 240V
AC
50Hz/60Hz
IEC 320
C19-C20 1.2-m
(4-ft) jumper cord
16A Single-phase
100V to 120V or
200V to 240V
IEC320-C19*
*Additional power cords are available for single-phase solutions. For more information, see the HP website
(
).
All branch circuits used within a facility must be connected together to form a common ground. All power
sources such as transformers, UPS devices, and other sources, must be connected together to form a common
ground.
Power redundancy
High-availability information technology equipment such as servers and storage devices can be configured
with backup or redundant power sources and power supplies in either of the following configurations:
•
N+N design: N power supplies can be provided where N/2 power supplies are capable of sustaining
the associated equipment's power demand. For the HP ProLiant s6500 Chassis this quantity is typically
a 2+2 power supply configuration.
•
N+1 design: Typically four power supplies are provided, requiring at least three to handle the
equipment's power demand. If one fails, the other three remain on line with enough capacity to meet the
power demand.
Be sure that the wiring and branch circuitry to each installation is suitably rated for the power demand of the
connected equipment. To provide additional redundancy, HP recommends routing the power through
separate branch circuits, breaker panels, and PDUs.