18
Risks associated with extreme density
While it is possible to build a fully populated a rack with server blades and retain power supply and
line cord redundancy using HP BladeSystem p-Class 1U power enclosures, several items should be
considered prior to implementation.
The primary issues associated with extreme density that must be seriously considered include: heat,
weight, PDU placement and PDU breaker and line cord access after the rack is built. Before
deploying these configurations, consider the heat load placed on the data center air-conditioning
system and the weight load placed on the floor.
There are two methods of properly implementing a rack with six 1U power enclosures installed.
1. Install six 40 A modular PDUs in the rack. This PDU setup provides power for up to six 1U power
enclosures, with a maximum of four power supplies in each enclosure. It provides sufficient power
for all ProLiant BL20/25p configurations, ProLiant BL40/45p configurations, and the majority of
ProLiant BL35p configurations. The ProLiant BL30p configuration requires six power supplies per
power enclosure. Some of the dual-core ProLiant BL35p configurations may require six power
supplies, which can risk overloading the PDUs.
2. Use the HP S348 Monitored PDU or S332 Monitored PDU.
NOTE: International configurations can be assembled using the 32 A
modular PDU. This PDU has slightly less power capacity (7,680 VA versus
the 8,320 VA) than the 40 A modular PDU. Always check the power
calculators.
Supported configurations for the S348 Monitored PDU and S332
Monitored PDU
The S348 and S332 PDUs mount in the rear of the rack so there are no issues with access to breakers
or line cords. However, access can be enhanced using a rear extension kit, which adds an extra 155
mm or 6 inches of depth to the rear of the rack. The addition of the rack light kit can also significantly
increase ease of use and access.
North America/Japan
Install four HP 17.3 kVA S348 Monitored PDUs. This provides 24 -four C19 outlets and 34.6 kVA of
power and supports up to six 1U power enclosures of 5.7 kVA each. For 1U power enclosures of 2.8
kVA or less, two S348 Monitored PDUs are sufficient.
International
Install four S332 Monitored PDUs. This provides 42 kVA of power and can support six 1U power
enclosures of any configuration. For 1U power enclosures of 3.52 kVA or less, two S332 Monitored
PDUs are sufficient.
Supported configurations for the 40 A PDU
The 40 A PDUs can be mounted in a 1U configuration, which is recommended for best access, or in
the "0U" space in the side of the rack, which may provide restricted access to the PDU breakers.
The following configurations are potential solutions to provide power for six server blade enclosures
powered by six 1U power enclosures and a 40 A PDU.
(12 pages)
(28 pages)
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