Additional Uses For Power Capping; Power Capping For Emergency Management - Compaq BL10e - HP ProLiant - 512 MB RAM Introduction Manual

Figure 12. Provisioning with Enclosure Dynamic Power Capping
Using Dynamic Power Capping and Enclosure Dynamic Power Capping to manage data center
power provisioning is examined in greater detail in the ―
http://h71028.www7.hp.com/ERC/downloads/4AA2-3107ENW.pdf
white paper available at

Additional uses for power capping

Both basic Power Capping and Dynamic Power Capping can be used in other capacities in the data
center, including emergency management and automatic power control during peak demand periods

Power capping for emergency management

Power capping can be used to effectively manage server power consumption when unforeseen
circumstances arise. A common example would be a cooling system failure in part of a data center.
In this situation, administrators can manually lower the power cap on a group of servers using IPM
and power capping. This will quickly and efficiently lower server power consumption and heat
generation in the affected area until cooling can be restored. Under these circumstances, it may be
appropriate to set power caps significantly lower, even though they may impact performance. Using
SIM, an administrator can define and store groups of servers as collections. This allows the
administrator to quickly apply power caps to these groups in an emergency.
Power capping can also be used effectively if all or part of a data center loses primary AC power. An
administrator can immediately apply a group power cap to lower power consumption for server
groups, decreasing the power drain on data center Uninterruptible Power Supplies (UPSs). This
increases the maximum window of time, commonly referred to as ride-through time, the data center
can remain operational after a power failure but before power and cooling is restored by the on-site
generators.
Power Provisioning with
Enclosure Dynamic Power Capping
7836 Watts
(PSU Specification)
4000 Watts
(Measured Peak)
0 Watts
P ower P rovisioned to P S U
2612 x 3 = 7836 watts
•
S ingle 3Ø L ine = 8640
•
16 B lades per 8KW
•
Power Provisioned to Cap at
Measured Peak
• ≈4KW enclosure
• 32 Blades per 8KW
Dynamic Power Capping TCO and Best Practices‖
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