Power Capping For Emergency Management - HP Integrity NonStop NB54000c Introduction Manual

Figure 12. Provisioning with Enclosure Dynamic Power Capping
Note that the group control algorithms used for Enclosure Dynamic Power Capping compensate for variables such
as hot-add disk drives and changing fan power, so no additional guardband is required.
The white paper "Dynamic Power Capping TCO and Best Practices"
Capping and Enclosure Dynamic Power Capping to manage data center power provisioning.
Additional uses for power capping
You can use both basic Power Capping and Dynamic Power Capping in other ways in the data center, including
emergency management and automatic power control during peak demand periods.

Power capping for emergency management

You can use power capping to manage server power consumption effectively when unforeseen circumstances arise.
For example, if a cooling system fails in part of a data center, you can manually lower the power cap on a group of
servers using Insight Control and power capping. This will quickly lower server power consumption and heat
generation in the affected area until you can restore cooling. Under these circumstances, it may be appropriate to
set power caps significantly lower, even though they may affect performance. Using HP SIM, you can define and
store groups of servers as collections. This allows you to apply power caps to these groups quickly in an
emergency.
Similarly, if all or part of a data center loses primary AC power, you can immediately apply a group power cap to
lower power consumption for server groups. This reduces the power drain on data center Uninterruptible Power
Supplies (UPSs), which increases the maximum window of time that the data center can remain operational after a
power failure but before the on-site generators restore power and cooling.
Power Provisioning with
Enclosure Dynamic Power Capping
7836 Watts
(PSU Specification)
4000 Watts
(Measured Peak)
0 Watts
P ower P rovis ioned 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
provides more detail on using Dynamic Power
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