HP BL460c HP BladeSystem c7000 Enclosure technologies,4th edition - Page 30

NOTE In redundant environments, at least two power supplies are always active, and the maximum load that can be reached on any power supply is 50%. Once the 50% load is reached, another two power supplies are activated to ensure that redundancy is maintained at all times. Power Regulator HP ProLiant Power Regulator provides iLO-controlled speed stepping for Intel x86 and recent AMD processors. The Power Regulator feature improves server energy efficiency by giving processors full power when they need it and reducing power when they do not. This power management feature allows ProLiant servers with policy-based power management to control processor power states. Power Regulator can be configured for continuous, static low power mode or for Dynamic Power Savings mode in which power is automatically adjusted to match processor demand. Additional information on the HP Power Regulator is provided in the paper titled ―Power Regulator for ProLiant servers‖: http://h20000.www2.hp.com/bc/docs/support/SupportManual/c00593374/c00593374.pdf. Basic Power Capping for each server blade Using ProLiant Onboard Administrator (iLO 2) firmware version 1.30 and System ROM/BIOS dated May 1, 2007, or later, ProLiant server blades can limit the amount of power consumed. Customers can set a limit in watts or BTUs per hour. The purpose of this limit is to constrain the amount of power consumed, which reduces heat output into the data center. The ProLiant Onboard Administrator (iLO 2) firmware monitors server power consumption, checks it against the power cap goal, and, if necessary, adjusts server performance to maintain an average power consumption that is less than or equal to the power cap goal. This functionality is available on all ProLiant server blades using Intel or recent AMD processors. Using the Insight Power Manager (IPM) v1.10 plug-in to HP Systems Insight Manager v5.1, customers can set power caps on groups of supported servers. The IPM software statically allocates the group power cap among the servers in the group. The group cap is allocated equitably among all servers in the group based on a calculation using the idle and maximum measured power consumption of each server. In addition, IPM can track and graph over time the actual power use of groups of servers and enclosures. This provides data center facilities managers with measured power consumption for various time periods, reducing the need to install monitored PDUs to measure actual power use in data centers. HP Dynamic Power Capping HP launched Dynamic Power Capping in December 2008 with ProLiant Onboard Administrator (iLO 2) version 1.70. Supported servers contain an internal hardware circuit that monitors server power consumption on a sub-second basis. If consumption approaches the power cap set in ProLiant Onboard Administrator (iLO 2), the internal hardware circuit will limit power consumption quickly enough to protect PDU-level circuits from over-subscription and prevent power-related server outages. At the enclosure level, HP Enclosure Dynamic Power Capping lets administrators set an enclosure level power cap. The BladeSystem Onboard Administrator manages the power distribution to the server blades and will change server caps over time as workloads change. Enclosure Dynamic Power Capping requires redundant power wired to separate A and B feeds, redundant BladeSystem Onboard Administrator modules using firmware version 2.30 or later, and supported servers using ProLiant Onboard Administrator (iLO 2) version 1.70 or later. 30