HP ProLiant SL165s Technology implementation in HP ProLiant G7 servers - Page 8

power value, known as the Calibrated Max Power, to its iLO device. The iLO devices make this asset information available to the ICpm software. Rack and power planning becomes easy once all of this information has been captured. Insight Control software identifies all HP devices connected to individual circuits and determines the minimum power required to power them on. This gives you a precise view of how much capacity is available for other devices. Dynamic Power Capping completes the solution by letting you control your servers' power use for a given power budget. HP Insight Control power management software HP ICpm software lets you define, monitor, and control the power topology of a data center from a central console, either locally or remotely. For fully automatic power topology discovery, use dedicated management networks and a central management console running HP SIM. From the management console, HP SIM lets you discover and identify HP servers and enclosures, collect inventory data, and collect health/status of the devices. HP SIM also supports the IPMI specification. It works with topologies containing non-HP components and a mix of operating systems. HP Dynamic Power Capping Dynamic Power Capping lets you limit server power use in real time. You can use it as a tool for planning and managing power and cooling requirements in the data center. Using HP SIM or ICpm, you can provision a power distribution unit or a rack of servers to less than the total of the servers' faceplate ratings. This can reclaim power and cooling capacity hidden by overly conservative policies based on faceplate ratings. To implement Dynamic Power Capping, iLO works with a power microcontroller to measure and control power use. The power microcontroller keeps the server power use under a power cap value and adjusts processor performance if needed. You can set a power cap for an individual server from the iLO Advanced user interface. For multiple rack-mount servers, you can set the power caps from the power management module within ICpm. Dynamic Power Capping is OS independent, so it will function even if the OS fails. Since an aggressive power cap can affect server performance, you should only set a power cap value that matches or exceeds the highest observed power consumption for a representative workload. For a more detailed explanation of Dynamic Power Capping, see the ―HP Power Capping and HP Dynamic Power Capping for ProLiant servers‖ paper. HP Enclosure Dynamic Power Capping We designed Enclosure Dynamic Power Capping technology specifically for BladeSystem enclosures. It lets you set a power cap on an enclosure by using ICpm (version 2.0 or later) or Onboard Administrator (firmware version 2.30 or later). The Onboard Administrator monitors and maintains the enclosure's power cap by adjusting cap levels on individual server blades. Special hardware on each server blade can adjust the processor performance states (P-states) and the processor clock to keep the server's energy use below the cap. The total power for an enclosure includes the power for the server blades and unmanaged devices such as I/O peripherals (switches) and cooling fans. The Onboard Administrator cannot control these unmanaged devices, so it calculates a maximum power budget for the server blades. With the blade power budget as its limit, the Onboard Administrator uses a sophisticated algorithm to increase the power caps of busier server blades and decrease the caps of less busy server blades. The Onboard Administrator repeats the power reallocation process every 20 seconds. Normally, when the Onboard Administrator receives new work, it can quickly raise a power cap for an idle server blade 8