HP ML150 HP Power Capping and Dynamic Power Capping for ProLiant servers techn - Page 9

Figure 3. Apportioning a group power cap to individual servers in the group Group Power Capping Individual Servers 1000 watts (Power supply maximum) 400 watts (Maximum) 320 watts (Apportioned Cap) 200 watts (Minimum) 500 200 170 125 1000 375 305 200 Servers as a Group 3500 watts (Group power supply maximum) 1375 watts (Group maximum) 1115 watts (User set group power cap) 1000 400 320 200 725 watts (Group minimum) For ProLiant ML and DL servers, group power capping apportionment works exactly the same on servers supporting Dynamic Power Capping as those supporting basic Power Capping. For server blades, there is the new and more advanced Enclosure Dynamic Power Capping. Enclosure Dynamic Power Capping Enclosure Dynamic Power Capping is a special implementation of Dynamic Power Capping designed specifically for HP BladeSystem enclosures. In one sense, it is a higher level of power management functionality since an administrator sets and maintains a power cap at the enclosure level and not directly at the server or blade level. In another sense, it can be viewed as a more powerful implementation of group power capping for an enclosure, since setting a power cap for the enclosure indirectly creates power caps for the server blades within it. The Onboard Administrator (OA) then actively manages these power caps. Elements of an enclosure power cap With Enclosure Dynamic Power Capping, an administrator sets a power cap for an entire BladeSystem enclosure, not simply for the server blades in the enclosure. Total power consumption for an enclosure is the sum of the power used by of all of the following: The server blades I/O peripherals for the enclosure (interconnects, etc.) 9