HP BL460c Managing the HP BladeSystem c-Class systems, 2nd edition - Page 10

On the Rack Overview page (Figure 9), the Onboard Administrator summarizes the power and thermal information for all the c-Class enclosures linked in a rack. The information displayed includes the present power for each enclosure, the ambient temperature of the enclosure, and a rack cooling requirement in BTU/hr. This display dramatically reduces the complexity of monitoring the power and cooling requirements for a rack full of server blades. Figure 9. Rack Power and Thermal page via Onboard Administrator web GUI Dynamic Power Savings mode is the default power supply setting. The Onboard Administrator manages this mode based on the principle that power supplies operate less efficiently when lightly loaded and more efficiently when heavily loaded. A typical power supply running at 20 percent load could have efficiency as low as 60 percent; but running at 50 percent load, the power supply efficiency could be 90 percent, thus providing significant savings in power consumption. Using real time tracking of the total enclosure power consumption, the Onboard Administrator will shut down or start up power supplies as required to maintain the power supplies and current load requirements ratio in the maximum efficiency range. The number of power supplies active at any given time is determined by calculating the number of power supplies necessary to maintain the power load requirements and to keep the active power supplies in the high efficiency range. When Dynamic Power Savings mode is enabled, some of the power supplies may be automatically placed on 10