Cisco UCS Manager provides the ability to manage power utilization to the blades. Which two statements about UCS Manager power policies are true? (Choose two.)
A. Power capping helps mainly in reducing data center footprint.
B. Power capping helps reduce data center cooling.
C. A single power cap group policy allows you to set power limits across multiple UCS domains.
D. You can have multiple power cap groups per UCS domain.
E. Each blade within a UCS 5108 chassis can belong to a separate power cap group.
Correct Answer: BD
Explanation/Reference:
Explanation:
Power capping is one of the main differentiators of the Cisco Unified Computing System. This feature provides increasing benefits as each individual Cisco UCS instance scales. Power capping is the capability to limit the power consumption of a system, be it a blade server or a rack server, to some threshold that is less than or equal to the system’s maximum rated power.
For example, if the maximum power rating of a blade server is 340 watts (W), but the power available to the chassis is only 3334W AC, which is sufficient to supply an average of 300W per blade, plus the chassis, in the Cisco UCS chassis, each blade can be capped at a maximum of 300W per blade to avoid exceeding the capacity of the power supply. This type of capping is known as static power capping. Although it helps ensure that the chassis will never draw more power than allowed, it does not take into account that the various blades may have varying loads, and at any given time one blade may not be using its full allotment of power while another may require more.
Another type of capping, dynamic power capping, allows the power management system to allocate the total pool of power across multiple blades in a chassis. With dynamic power capping, the system as a whole can conform to a specific power budget, but power can be steered to the blades that have higher load and require additional power.
To date, dynamic power capping offerings on the market have been limited to a single blade chassis or chassis as their managed power domain, as discussed previously. The following sections describe how Cisco has extended dynamic power capping across multiple blade chassis and implemented it in a fashion that is more useful to operations management than the other, traditional alternatives.
Reference: http://www.cisco.com/c/en/us/solutions/collateral/data-center-virtualization/unified-computing/white_paper_c11-627731.html
