User`s guide

Configuration
36 Eaton Intelligent Power Manager (IPM) User’s Guide v1.40 P-164000289—Rev 2
Manual Blade-level Power Capping
When manual blade-level power capping is configured in the global cap policy, you can manually set a power
cap for each blade server in a Cisco UCS instance.
If the server encounters a spike in power usage that m
eets or exceeds the maximum configured for the server,
Cisco UCS Manager does not disconnect or shut down the server. Instead, Cisco UCS Manager reduces the
power that is made available to the server. This reduction can slow down the server, including a reduction in
CPU speed.
Figure 33. Manual Blade Power Capping
Power Control Policy and Priority
Cisco UCS uses the priority set in the power control policy, along with the blade type and configuration, to
calculate the initial power allocation for each blade within a chassis. During normal operation, the active blades
within a chassis can borrow power from idle blades within the same chassis. If all blades are active and reach
the power cap, service profiles with higher priority power control policies take precedence over service profiles
with lower priority power control policies.
Priority is ranked on a scale of 1-10, where 1 indicates the highest priority and 10 indicates lowest priority. The
d
efault priority is 5.
For mission-critical applications, a special power priority cal
led no-cap is also available. Setting the priority to
no-cap prevents a Cisco UCS from leveraging unused power from that particular blade server. The server is
allocated the maximum amount of power that the blade can reach.