Filter
Top Products
Any change to the manual blade-level power cap configuration will result in the loss of any groups or
configuration options set for policy-driven chassis group power capping.
Important
Configuring the Global Cap Policy
Procedure
Step 1
In the Navigation pane, click the Equipment tab.
Step 2
On the Equipment tab, click the Equipment node.
Step 3
In the Work pane, click the Policies tab.
Step 4
Click the Global Policies subtab.
Step 5
In the Global Cap Policy area, click one of the following radio buttons in the Allocation Method field to
determine the power cap management mode used in the Cisco UCS domain:
• Manual Blade Level Cap—Power allocation is configured on each individual blade server in all chassis.
If you select this option, you cannot create power groups.
• Policy Driven Chassis Group Cap—Power allocation is configured at the chassis level through power
control policies included in the associated service profiles. If you select this option, you can also create
power groups that contain one or more chassis in the Cisco UCS domain.
By default, power allocation is done for each chassis through a power control policy.
Step 6
Click Save Changes.
Configuring Policy-Driven Chassis Group Power Capping
Policy-Driven Chassis Group Power Capping
When policy-driven power chassis group power capping is selected in the global cap policy, Cisco UCS can
maintain the oversubscription of servers without risking costly power failures. This is achieved through a
two-tier process. At the chassis level, Cisco UCS divides the amount of power available between members
of the power group. At the blade level, the amount of power allotted to a chassis is divided between blades
based on priority.
Each time a service profile is associated or disassociated, UCS Manager recalculates the power allotment for
each blade server within the chassis. If necessary, power from lower-priority service profiles is redistributed
to higher-priority service profiles.
UCS power groups cap power in less than one second in order to safely protect data center circuit breakers.
A blade must stay at its cap for 20 seconds before the chassis power distribution is optimized. This is
intentionally carried out over a slower timescale to prevent reacting to transient spikes in demand.
Cisco UCS Manager GUI Configuration Guide, Release 2.0
OL-25712-04 565
Configuring Policy-Driven Chassis Group Power Capping