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Power Capping

You can choose the following two cap types through power cap configuration.

  1. Chassis Capping

  2. Nodes Capping

Power cap allows user to set a wattage limit on power consumption. When applied on individual node, the node power consumption is capped at assigned level and when applied on chassis, the whole chassis power consumption is capped. When power saving is enabled, individual node or all nodes (chassis level) runs in modes of different throttling level, depending on the modes chosen.

Figure 1. Chassis Capping
Chassis Capping

  1. Select Chassis Capping or Nodes Capping from the drop-down menu.

  2. Enter a power cap value, check the box, and click on Apply to enable power capping.

  3. Capping enabled (checked) or disabled (unchecked) can be applied independent of capping value. However, if capping is enabled without any input value, FPC display 0w as default value to represents that no user capping value is specified and no capping is enforced. If a value is entered and applied without enable ticked, the value will be saved but not enforced.

  4. Capping range is suggested to user based on the minimum and maximum possible power consumption of the node/chassis. Any value between 1~ 32767W is still allowed even if the value is not set within the suggested range. A capping value of ‘0w’ is not accepted as user input value since it represents no user value specified.

  5. User entered capping value might not be met if capping value entered is lower than the lower bound of suggested range.

  6. Select enable in the Power Save section and click on Apply to activate power save.

  7. Power save can be applied with power cap simultaneously.

  8. The system runs in a throttled state (defined by the implementation) regardless of the workload.

    There are three types of power saving modes and the following table provides details about saving modes.

    Table 1. Saving Mode
    ModeTitle DescriptionSupportability
    DisableStatic maximum performanceThe system runs at full speed (no throttling) regardless of the workloadSupport
    Mode 1Static minimum powerThe system runs in a throttled state (defined by the implementation) regardless of the workloadSupport
    Mode 2Dynamic favor performanceThe system adjusts throttling levels based on workload, attempting to favor performance over power savingsNot Supported
    Mode 3Dynamic favor powerThe system adjusts throttling levels based on workload, attempting to favor power savings over performanceNot Supported