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Setting the CMM power management policies

You can use the CMM web interface to view the power information, based on projected power consumption, and configure power management for the Flex System chassis.

The CMM web interface provides options to view or configure policies related to power redundancy and power limiting. The Power Management Policy provides options for configuring power redundancy to protect your chassis in the case of a power supply failure.

The following options are available for the Power Management Policy:
  • AC Power Source Redundancy - Intended for dual AC power sources into the chassis. Maximum input power is limited to the capacity of half the number of installed power modules. This is the most conservative approach and is recommended when all power modules are installed. When the chassis is correctly wired with dual AC power sources, one AC power source can fail without affecting compute node server operation. Note that some compute nodes may not be allowed to power on if doing so would exceed the policy power limit.
  • AC Power Source Redundancy with Compute Node Throttling Allowed - Very similar to the AC Power Source Redundancy. This policy allows higher input power, however capable compute nodes may be allowed to throttle down if one AC power source fails.
  • Power Module Redundancy - Intended for a single AC power source into the chassis where each Power Module is on its own dedicated circuit. Maximum input power is limited to one less than the number of Power Modules when more than one Power Module is present. One Power Module can fail without affecting compute node operation. Multiple Power Module failures can cause the chassis to power off. Note that some compute nodes may not be allowed to power on if doing so would exceed the policy power limit.
  • Power Module Redundancy with Compute Nodes Throttling Allowed - Very similar to Power Module Redundancy. This policy allows higher input power; however, capable compute nodes may be allowed to throttle down if one Power Module fails.
  • Basic Power Management - Maximum input power is higher than other policies and is limited only by the nameplate power of all the Power Modules combined. This is the least conservative approach, since it does not provide any protection for AC power source or Power Module failure. If any single power supply fails, compute node and/or chassis operation may be affected.
The Power Limiting/Capping Policy provides options to limit the total amount of power that the chassis and components are allowed to consume. The following options are available for the Power Limiting/Capping Policy:
  • No Power Limiting - Maximum input power will be determined by the active Power Redundancy policy.
  • Static Power Limiting - Sets an overall chassis limit on the maximum input power. In a situation where powering on a component would cause the limit to be exceeded, the component would not be permitted to power on.

Use this information to help you configure the Power Management Policy and Power Limiting/Capping Policy for your chassis:

  1. From the CMM web interface homepage, click Chassis Management > Power Modules and Management.
    Illustration of the CMM web interface Power Modules page, Power Policies tab

  2. Click Change to view or change the Power Management Policy, and click OK to save any changes that were made.
  3. Click Change to view or change the Power Limiting/Capping Policy, and click OK to save any changes that were made.