Set CMM Power Supply Redundancy
Before You Begin
Oracle ILOM CMM firmware
version 3.1.1 or later is required.
A minimum of two power supply units (PSU) must be
initially installed within the blade system chassis to support the
Power Supply Redundancy Policy.
Note - The Sun Blade 6000 PSUs contain two power sides. The
Sun Blade 6048 PSU contains three power sides. It is possible for
system administrators to shut down one side of the PSU by enabling
the system management policy for Light Load Efficiency Mode (LLEM).
The LLEM supports both redundant and non-redundant PSUs.
The Admin (a) role is required in Oracle ILOM to
modify the CMM grant limit property.
The Power Supply Redundancy Policy controls the
amount of power the CMM reserves from each PSU in case of a PSU
failure. The CMM Power Supply Policy is set, by default in Oracle
ILOM, to reserve half the power (N+N) from each PSU. If a PSU fails
within the blade chassis, the CMM allocates the reserved power from the
remaining PSU to prevent a power loss to the chassis system components.
System administrators can choose to accept the default Power
Supply Redundancy Policy (N+N) or disable it.
Note - When the PSU redundancy policy is modified, the modification
will affect the power wattage the CMM is permitted to allocate to
the CPU blade servers. For instance, when the redundancy policy
is enabled (N+N), the CMM will re-adjust the Peak Permitted power
to the wattage the PSU(s) can provide minus the wattage being reserved.
If the redundancy policy is disabled and a PSU fails, the CMM will reduce
the wattage for the Peak Permitted system power. If the Peak Permitted system
wattage is reduced below the already Allocated Power wattage, the
system administrator should take steps to power off the CPU blade
servers to reduce the chassis power allocation.
This procedure provides both web and CLI CMM instructions.
set the CMM Power Supply Redundancy Policy, perform one of the following
Oracle ILOM interface procedures:
Click Power Management > Redundancy.
Enable one of the following power redundancy policies:
N+N (default) – When
enabled, the CMM reserves half the power from each chassis PSU for power
- or -
None – When
enabled, the redundant PSU policy configuration is disabled.
Click Save to apply the changes.
set /CMM/powermgmt redundancy=redundancy|none
redundancy (default) – When
set, the CMM reserves half the power from each chassis PSU for power
none – When set, the redundant
PSU policy configuration is disabled.