User's Manual

272 Power Management
Redundancy
Policy
Indicates the current redundancy configuration: AC Redundancy,
Power Supply Redundancy, and No Redundancy.
AC Redundancy—Power input is load-balanced across all PSUs.
Half of them should be cabled to one AC grid and the other half
should be cabled to another grid. When the system is running
optimally in AC Redundancy mode, power is load-balanced across
all active supplies. In case of a grid failure, the PSUs on the
functioning AC grid take over at 100% capacity.
Power Supply Redundancy — The capacity of the highest-rated
PSU in the chassis is held in reserve, ensuring that a failure of any
one PSU does not cause the server modules or chassis to power
down.
Power Supply Redundancy does not use all six PSUs; it uses a
maximum of four PSUs and the other PSUs may be placed in
Standby mode if DPSE is enabled.
No Redundancy — The power from all three PSUs on one
AC circuit (grid) is used to power the entire chassis, including
the chassis, servers, I/O modules, iKVM, and CMC.
CAUTION: The No Redundancy mode uses only three PSUs at
a time, with no backup. Failure of one of the three PSUs in use
could cause the server modules to lose power and data.
Dynamic Power
Supply
Engagement
Indicates whether Dynamic Power Supply Engagement is
enabled or disabled. Enabling this feature allows the CMC to put
under-utilized PSUs into standby mode based on the redundancy
policy that is set and the power requirements of the system. Putting
under-utilized PSUs into standby mode increases the utilization,
and efficiency, of the online PSUs, saving power.
Table 8-12. System Power Policy Configuration
(continued)
Item Description