User's Manual

Carrier Grade Chassis Management Controller User’s Guide Addendum 35
Redundancy
Policy
Displays the current redundancy configuration: AC Redundancy,
Power Supply Redundancy, and No Redundancy.
• Grid Redundancy - Power input is load-balanced across all
PSUs. Half of them should be cabled to one power grid and the
other half should be cabled to another grid. When the system is
running optimally in Grid Redundancy mode, power is load-
balanced across all active supplies. In case of a grid failure, the
PSUs on the functioning power grid take over without
interruption.
•
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 may not use all six PSUs; it uses
sufficient PSUs to assure that on the failure of any one the
remaining can continue to supply power to the chassis. The
other PSUs may be placed in Standby mode if DPSE is enabled.
•
No Redundancy - The power from all active PSUs is sufficient
to power the entire chassis, including the chassis, servers, I/O
modules, iKVM, and CMC. The remaining PSUs may be placed
in standby mode if DPSE is enabled.
CAUTION: The No Redundancy mode uses only the minimum
required number of PSUs at a time, with no backup. Failure of one
of the PSUs in use could cause the server modules to lose power
and data.
Dynamic Power
Supply
Engagement
Displays whether Dynamic Power Supply Engagement is enabled
or disabled. Enabling this feature allows 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 1-11. System Power Policy Configuration
Item Description