User's Manual

40 Carrier Grade Chassis Management Controller User’s Guide Addendum
Redundancy Policy This option allows you to select one the following options:
No Redundancy
: Power from the power supplies is used
to power the entire chassis, including the chassis, servers,
I/O modules, iKVM, and CMC. No power supplies must
be kept in reserve.
NOTE: The No Redundancy mode uses only the minimum
required number of power supplies at a time. If the minimum
number of PSUs are installed, then there is no backup
available. Failure of one of the three power supplies being
used could cause the servers to lose power and/or data. If
more than the minimum required number of PSUs are
present, then the additional PSUs may be placed in Standby
mode for improving power efficiency if DPSE is enabled.
Power Supply Redundancy:
The capacity of the highest-
rated power supply in the chassis is kept in reserve,
ensuring that a failure of any one power supply does not
cause the server modules or chassis to power down (hot
spare).
Power Supply Redundancy mode may not utilize all
installed power supplies. Any additional power supplies, if
present, may be placed in Standby mode for improving
power efficiency, when DPSE is enabled. Power Supply
Redundancy mode prevents server modules from
powering up if the power consumption of the chassis
exceeds the rated power. Failure of two power supplies
may cause some or all server modules in the chassis to
power down. Server module performance is not degraded
in this mode.
Grid Redundancy:
This mode divides half the PSUs into
two power grids (for example, PSUs 1-3 make up power
grid 1 and PSUs 4-6 make up power grid 2). Failure of a
PSU or loss of input power to one grid reports the
redundancy status as lost.
Table 1-15. Configurable Power Budget/Redundancy Properties
Item Description