User's Manual

Power Management 277
Redundancy Policy This option allows you to select one the following options:
• No Redundancy : Power from all three power supplies on one
AC circuit (grid) is used to power-on the entire chassis,
including the chassis, servers, I/O modules, iKVM, the
and CMC.
NOTE: The No Redundancy mode uses only three power
supplies at a time. If 3 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 three 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 will not cause
the server modules or chassis to power down (hot spare).
Power Supply Redundancy mode does not utilize all
six power supplies, but rather
a maximum of four and
a minimum of two power supplies. Any additional
power supplies, if present, may be placed in Standby mode
for improving power efficiency if 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.
•
AC Redundancy : This mode divides half the PSUs into
two power grids (for example, PSUs 1-3 making up
power grid 1 and PSUs 4-6 making up power grid 2). In this
configuration, all six PSUs are online. Failure of a PSU or
loss of AC power to one grid will report the redundancy
status as lost.
Table 8-16. Configurable Power Budget/Redundancy Properties (continued)
Item Description