User's Manual

322 Power Management
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.
•
AC 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 AC power to one grid reports the redundancy status as
lost.
Server Performance
Over Power
Redundancy
This option favors server performance and server powerup,
over maintaining power redundancy. For more information
about this feature, see "Server Performance Over Power
Redundancy" on page 301.
Table 9-16. Configurable Power Budget/Redundancy Properties
(continued)
Item Description