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Supported PSU number in UCS B-Series Chassis.

With the firmware version 1.3 or  below, 1 PSU can operate the UCS B-Series chassis with "Non-Redundant  mode", if the power consumption in chassis is less than 2500w.

http://www.cisco.com/en/US/docs/unified_computing/ucs/hw/chassis/install/5108_HIG.pdf

P.1-13

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Smaller configurations (requiring less than 2500W) can be powered by a single power supply.

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Thus, the required PSU number for each power redundant modes are as below:

<Chassis power consumption is less than 2500W>

No Redundant     => PSU * 1

N+1                         => PSU * 2

Grid                         => PSU * 2

<Chassis power consumption is 2500W or abve>

No Redundant     => PSU * 2

N+1                         => PSU * 3

Grid                         => PSU * 4

However,  starting from firmware release 1.4, the required PSU number is always  same as below regardless the power consumption of the chassis.Please  note that this currently(6/24/2011) IS NOT documented.

No Redundant     => PSU * 2

N+1                         => PSU * 3

Grid                         => PSU * 4

Otherwise, "Power Redundancy Failed" error will be logged in CIMC.

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