Fault-tolerant power control in a computer system

A method of controlling power applied to an enclosure having a plurality of computing devices, comprising:

• identifying, at a first controller of a first power zone, a fault in a second power zone;
• obtaining first input power measurements for the first power zone from a primary power meter in the first power zone;
• obtaining power measurements for the second power zone from an alternative power meter in the second power zone;
• computing second input power measurements for the second power zone using the power measurements from the alternative power meter in the second power zone;
• and
• computing total input power consumed from the first and second input power measurements.

An enclosure for a plurality of computing devices, comprising:

• a power subsystem to manage power for the computing devices attached to the enclosure, the power subsystem including:
• a first power zone having a first primary power meter measuring a first input power feed, a first alternative power meter measuring power supplied by the first input power feed, and a first controller;
• a second power zone having a second primary power meter measuring a second input power feed, a second alternative power meter measuring power supplied by the second input power feed, and a second controller;
• wherein the first controller receives measurements from the first primary power meter, and the second alternative power meter;
• and
• wherein the second controller receives measurements from the second primary power meter, and the first alternative power meter.