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Please analyze RCMS and PMH I've mentioned in this RFE. In our case ONE regulator was faulty and had to be replaced - but server has turned off and we were unable to power it on until this regulator has been replaced.
We do have redundancy built into the CPU voltage regulators for the E850C. Without going into a lot of detail, the regulators are designed with one additional integrated current engine to allow the system to tolerate one engine failure. For example, one of the DC outputs of the regulator requires 7 current engines to supply all of the current required by the processor. What is actually implemented on the regulator is 8 current engines.
Not sure what happened with the fail that you mentioned in your request since we do have redundancy already on the regulator. It would require some failure analysis to determine what caused the fail.