Installed power supplies automatically alternate between being the Active and the Cold Standby.
Is there a way through the Baseboard Management Controller (BMC) or command line that one could make the server switch master PSUs?
There is no Intel® Integrated BMC Web Console option or command by means of which one can manually determine/configure which PSU will be the Master in Cold Redundant state. Installed power supplies automatically alternate between being the Active and the Cold Standby.
For more information, refer to section 5.4 of the Technical Product Specifications document.