THIS "BACKUP" PSU CAN BECOME A $37 - A - YEAR IDLE TAX - AND REMOVING IT ALSO REMOVES YOUR SAFETY NET.
the clip compares two Dell PowerEdge R720 servers:
168W
140W
that 28W gap running 24/7 equals 245 kWh a year, or about $37 at $0.15 per kWh.
the reason lives inside iDRAC.
Hot Spare lets one redundant PSU sleep while the other carries the load.
Not Redundant lets the server run without PSU failover.
the creator removes one supply and switches the policy to Not Redundant.
honest line: those readings come from two machines, not a controlled A/B test.
CPUs, drives, workload and PSU efficiency can all change the result.
the setting can cut wasted power.
a failed PSU can now cut the server.
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