CompTIA Server+ SK0-005 Practice Question
An administrator is wiring power for a new rack of twelve 1U virtualization hosts. Each server contains two 750 W hot-swappable power supplies. Two independent 208 V, 30 A circuits feed UPS-A and UPS-B; each UPS feeds its own metered rack PDU (PDU-A and PDU-B). Management requires that every server stay online if any single element in the power path (branch circuit, UPS, PDU, or server power supply) fails and that no circuit breaker trip during such an outage.
Which of the following power-cabling strategies BEST meets the requirement?
Plug both power cords from every server into outlets on PDU-A and leave PDU-B unused for future growth.
Plug both power cords into different outlets on the same PDU but keep that PDU below 80 % of its rated capacity.
Daisy-chain UPS-A to UPS-B so both PDUs can draw from either UPS, then plug both cords for each server into separate outlets on PDU-A.
Connect one cord from each server to PDU-A and the second cord to PDU-B, and keep the normal load on each PDU under about 40 % of its breaker rating.