SK0-004 · Question #391
A server has two power supplies. If power is lost to the second power supply, which of the following will occur?
The correct answer is B. The server will remain in operation. Dual power supplies provide redundancy so a server continues operating if one PSU loses power.
Question
A server has two power supplies. If power is lost to the second power supply, which of the following will occur?
Options
- AThe server will gracefully shut down
- BThe server will remain in operation
- CThe automatic transfer switch will bring in generator power
- DThe UPS will exceed maximum load
How the community answered
(68 responses)- A1% (1)
- B87% (59)
- C4% (3)
- D7% (5)
Why each option
Dual power supplies provide redundancy so a server continues operating if one PSU loses power.
A graceful shutdown would defeat the purpose of redundant power supplies, which exist specifically to prevent downtime during a single PSU failure.
Servers with redundant power supplies are designed to operate on a single PSU if the other fails. The remaining power supply carries the full load, keeping the server running without interruption. This is the core purpose of redundant PSU configurations in enterprise hardware.
An automatic transfer switch operates at the facility or rack PDU level to switch between utility and generator power, not in response to a single server PSU failure.
UPS maximum load is unrelated to a single PSU losing power on a server that has a second PSU still receiving power.
Concept tested: Redundant power supply server fault tolerance
Source: https://learn.microsoft.com/en-us/windows-hardware/design/component-guidelines/power-supply-units
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