SK0-003 · Question #118
Which of the following is the BEST case scenario for power fault tolerance within a server?
The correct answer is B. Redundant power supplies with each connected to a separate power circuit. For server power fault tolerance, the optimal setup is redundant power supplies, each connected to a separate and independent power circuit. This configuration protects against both individual power supply failure and the failure of an entire power circuit.
Question
Which of the following is the BEST case scenario for power fault tolerance within a server?
Options
- ARedundant power supplies with one power supply connected and one power supply as a hot
- BRedundant power supplies with each connected to a separate power circuit.
- CRedundant power supplies connected via a Y-cable.
- DRedundant power supplies with each connected to the same power circuit.
How the community answered
(29 responses)- A14% (4)
- B79% (23)
- C3% (1)
- D3% (1)
Why each option
For server power fault tolerance, the optimal setup is redundant power supplies, each connected to a separate and independent power circuit. This configuration protects against both individual power supply failure and the failure of an entire power circuit.
While having a hot spare power supply helps against PSU failure, connecting only one still makes the server vulnerable to a single point of failure if the connected circuit fails.
Connecting each redundant power supply to a separate power circuit provides the highest level of fault tolerance by protecting against a single power supply failure, a single power circuit failure, or a single power distribution unit (PDU) failure. This ensures the server remains operational even if one power path completely fails.
Connecting redundant power supplies via a Y-cable negates the redundancy, as both power supplies would draw from the same single point of failure upstream, providing no protection if that single point fails.
Connecting both redundant power supplies to the same power circuit offers no fault tolerance against a failure in that specific power circuit or its associated power distribution unit.
Concept tested: Server power fault tolerance best practices
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