How should the Hitachi Unified Storage systems dual power supplies be connected?

Question

Options

• Aby FS6 circuits breakers
• Bonly one should be connected, the other being standby
• Cby adjacent sockets on a single power distribution unit
• Dby two independent and appropriately rated power distribution units

• A
  4% (1)
• B
  8% (2)
• D
  88% (23)

Explanation

Dual power supplies must connect to two independent, appropriately rated PDUs (option D) to achieve true redundancy - if one PDU loses power due to a circuit fault, tripped breaker, or maintenance, the system continues running on the other. Option A is wrong because FS6 circuit breakers are an unrelated switching/protection component, not a power distribution strategy. Option B defeats the purpose of dual supplies entirely; standby-only configurations introduce failover delay and a single point of failure during switchover. Option C is the most dangerous distractor - plugging both supplies into the same PDU means a single PDU failure takes down both supplies simultaneously, giving you zero redundancy despite having two units.

Memory tip: Think "dual supply = dual source." If both cables trace back to the same box (one PDU), you have one real power source wearing two hats - that's not redundancy, that's a false sense of security.

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