What is the minimum number of UPS modules used in a distributed redundant configuration?

Question

Options

• AOne
• BTwo
• CFour
• DThree

• A
  7% (1)
• B
  13% (2)
• C
  7% (1)
• D
  73% (11)

Explanation

A distributed redundant UPS configuration requires a minimum of three modules because true distributed redundancy demands at least two modules actively sharing the load (the "distributed" part) plus one additional module to provide the redundancy (the "redundant" part), following an N+1 model where N must be at least 2.

Option A (one module) is wrong because a single UPS provides no redundancy at all - if it fails, everything goes down. Option B (two modules) describes a basic active/standby or parallel configuration, not distributed redundancy; with only two units, losing one leaves no failover capacity beyond a single remaining unit with no backup. Option C (four modules) is a valid distributed redundant configuration but not the minimum - three units satisfy the requirement.

Memory tip: Think "distribute then protect" - you need at least 2 to distribute the load, then add 1 more to protect against failure, giving you 2+1 = 3 as the floor for distributed redundancy.

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