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The Design and Organization of Data Centers/Redundancy

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Everything will eventually fail. Redundancy allows you to minimize the damage of a system failure.

Failure characteristics

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Planned vs. unplanned

Total vs. partial

Frequency of failure

Length of partial failure or outage

Types of redundancy

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Structure

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Ladder

Mesh

N+1

Implementation

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Active/active

Active/passive

Human Factors

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Notification

Unattended problem resolution

Documentation and problem clarity

Allowance for no-impact maintenance