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[edit]

Planned vs. unplanned

Total vs. partial

Frequency of failure

Length of partial failure or outage

Types of redundancy[edit]

Structure[edit]

Ladder

Mesh

N+1

Implementation[edit]

Active/active

Active/passive

Human Factors[edit]

Notification

Unattended problem resolution

Documentation and problem clarity

Allowance for no-impact maintenance