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.

Contents

[edit] Failure characteristics

Planned vs. unplanned

Total vs. partial

Frequency of failure

Length of partial failure or outage

[edit] Types of redundancy

[edit] Structure

Ladder

Mesh

N+1

[edit] Implementation

Active/active

Active/passive

[edit] Human Factors

Notification

Unattended problem resolution

Documentation and problem clarity

Allowance for no-impact maintenance

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