411 REFERENCE · Wikibooks
The Design and Organization of Data Centers/Redundancy
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
Everything will eventually fail. Redundancy allows you to minimize the
damage of a system failure.
Failure characteristics
Planned vs. unplanned
Total vs. partial
Frequency of failure
Length of partial failure or outage
Types of redundancy
Structure
Ladder
Mesh
N+1
Implementation
Active/active
Active/passive
Human Factors
Notification
Unattended problem resolution
Documentation and problem clarity
Allowance for no-impact maintenance