The Design and Organization of Data Centers/Redundancy
Everything will eventually fail. Redundancy allows you to minimize the damage of a system failure.
Failure characteristics
[edit | edit source]Planned vs. unplanned
Total vs. partial
Frequency of failure
Length of partial failure or outage
Types of redundancy
[edit | edit source]Structure
[edit | edit source]Ladder
Mesh
N+1
Implementation
[edit | edit source]Active/active
Active/passive
Human Factors
[edit | edit source]Notification
Unattended problem resolution
Documentation and problem clarity
Allowance for no-impact maintenance