Availability Tactics

a = MTBF/(MTBF MTTR)

  • MTBF refers to the mean time between failures.
  • MTTR refers to the mean time to repair.

The term high availability typically refers to designs targeting availability of 99.999% (“5 nines”) or greater.

System Availability Requirements Availability Tactics Diagram

Realizing and Refining Architectural Tactics: Availability