Information about High availability, Fault Tolerance, and Disaster Recovery

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Exam Tips:
- High availability:
  - Recover from a failure.
  - Does not mean avoiding all failures/faults.
  - Means taking steps to avoid failures, or minimize failures when they do happen, or recover more quickly from failures.
- Fault Tolerance:
  - Have multiple redundancy.
  - Allow system to operate even if only one of the resources is available.
  - System assumes failure and can run through failure.
  - More expense - parallel resources.
- Disaster Recovery:
  - Solely concerned with protecting the existing data for use for recreating the systems.