The Difference Between Disaster Recovery & High Availability

High Availability

  • High availability is a way you can design your compute  to minimize downtime.
  • Eliminating single points of failure is the core protocol of high availability.
  • High availability protects you from hardware failure but no data loss. Therefore, it is useful for planned outages such as maintenance.
  • High availability – Synchronous

Disaster Recovery

  • Disaster recovery is central for dealing with worst-case scenarios to get your storage systems up as quickly as possible. It is meant to give you protection from situations that could otherwise be lethal to your business.
  • Having a geographically separated backup is at the core of disaster recovery.
  • Disaster recovery solutions often contain high availability in their design, especially if they are clustered. Unfortunately, availability is something many with the forethought to plan for disaster recovery also plan for.
  • Disaster recovery is a higher-level implementation that consists of a combination of a plan and technology design. High availability is much more about the technology design, combining failovers and redundancy to eliminate single points of failure.
  • Disaster recovery – Asynchronous