About high availability and disaster recovery

The goal of a High Availability and Disaster Recovery (HADR) solution is to provide a means to shift data processing and retrieval to a standby system in the event of a primary system failure.

Typically, HA and DR are considered as individual architectures. HA and DR combined treat these concepts as a continuum. If your system is geographically distributed, for example, HA combined with DR can make it both highly available and quickly able to recover from a disaster.