What is High Availability and Disaster Recovery?
High Availability
High availability refers to providing an agreed level of system or application availability by minimizing the downtime caused by infrastructure or hardware failure.
When the hardware fails, there's not much you can do other than switch the application to a different computer so as to make sure that the hardware failure doesn't cause application downtime.
Disaster Recovery
Business continuity and disaster recovery, though used interchangeably, are different concepts.
Disaster recovery refers to re-establishing the application or system connectivity or availability on an alternate site, commonly known as a DR site, after an outage in the primary site. The outage can be caused by a site-wide (data center) wide infrastructure outage or a natural disaster.
Business continuity is a strategy that ensures that a business is up and running with minimal or zero downtime or service outage. For example, as a part of business continuity...
