What Is High Availability (HA)?
Search Data Center, Tuesday, April 23rd, 2024
High availability (HA) is the ability of a system to operate continuously for a designated period of time even if components within the system fail. A highly available system meets an agreed-upon operational performance level by eliminating single points of failure.
This is accomplished by including redundant components that serve as backups that can assume processing if failure should occur. In information technology (IT), a widely held but difficult-to-achieve standard of availability is known as five-nines availability, which means the system or product is available 99.999% of the time.