State Synchronization's Role in High Availability
An application is said to be highly available when you have taken steps to minimize single points of failure. In the mid-1990s, several companies introduced High-Availability (HA) software that provided an infrastructure allowing applications to be monitored on the primary system and “failed over” to a secondary system when a failure was detected. The applications were stored on a shared medium (usually a mirrored disk connected to both systems), and state for the applications had to be stored on the shared disk drive. This allowed the secondary system to pick up where the primary system left off. This setup is historically referred to as a warm standby.
Although this was a boon for many companies, ...
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