High Availability Overview
High Availability requires one SMA appliance configured as the primary device, and an identical SMA appliance configured as the backup device. During normal operation, the primary device is in an active state, and services all connections. The backup device is in an idle state. When the primary device loses connectivity, the backup appliance transitions to the active state and begins to service outside connections. This transition is called “failover.”
Because all data and settings are always synchronized between the primary and backup devices, including settings and data from the current session, when failover occurs, the backup device can take over seamlessly.
Failover occurs any time there is a loss of functionality or network-layer connectivity on the primary appliance. The failover to the backup unit transfers critical services when a physical (or logical) link failure is detected, or when the primary unit loses power.
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