High Availability Configuration | 229Chapter 11High Availability ConfigurationThis chapter provides information and configuration tasks specific to the High Availabilitypage on the Dell SonicWALL SRA management interface.High Availability allows two identical SRA 4200 or two SRA 4600 appliances to provide areliable, continuous connection to the public Internet. The two SRA appliances are deployed atthe same time and connected together, and are called a High Availability Pair (HA Pair).This chapter contains the following sections:• “High Availability Overview” section on page 229• “Configuring High Availability” section on page 230• “Technical FAQ” section on page 233High Availability OverviewHigh Availability requires one SRA appliance configured as the primary device, and an identicalSRA 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 backuptransitions to the active state and begins to service outside connections. The necessary data issynchronized between primary and backup devices, including settings data and session data.The failover applies to loss of functionality or network-layer connectivity on the primaryappliance. The failover to the backup unit occurs when critical services are affected, physical(or logical) link failure is detected, or when the primary unit loses power.Supported PlatformsHigh Availability is supported in SRA 5.0 or higher on the SRA 4200, and in SRA 6.0.0.6 orhigher on the SRA 4600.
