Dell SonicWALL Secure Mobile Access 8.5
Administration Guide
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329
High Availability Configuration
This section provides information and configuration tasks specific to the High Availability page on the Dell
SonicWALL Secure Mobile Access web-based management interface.
High Availability allows two identical SMA/SRA appliances or SMA 500v Virtual Appliances to provide a reliable,
continuous connection to the public Internet. The two SMA/SRA appliances are deployed at the same time and
connected together, and are called a High Availability Pair (HA Pair).
To p i c s:
• High Availability Configuration on page 329
• Configuring High Availability on page 330
• Technical FAQ on page 336
High Availability Overview
High Availability requires one SMA/SRA appliance configured as the primary device, and an identical SMA/SRA
configured as the backup device.
Figure 57. High availability configuration
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 transitions to the active state
and begins to service outside connections. The necessary data is synchronized between primary and backup
devices, including settings data and session data.
The failover applies to loss of functionality or network-layer connectivity on the primary appliance. 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.
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