Abstract
High availability (HA) means any system designed to ensure a particular (or estimated particular) operational “uptime” in a year. Therefore, a continuously available database server practically does not have no down time in any given time. HA has essentially come to mean “redundant.” The chapter focuses on various features of SonicWALL firewalls that provide HA. It examines how HA is achieved specifically with SonicWALL firewalls. Configuration examples are provided that can be used as a baseline to architect HA solutions in your own network. HA is about mitigating the risks of failures and bringing them within acceptable, quantifiable bounds, which are part of a larger business strategy. An HA network takes longer to implement, results in more maintenance work, takes longer to gain an understanding of, and because of increased complexity, raises the risks of human error, thus countering your initial goal. HA can be anything from a spare system in a closet to a fully meshed, fully redundant network infrastructure with automatic failure detection and quick convergence.
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