All Barracuda Spam Firewall models 400 and higher, all firmware versions.
Barracuda Spam Firewalls do not support clustering between different models. There are three reasons for this:
- Different models have different feature-sets. That said, a model 400 would not gain a model 600 feature-set in a cluster situation.
- CPU speed and memory amount vary between different models. A model 400 would not be able to process e-mail as rapidly as its model 600 counterpart, for example. As a result, latency issues would occur in situations where cluster models are ansynchronous.
- The number of smtp connections and spam scanner connections is configured per model. Clustering unlike units would either force a lower end model to use too may resources, or throttle down a higher end model.