I'm not talking multi-unit clusters (more than 2), but multi-site clusters where 2 units are installed in physically separate locations with independent IP information. The SA-Series HA Clustering datasheet lists the following as features: ¥ Multi-unit clusters and cluster pairs for HA and redundancy across the LAN - Cluster pairs supported on SA2500 and SA4500 - Multi-unit cluster or cluster pairs supported on SA6500 ¥ Multi-site clusters for HA and redundancy across the WAN From that list one would assume that multi-site clusters are an option for all SA appliances, but wording in the document text says: In addition, multi-site clusters allow the SA6500 SSL VPN Appliance to be deployed at different locations and even on different IP subnets, while maintaining state information by synching over the WAN and operating on a single usage license. I couldn't find documentation clearly stating whether or not multi-site clusters are supported on all SA appliances or just the SA6500.
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