Via InterMezzo, Understudy provides sophisticated data replication and content distribution. Thus, if a server fails and drops out of the cluster, all file activity from that server prior to failover will have been accurately replicated on the other servers in the cluster, enabling uninterrupted service. Understudy the only path to high-availability was very expensive hardware switching products or equally expensive specialized software.
Pricing is per server pair.
Volume pricing and site licenses are available by contacting PolyServe directly.