Terminology

Polarion - General reference to the Polarion ALM software/server/system.

Instance - A machine running a single Polarion installation.

Stand-alone Instance - An instance, with its own repository on the same machine (i.e. not clustered), exposed to the user as a single Polarion Server.

Cluster - A group of instances accessing the Shared Services, exposed to the user as a single logical Polarion server.

Coordinator - A specially configured Polarion installation that manages communication and licenses among Instances.

Shared Services - A machine that hosts the Subversion repository, shared data and load balancer (user entry point). There is one shared services per Cluster.