From a networking point of view, an eServer is a separate server in a DSA system, and
requires a DSA license for each server that it subscribes to.
For more information about eServers, see 'Configuring eServer' in the Station Configuration
Guide.
For information about the security aspects of eServer, see the Network and Security Planning
Guide.
PHD
Process Historian Database (PHD) collects, stores, and replays continuous and other historical
plant data. While PHD resides on a separate node from Experion servers, they can interact,
enabling PHD to store long-term history data. PHD provides a more compact storage
mechanism.
Servers
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