Specifications

Configuring Stations for Server Redundancy
PlantScape Server and Client Configuration Guide 317
Configuring Stations for Server Redundancy
Stations need to connect to whichever server is running as the primary server.
However, for local and network-connected Stations to always connect to the
server running as primary requires special Station configuration. How this is done
for single and dual networks is described in the following sections.
Single Network Configuration
In a single network configuration when a Station connection to the primary
server is lost (or the primary server fails), the Station should attempt to connect to
the backup server.
Similarly when the backup server stops running as primary, the Station should try
to reconnect to the primary server.
You can configure Station to do this by configuring an auxiliary setup file. The
auxiliary setup file contains the name of the server to connect to if the current
connection is lost (or the current server fails).
In the case of a single network configuration, two Station setup files are required:
• default.stn which connects to hsserva (and has auxiliary setup file
hsservb.stn)
• hsservb.stn which connects to hsservb (and has auxiliary setup file
default.stn)
When Station is started, it connects to hsserva (as configured in default.stn).
If hsserva fails (or connection to hsserva is lost), Station reconnects to hsservb (as
configured in the auxiliary setup).
For details on configuring setup files see “Configuring Station Connections” on
page 63 and “Connection Properties Dialog Box” on page 69.
Dual Network Configuration
Dual network configuration is more complicated than single network
configuration because there are two data paths (networks) via which an operator
Station can connect to the server running as primary.
In dual network configuration when Station connection to the primary server is
lost (or the primary server fails) the Station attempts to connect to the backup
server via the same network.
plscpcg.book Page 317 Monday, May 28, 2001 10:11 AM