Recovering terminal sessions

In an XRF system with USERVAR, the alternate subsystem continuously maintains an open backup session for class-1 terminals and switches the terminals to that session during a takeover. If the alternate subsystem fails to reestablish a session with a class-2 terminal, use existing procedures to correct the cause of the failure and reestablish service. Use existing procedures to establish new sessions for class-3 terminals.

If class-1 terminals switch to the alternate subsystem (the new active subsystem), you receive the following messages for them on the master terminal or system console: DFS3859I and DFS3860I saying that all terminal sessions have been switched. If you do not receive these messages, identify the unswitched terminals and issue /CLSDST and /OPNDST commands for them.

If you need to switch many terminals manually, you can use an automated operator program. This program can invoke a set of /DISPLAY NODE, /CLSDST NODE, and /OPNDST NODE commands.