Maintaining the XRF complex during tracking

Maintaining an Extended Recovery Facility (XRF) complex requires that you know how to change surveillance dynamically, how to update system data sets, and how to suspend operations on the active or the alternate subsystem.

Although an end user cannot log on to the alternate subsystem during the tracking phase, the master terminal, secondary master terminal, optional ISC link between two subsystems, and the system console can communicate with the alternate.

You can enter the following commands on the alternate subsystem during tracking:
/DISPLAY
Use the /DISPLAY command to display relevant tracking and other information for an XRF complex.
/OPNDST NODE
/CLSDST NODE
Use these commands to open and close VTAM® sessions for the master terminal and the ISC link. These commands can reestablish backup sessions for class-1 terminals that have active sessions, if USERVAR is used. Backup sessions are not maintained in XRF systems with MNPS.

If the active IMS has a session that is XRF capable, enter /OPNDST command on the alternate subsystem to establish a backup session, if it does not already have one.

In order to use the /OPNDST command successfully for a class-1 ETO terminal, the control blocks must exist and be coupled together, and an active session must exist on the active system. If not, IMS rejects the /OPNDST command, and issues message DFS3862.

/START LINE x PTERM y
/STOP LINE x PTERM y
/RSTART LINE x PTERM y
Use these commands to start, stop, and restart non-VTAM master and secondary master terminals.
/START NODE x
/STOP NODE x
/RSTART NODE x
Use these commands to start, stop, and restart VTAM master and secondary master terminals.
/START REGION
/STOP REGION
Use these commands to start and stop regions.
/START SURV
/STOP SURV
/CHANGE SURV
Use these commands to dynamically stop and start surveillance and to dynamically change surveillance values.