In a Generic Resource environment, a user logging on to CA-TPX is routed into one of the TPX images that build the Generic Resource.
This can be accomplished by any of the three processes detailed below:
- VTAM session balancing: VTAM will use the terminal session counts provided by VTAM's Coupling Facility to balance the number of active terminal sessions on each Unicenter CA-TPX instance.
- VTAM calls to the z/OS Workload Manager (WLM): After making the selection based on the session counts, the VTAM network node calls IBM WLM, which can override the instance chosen using VTAM's own logic.
- VTAM Generic Resource exit: VTAM will call the user-written VTAM generic resource exit (if one exists), which will override the first two choices.