Controlling VTAM generic resource member selection

You can control VTAM®'s selection of a generic resource member for a terminal when the terminal logs on. To control the selection process, use either the VTAM Generic Resource Resolution exit routine (ISTEXCGR) or the z/OS® Workload Manager.

Choosing between these facilities depends on the needs of your application program and on your installation requirements.

The criteria that VTAM uses to select a generic resource member are:

1. Existing affinity. VTAM maintains an affinity table in a list structure called ISTGENERIC on the coupling facility.
2. VTAM Generic Resource Resolution exit routine (ISTEXCGR).
3. z/OS Workload Management.
4. Current session counts.

Related reading:

• For more information on the VTAM Generic Resource Resolution exit routine (ISTEXCGR), see z/OS Communications Server: SNA Customization.
• For more information on the z/OS Workload Management, see z/OS MVS Planning: Workload Management and z/OS MVS Programming: Workload Management Services.