Restrictions

You cannot issue the IXLCONN macro from the master address space.
The maximum number of connections to a structure in the coupling facility depends on:
- The number of CONNECT records in the active CFRM policy.
  The default number of CONNECT records you can specify is 32; the maximum allowed is 255.
- The limit imposed by the coupling facility control code.
  This limit is model-dependent. CFLEVEL=0 or 1 for a coupling facility allows up to 32 connections for all structure types. For CFLEVEL values that are in the range CFLEVEL=2 to CFLEVEL=16 including a CFLEVEL=16 coupling facility allows up to 255 connections for a cache structure and 32 connections for a list or lock structure. A CFLEVEL=17 or higher coupling facility allows up to 255 connections for all structure types.
- The address space limit of 128 PASN–AL entries for serialized structures per address space. (The lock structure and the serialized list structure are “serialized structures.")
- The application-specified value of the NUMUSERS or MAXCONN keyword on a request to connect to a list structure.
- The application-specified value of the NUMUSERS or MAXCONN keywords on a request to connect to a lock structure.
- The lock table entry size for serialized list and lock structures. The architected z/OS® limit on the lock table entry size for serialized list structures limits the number of connectors that can be represented by the lock table entry to 127. The architected z/OS limit on the lock table entry size for lock structures limits the number of connectors that can be represented by the lock table entry to 247.