Specific APPC/MVS Support

Specific system support for APPC/MVS consists of:

• Two parmlib members, one to contain definitions for the APPC address space (APPCPMxx) and the other to contain definitions for the APPC/MVS transaction scheduler address space (ASCHPMxx).

  APPCPMxx

  Names APPC/MVS local logical units (LUs) and the administrative VSAM KSDSs. It also sets up a correspondence between local LUs and transaction schedulers, and, optionally, defines LUs that are not to be associated with schedulers ("NOSCHED" LUs).

  ASCHPMxx

  Defines classes for the APPC/MVS transaction scheduler that determine scheduling characteristics, such as the response time goal for TPs running in a class.

• APPC implementation through MVS system commands:
  • START command initiates the APPC and ASCH address spaces.
  • SET command specifies the parmlib member or members whose definitions are to dynamically modify APPC and ASCH characteristics.
  • DISPLAY command displays current communication configurations, information about queued and running transactions, information about active conversations, and information about APPC/MVS server address spaces and allocate queues.
  • CANCEL command terminates local TPs and cancels the APPC and ASCH address spaces.
  • STOP command terminates an initiator address space.
  • TRACE, TRACK, and STOPTR help with recovery and diagnostics associated with APPC/MVS TPs.
• Interactive problem control system (IPCS) subcommands, APPCDATA and ASCHDATA, that aid in problem determination for APPC/MVS.
• System resource manager (SRM) performance management of TPs scheduled under the APPC/MVS transaction scheduler and based on installation performance criteria for all TPs, individual TPs, TP initiator classes, or account numbers.
• Resource Measurement Facility (RMF) monitoring of TP performance.
• System management facility (SMF) accounting for conversations by any TP and for resources used by TPs scheduled under the APPC/MVS transaction scheduler.