APPC Subsystem on MPE/XL Node Manager's Guide (30294-90007)
Chapter 5 117
Managing the APPC Subsystem
Managing APPC Sessions
Controlling the Number of Sessions
The APPC subsystem supports up to 256 active APPC sessions. By
issuing the APPCCONTROL SESSIONS command, you can vary the
number of active sessions and reapportion active sessions among
different session types.
The following APPCCONTROL STATUS display shows the status of an
example APPC session type at subsystem startup. This session type
will be used in the rest of the examples in this section to illustrate the
effects of the APPCCONTROL SESSIONS command.
--------------------------------------
Independent LU Session Type : INDSESS1
--------------------------------------
Number of Active Sessions : 0
Number of Queued Session Requests : 4
Session Limits
Local LU SNA Node Remote LU Mode Maximum Current
-------- -------- ----------------- ------ ------- -------
INDLU2 SNANODE NET1.IBMLUA MODE1 8 0
Session ID LFSID State LU Type TP ID
---------- ----- -------- ------- -----
* No active sessions
In the example above, independent session type INDSESS1 has four
queued session requests. That means four TP processes have called the
MCAllocate or MCGetAllocate intrinsic, specifying INDSESS1 in the
SessionType
parameter. The session requests were queued to wait for
available active sessions.
No sessions of type INDSESS1 are active,because the configured number
of automatically activated sessions is 0, and no one has issued the
APPCCONTROL SESSIONS command to activate more sessions. After the
APPCCONTROL SESSIONS command is issued to activate more sessions,
the Current session limit in the APPCCONTROL STATUS display will be
equal to the Number of Active Sessions.
Activating Sessions
To activate sessions of type INDSESS1, you issue the APPCCONTROL
SESSIONS command to raise the session limit for that session type:
APPCCONTROL SESSIONS; STYPE=INDSESS1; LIMIT=5
When you issue the APPCCONTROL SESSIONS command to raise the
session limit to 5, five sessions of the specified session type are
activated. The maximum session limit configured through NMMGR is
still 8, so you cannot raise the session limit beyond 8 with the
APPCCONTROL SESSIONS command. Under Session Limits in the
APPCCONTROL STATUS display, the Maximum value is the configured