An UNBIND request has been received for one of the LU-LU sessions between the VTAM® LU subtask, ISTPDCLU, and the NetView® program or NCCF LU, DSIAMLUT. There are two parallel LU-LU sessions. The PD TRACE session is used to transfer the contents of PIU trace buffers filled by VTAM. The session awareness session is used to transfer buffers containing session awareness data. This data is used by the NetView program or NLDM.
If PD TRACE is specified and the VTAM PIU trace buffers become full after the PD TRACE session has ended, PIU trace buffers will be re-used beginning with the buffer containing the oldest trace data. This overwriting will continue until the PD TRACE session is re-initiated. Thus, VTAM always maintains the PIUs most recently traced in its PIU trace buffers. The VTAM subtask ISTPDCLU waits for a new BIND request.
If SESSION AWARENESS is specified, VTAM frees the existing session awareness buffers. The NetView program or NLDM receives a refresh of all existing active sessions in the system when it requests the restart of session awareness tracing.
Consult the NetView or NLDM terminal operator to determine the cause of the UNBIND request. If further VTAM PIU tracing is desired, reactivate the PD TRACE session.
None.
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