Internal and external trace recording for the VIT

VTAM® can write the VIT trace data to an internal table or to an external device, such as a disk or tape.

You can use the MODE operand to choose internal or external trace recording. The MODE operand is available in both the TRACE start option and the MODIFY TRACE command.

Recording traces in an internal 64-bit common table
Recording traces in an external file

You can record data externally and internally at the same time. If it is necessary, you can have different sets of trace options active for each mode.

The default trace options (API, CIO, MSG, NRM, PIU, PSS, SMS, and SSCP) are always recorded internally; however, PSS and SMS can be turned off.