gtpm1m43TPF V4R1 Migration Guide: 3.1 to 4.1

Systems Network Architecture (SNA) I/O Trace Facility

The Systems Network Architecture (SNA) input/output (I/O) trace facility is a new SNA communication trace facility that provides a detailed I/O trace for SNA I/O interrupts that occur during:

The SNA I/O trace facility also provides a detailed I/O trace for NCP, ALS, and CTC asynchronous interrupts. Normal data transfer operations and attention-only interrupts that occur during NCP and ALS data transfer operations are not traced.

When an I/O interrupt or an asynchronous interrupt occurs, the following data is stored in the SNA I/O trace table:

The SNA I/O trace facility is initially active for each device defined in the symbolic device address table (SDAT). The SDAT is part of the SNA keypoint that is defined by the CK2SN data macro. The SNA I/O trace facility can be turned on or turned off for a device by modifying the SNA I/O trace indicator bit in the SDAT.

To display the contents of the SNA I/O trace table online, enter the ZDDCA command using the XID dump tag. The SNA I/O trace table is also included in system error dumps that have the control program keyword (ICP) specified in the dump override table. See Controlling Dump Content for more information about dump keywords and the dump override table.

See the TPF ACF/SNA Data Communications Reference for for more information about the SNA I/O trace facility.