gtpn1m0pNon-SNA Data Communications Reference

Using the SLC Link Trace Package

To use the SLC link trace package, do the following:

  1. Initialize and mount the LKT tape.
  2. Issue the ZLKTN command to start the SLC link trace.
  3. Issue the ZLKTF command to stop the SLC link trace.
  4. Use the SLC link trace postprocessor to process the LKT tape.

After a Hardware Switchover

Always stop the SLC link trace before a hardware switchover. Before you can start the SLC link trace again, you must mount a new LKT tape.

After an Initial Program Load (IPL)

The TPF system stops the SLC link trace during an IPL, but the LKT tape remains open. To start the SLC link trace again, do the following:

  1. Leave the original LKT tape mounted.
  2. Enter the ZLKTN command to start the SLC link trace again.
    Note:
    The trace block before the IPL occurred is not written to the LKT tape. You can find this trace block in the catastrophic dump.
  3. Enter the ZLKTF command to stop the SLC link trace.
  4. Use the SLC link trace postprocessor to post-process the LKT tape.

After a Timer Alteration

If the basic subsystem (BSS) or time of day (TOD) clock is changed while you are using the SLC link trace, the trace records are not sorted correctly. Do the following to correct the sorting of the trace records:

  1. Enter the ZLKTF command to stop the SLC link trace.
  2. Enter the ZLKTN command to start the SLC link trace again. The correct sequence of traced link activity is restored.