A wrap-around line trace exists for each channel. This trace is kept in a 4 KB buffer for each channel in the channel initiator address space. Trace is produced for each channel, so it is ideal for problems where a channel appears to be hung, because information can be collected about the activity of this channel long after the normal trace has wrapped.
The line trace is always active; you cannot turn it off. It is available for both LU 6.2 and TCP channels and should reduce the number of times a communications trace is required.
You can view the trace as unformatted trace that is written to CSQSNAP. You can display the trace by following these steps:
START TRACE(CHINIT) CLASS(4) IFCID(202)
DISPLAY CHSTATUS(channel) SAVEDThis dumps the current line for the selected channels to CSQSNAP. See Snap dumps for further information.
To obtain another dump of line trace data, you must stop and restart the current trace.
+ssid START TRACE(CHINIT) CLASS(4) IFCID(202) CSQW130I +ssid 'CHINIT' TRACE STARTED, ASSIGNED TRACE NUMBER 01
+ssid STOP TRACE(CHINIT) TNO(01)
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