SNAX/HLS Configuration and Control Manual

Trace Analysis
Product Overview
1–12 104705 Tandem Computers Incorporated
Trace Analysis The SNAX/HLS Trace Analysis Program (HLSTAP) allows you to format and display
trace information in a meaningful, high-level format. Using HLSCOM, you can
configure four levels of tracing:
Verb input/output. This trace of all verb requests and replies helps you
troubleshoot application programs.
LU service calls. This traces all the calls SNAX/HLS makes to its LU Services
layer. LU services calls can be viewed as a trace of SNAX/HLS making verb
requests and dispatching the resulting operations from its execution queues.
Data flow control (DFC) layer. This traces the states of the DFC finite state
machines before and after a SNA request or response is processed by the DFC
layer.
SNALU I/O. This traces the flow of SNALU requests to and from the SNALU
interface.
Once a trace of selected LUs is complete, you stop the trace and begin analysis using
HLSTAP. HLSTAP allows you to select individual LUs or groups of LUs for
processing. Formatted displays decode all verb indicators, the session BIND, DFC
states, SNA request/response headers (RHs), and user data. HLSTAP also has several
convenience commands.
Note You must have internal knowledge of the SNAX/HLS server process to interpret the lower three levels of
the SNAX/HLS trace. Therefore, these layers are intended for use by technical support personnel.