Exchange/SNA Manual

TRACE Command
Exchange/SNA Commands
104700 Tandem Computers Incorporated 3–69
TRACE Command The TRACE command starts and stops the Exchange/SNA trace server, which logs the
activity on the data communications line.
T[RACE] { TO { trace-file | *} [ parameter ]... | ST[OP] }
TO trace-file
specifies the name of the file where you want to log the line activity. If the file
does not exist, one is created with a file code of 904. If the file already exists, it is
purged and a new one is created.
If you omit the volume name, your current default volume is used. If you omit
both the volume and subvolume names, your current default volume and
subvolume are used.
TO *
creates a unique trace file ZZEX nnnn each time a new trace is started using
TRACE TO *. The file code is 904, and the file is created in the current default
volume and subvolume. nnnn is a four-digit number that is automatically
incremented for each new file. This parameter is useful for command files when
you don’t want to purge the old trace file.
parameter
is one of the following terms:
BL[OCKS] maximum
specifies the maximum number of blocks that the trace file is to hold at once.
After the maximum number of blocks has been written to the trace file, the
writing of blocks continues from the beginning of the file again. The oldest
blocks are replaced by the most recent blocks. After the first cycle (the trace
file has filled up once), the trace file always contains maximum of the most
recent blocks.
If you omit this parameter, the maximum number of blocks is determined by
the size of the trace file. The writing of blocks cycles to the beginning of the
file when the end of the file is reached.
If you specify a maximum number of blocks that is larger than the number of
blocks the trace file can hold, the number you specify is ignored and the
maximum is determined by the size of the trace file.