Installation guide

The following example performs random record size tests and outputs
information in verbose mode. This test runs on the default tape device
/dev/rmt0h, and the output is sent to the terminal screen.
# tapex -g -v
The following example performs read and write record testing using record
sizes in the range 10K to 20K. This test runs on the default tape device
/dev/rmt0h, and the output is sent to the terminal screen.
# tapex -r -min_rs 10k -max_rs 20k
The following example performs a series of tests on tape device
/dev/rmt0h, which is treated as fixed block device in which record sizes
for tests are multiples of the blocking factor 512 KB. The append-to-media
test is not performed.
# tapex -f /dev/rmt0h -fixed 512 -no_overwrite
F.1.8 Exercising the Terminal Communication System
Use the cmx command to exercise the terminal communications system.
The cmx command writes, reads, and validates random data and packet
lengths on the specified communications lines.
The lines you exercise must have a loopback connector attached to the
distribution panel or the cable. Also, the line must be disabled in the
/etc/inittab file and in a nonmodem line; that is, the CLOCAL flag must
be set to on. Otherwise, the cmx command repeatedly displays error
messages on the terminal screen until its time expires or until you press
Ctrl/C. For more information, refer to the cmx
(8) reference page.
You cannot test pseudodevice lines or lta device lines. Pseudodevices have
p, q, r, s, t, u, v, w, x, y,orz as the first character after tty, for example,
ttyp3.
The cmx command has the following syntax:
/usr/field/cmx
[-h][-o file][-t min][-l line]
The cmx command flags are as follows:
−h
Prints a help message for the cmx command.
−o
file
Saves output diagnostics in file .
−t
min
Specifies how many minutes you want the cmx
command to exercise the communications system. If
Using the System Exercise Tools F–19