Installation guide

−err_lines
Specifies the error printout limit.
−fixed
bs
Specifies a fixed block device. Record sizes for most
devices default to multiples of the blocking factor of
the fixed block device as specified by the
bs
argument.
The following parameters can be used with the −a flag, which measures
performance:
−perf_num
Specifies the number of records to write and read.
−perf_rs
Specifies the size of records.
Other parameters are restricted for use with specific tapex flags.
Option-specific parameters are documented in Table F–1.
Table F–1: The tapex Options and Option Parameters
tapex Flag Flag and Parameter Descriptions
−a
Specifies the performance measurement test, which calculates
the tape transfer bandwidth for writes and reads to the tape
by timing data transfers. The following parameters can be
used with the −a flag:
−perf_num
Specifies the number of records to
write and read.
−perf_rs
Specifies the size of records.
−b
Causes the write/read tests to run continuously until the
process is killed. This flag can be used with the −r and −g
flags.
−c
Enables caching on the device, if supported. This flag does
not specifically test caching; it enables the use of caching on a
tape device while other tests are running.
−C
Disables caching on TMSCP tape devices. If the tape device is
a TMSCP unit, then caching is the default mode of test
operation. This flag causes the tests to run in noncaching
mode.
Using the System Exercise Tools F–13