Installation guide

−perf_max
Specifies the maximum transfer size to be
performed. If transfers are done using random
sizes, the sizes are within the range specified by the
−perf_min and −perf_max parameters. If fixed
size transfers are specified (see the −F flag),
transfers are done in a size specified by the
−perf_min parameter. This parameter can be used
with the −p test flag.
−perf_min
Specifies the minimum transfer size to be
performed. This parameter can be used with the −p
test flag.
−perf_splits
Specifies how the transfer size will change if you
test a range of transfer sizes. The range of transfer
sizes is divided by the number specified with the
−perf_splits parameter to obtain a transfer size
increment. For example, if the −perf_splits
parameter is set to 10, tests are run starting with
the minimum transfer size and increasing the
transfer size by 1/10th of the range of values for
each test repetition. The last transfer size is set to
the specified maximum transfer size. This
parameter can be used with the −p test flag.
−perf_xfers
Specifies the number of transfers to be performed in
performance analysis. If this value is not specified,
the number of transfers is set equal to the number
that is required to read the entire partition. This
parameter can be used with the −p test flag.
The following example performs read-only testing on the character device
special file that /dev/rrz0 represents. Because a partition is not specified,
the test reads from all partitions. The default range of transfer sizes is used.
Output from the exerciser program is displayed on the terminal screen:
# diskx -f /dev/rrz0 -r
The following example runs on the a partition of /dev/rz0, and program
output is logged to the diskx.out file. The program output level is set to
10 and causes additional output to be generated:
# diskx -f /dev/rz0a -o diskx.out -d -debug 10
Using the System Exercise Tools F–11