Installation guide

with an r (for example, rz1). The last character of the file name can specify
the disk partition to test.
If a partition is not specified, all partitions are tested. For example, if the
devname variable is /dev/rra0, all partitions are tested. If the devname
variable is /dev/rra0a, the a partition is tested. This parameter must be
specified and can be used with all test flags.
The following flags specify the tests to be run on disk:
−d
Tests the disk’s disktab file entry. The disktab entry is
obtained by using the getdiskbyname library routine. This
test only works if the specified disk is a character special file.
See the disktab
(4) reference page for more information.
−h
Displays a help message describing test flags and parameters.
−p
Specifies a performance test. Read and write transfers are
timed to measure device throughput. Data validation is not
performed as part of this test. Testing uses a range of transfer
sizes if the −F flag is not specified.
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.
If you do not specify a number of transfers, the transfer count
is set to allow the entire partition to be read or written. In this
case, the transfer count varies, depending on the transfer size
and the partition size.
The performance test runs until completed or until
interrupted; the time is not limited by the −minutes
parameter. This test can take a long time to complete,
depending on the test parameters.
To achieve maximum throughput, specify the −S flag to cause
sequential transfers. If the −S flag is not specified, transfers
are done to random locations. This may slow down the
observed throughput because of associated head seeks on the
device.
Using the System Exercise Tools F–7