Installation guide

The following example shows that performance tests are run on the a

partition of /dev/rz0, and program output is logged to the diskx.out

ﬁle. The −S ﬂag causes sequential transfers for the best test results.

Testing is done over the default range of transfer sizes:

# diskx -f /dev/rz0a -o diskx.out -p -S

The following command runs the read test on all partitions of the speciﬁed

disks. The disk exerciser is invoked as three separate processes, which

generate extensive system I/O activity. The command shown in this

example can be used to test system stress:

# diskx -f /dev/rrz0 -r &; diskx -f /dev/rrz1 -r &; diskx -

f /dev/rrz2 -r &

F.1.7 Exercising a Tape Drive

Use the tapex command to exercise a tape drive. The tapex command

writes, reads, and validates random data on a tape device from the

beginning-of-tape (BOT) to the end-of-tape (EOT). The tapex command also

performs positioning tests for records and ﬁles, and tape transportability

tests. For more information, refer to the tapex

(8) reference page.

Some tapex ﬂags perform speciﬁc tests (for example, an end-of-media

(EOM) test). Other ﬂags modify the tests, for example, by enabling caching.

The tapex command has the following syntax:

tapex

[ ﬂags][parameters]

You can specify one or more of the ﬂags described in Table F–1. In addition

to ﬂags, you can also specify test parameters. You specify parameters on

the tapex command line or interactively with the −i ﬂag. If you do not

specify test parameters, default values are used.

To use a test parameter, specify the parameter name, a space, and the

number value. For example, you could specify the following parameter:

−min_rs 512

Note that you can use the following scaling factors:

• k or K (for kilobyte (1024 * n))

• b or B (for block (512 * n))

• m or M (for megabyte (1024 * 1024 * n))

For example, 10K would specify 10,240 bytes.

The following parameters can be used with all tests:

F–12 Using the System Exercise Tools