dskx(8) System Manager's Manual dskx(8)
dskx - generic disk exerciser
/usr/field/dskx [ options ] -rdev
/usr/field/dskx [ options ] -pdevpart
/usr/field/dskx [ options ] -cdev
The exerciser tests the disk drives on your system. The exerciser has three main options which include read only, write/read/validate data
on a partition, and write/read/validate data of a disk.
The exerciser does random seeks and reads of random block sizes and random seeks, writes, reads, and validations of random data patterns of
random block sizes. The exerciser will run until or kill -15 pid is sent to the process.
A logfile is made in for you to examine and then remove. If there are errors in the logfile, make sure you check the file, because that is
where the driver and kernel error messages are saved.
CAUTION: Both the -c and -p options of the exerciser destroy data on the disk. Use extreme caution before using them on any non-scratch
media. If you are unsure of what data is on the disk, contact your system manager before running with either of these options.
One of the following function flags and arguments must be specified.
-rdev Performs a random read-only test on all partitions except the c partition. The dev argument can be a raw or buffered device name
and number. For example, rhp0, ra3, hk1.
-pdevpart Writes, reads, and validates data from the device name and number specified by dev and the partition specified by part. The dev
argument can be a raw or buffered device name and number. For example, rhp0, ra3, hk1. The part argument can be any valid par-
tition from a - h.
CAUTION: Be careful when exercising partitions that overlap other partitions, as you may inadvertently destroy data on a parti-
tion that you do not want to test. You can use the -q option of the command to see what partitions overlap on the device on your
-cdev Writes, reads, and validates data from all partitions except the c partition on the device specified by dev. The dev argument
can be a raw or buffered device name and number. For example, rhp0, ra3, hk1.
The options are:
-h Prints help message for the command.
-ofile Saves output diagnostics in file.
-tn Specifies the run time in minutes (n). The default is to run until the process receives a or kill -15 pid.
-dm Prints statistics every m minutes.
If there is a need to run a system exerciser over an NFS link or on a diskless system there are some restrictions. For exercisers that
need to write into a file system, such as the target file system must be writable by root. Also the directory, in which any of the exer-
cisers are executed, must be writable by root because temporary files are written into the current directory. These latter restrictions
are sometimes difficult to overcome because often NFS file systems are mounted in a way that prevents root from writing into them. Some of
the restrictions may be overcome by copying the exerciser to another directory and then executing it.
The following example exercises RA disk unit 1, for 60 minutes in the background:
% /usr/field/dskx -t60 -cra1 &
The following example exercises raw HP disk unit 0, partition d, until or kill -15 pid:
% /usr/field/dskx -prhp0d
Guide to System Exercisers