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mtx(8)									mtx(8)

Name
       mtx - generic magtape exerciser

Syntax
       /usr/field/mtx [ options ] -adev
       /usr/field/mtx [ options ] -sdev
       /usr/field/mtx [ options ] -ldev
       /usr/field/mtx [ options ] -vdev

Description
       The  exerciser will write, read, and validate random data on the speci‐
       fied magnetic tape device from beginning of tape (BOT) to end  of  tape
       (EOT).	There  are  four record length modes in which to run the exer‐
       ciser.  The modes are short (512 bytes), long (10240  bytes),  variable
       (512-20480 bytes), and all of these three in sequence.

       The exerciser will run until or a 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, check the file,  where  the  driver  and	kernel
       error messages are saved.

       An  enhanced  tape  exerciser  called  provides more comprehensive tape
       testing than this exerciser.  Refer to for a complete description.

Options
       The mtx options are:

       -h	 Print help message for the command.

       -ofile	 Save diagnostic output in file.

       -ti	 Run time in minutes (i).  The default is  to  run  until  the
		 process receives a or kill -15 pid.

       -rj	 Record	 length	 for  long-record  test.   May	range from 1 -
		 20480; the default is 10240 bytes.

       -fk	 Size of file in records.  The default is -1,  go  to  end-of-
		 tape.

Arguments
       You  must  specify one of the following function flags and its argument
       to the exerciser.

       -adev	 Perform short, long, and variable-length record tests on  the
		 dev,  a  raw  device  name  and  unit	number.	  For example,
		 -armt0h.

       -sdev	 Perform short (512-byte) record length test.  The  dev	 argu‐
		 ment  is  a  raw  device  name and unit number.  For example,
		 -srmt0h.

       -ldev	 Perform long (10240-byte) record length test.	The dev	 argu‐
		 ment  is  a  raw  device  name	 and unit number.  For example
		 -lrmt0h.

       -vdev	 Perform variable record length test (records  vary  from  512
		 bytes to 20480 bytes).	 The dev argument is a raw device name
		 and unit number.  For example, -vrmt0h.

Restrictions
       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 exercisers
       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 restrictions apply to the SCSI tape drives.  The Magnetic
       Tape Exerciser (MTX) runs the tape in start/stop	 mode;	that  is,  the
       tape  does not stream. Therefore, MTX should not run for extended peri‐
       ods of time (two hours maximum run time). In  addition,	MTX  does  not
       handle the end of tape properly.

Examples
       This example runs short, long, and variable-length tests on rmt0h until
       the process receives a or kill -15 pid:
       % /usr/field/mtx -armt0h
       The following example runs a long-record length test on rmt0h  for  240
       minutes in the background:
       % /usr/field/mtx -lrmt0h -t240 &

See Also
       tapex(8)
       Guide to System Exercisers

									mtx(8)
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