357 lines
12 KiB
Groff
357 lines
12 KiB
Groff
.\" Copyright (c) 1981, 1990, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)mt.1 8.1 (Berkeley) 6/6/93
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.\" $FreeBSD$
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.\"
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.Dd June 6, 1993
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.Dt MT 1
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.Os BSD 4
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.Sh NAME
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.Nm mt
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.Nd magnetic tape manipulating program
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.Sh SYNOPSIS
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.Nm
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.Op Fl f Ar tapename
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.Ar command
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.Op Ar count
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.Sh DESCRIPTION
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.Nm Mt
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is used to give commands to a magnetic tape drive.
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By default
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.Nm
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performs the requested operation once. Operations
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may be performed multiple times by specifying
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.Ar count .
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Note
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that
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.Ar tapename
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must reference a raw (not block) tape device.
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.Pp
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The available commands are listed below. Only as many
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characters as are required to uniquely identify a command
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need be specified.
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.Bl -tag -width "eof, weof"
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.It Cm weof
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Write
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.Ar count
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end-of-file marks at the current position on the tape.
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.It Cm smk
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Write
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.Ar count
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setmarks at the current position on the tape.
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.It Cm fsf
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Forward space
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.Ar count
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files.
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.It Cm fsr
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Forward space
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.Ar count
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records.
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.It Cm fss
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Forward space
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.Ar count
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setmarks.
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.It Cm bsf
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Backward space
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.Ar count
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files.
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.It Cm bsr
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Backward space
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.Ar count
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records.
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.It Cm bss
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Backward space
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.Ar count
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setmarks.
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.It Cm rdhpos
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Read Hardware block position.
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Some drives do not support this.
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The block
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number reported is specific for that hardware only.
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The count argument is
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ignored.
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.It Cm rdspos
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Read SCSI logical block position.
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Some drives do not support this.
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The
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count argument is ignored.
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.It Cm sethpos
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Set Hardware block position.
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Some drives do not support this.
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The count
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argument is interpreted as a hardware block to which to position the tape.
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.It Cm setspos
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Set SCSI logical block position.
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Some drives do not support this.
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The count
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argument is interpreted as a SCSI logical block to which to position the tape.
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.It Cm rewind
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Rewind the tape
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(Count is ignored).
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.It Cm offline , rewoffl
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Rewind the tape and place the tape unit off-line
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(Count is ignored).
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.It Cm erase
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Erase the tape.
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A count of 0 disables long erase, which is on by default.
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.It Cm retension
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Re-tension the tape
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(one full wind forth and back, Count is ignored).
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.It Cm status
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Print status information about the tape unit.
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For SCSI magnetic tape devices,
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the current operating modes of density, blocksize, and whether compression
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is enabled is reported.
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The current state of the driver (what it thinks that
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it is doing with the device) is reported.
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If the driver knows the relative
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position from BOT (in terms of filemarks and records), it prints that.
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Note
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that this information is not definitive (only BOT, End of Recorded Media, and
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hardware or SCSI logical block position (if the drive supports such) are
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considered definitive tape positions).
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.It Cm errstat
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Print (and clear) error status information about this device.
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For every normal
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operation (e.g., a read or a write) and every control operation (e.g,, a
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rewind), the driver stores up the last command executed and it's associated
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status and any residual counts (if any). This command retrieves and prints this
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information.
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If possible, this also clears any latched error information.
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.It Cm blocksize
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Set the block size for the tape unit. Zero means variable-length
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blocks.
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.It Cm density
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Set the density for the tape unit. For the density codes, see below.
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The density value could be given either numerically, or as a string,
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corresponding to the
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.Dq Reference
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field. If the string is abbreviated, it will be resolved in the order
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shown in the table, and the first matching entry will be used. If the
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given string and the resulting canonical density name do not match
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exactly, an informational message is printed about what the given
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string has been taken for.
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.It Cm geteotmodel
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Fetch and print out the current EOT filemark model.
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The model states how
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many filemarks will be written at close if a tape was being written.
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.It Cm seteotmodel
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Set (from the
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.Ar count
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argument)
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and print out the current and EOT filemark model.
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Typically this will be
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.Ar 2
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filemarks, but some devices (typically QIC cartridge drives) can
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only write
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.Ar 1
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filemark.
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Currently you can only choose a value of
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.Ar 1
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or
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.Ar 2 .
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.It Cm eom
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Forward space to end of recorded medium
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(Count is ignored).
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.It Cm eod
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Forward space to end of data, identical to
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.Cm eom .
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.It Cm comp
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Set compression mode.
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There are currently several possible values for the compression mode:
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.Pp
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.Bl -tag -width 123456789 -compact
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.It off
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Turn compression off.
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.It on
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Turn compression on.
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.It none
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Same as
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.Ar off .
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.It enable
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Same as
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.Ar on .
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.It IDRC
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IBM Improved Data Recording Capability compression (0x10).
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.It DCLZ
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DCLZ compression algorithm (0x20).
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.El
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.Pp
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In addition to the above recognized compression keywords, the user can
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supply a numeric compression algorithm for the tape drive to use. In most
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cases, simply turning the compression
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.Sq on
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will have the desired effect of enabling the default compression algorithm
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supported by the drive. If this is not the case (see the
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.Cm status
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display to see which compression algorithm is currently in use), the user
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can manually specify one of the supported compression keywords (above), or
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supply a numeric compression value.
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.El
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.Pp
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If a tape name is not specified, and the environment variable
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.Ev TAPE
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does not exist;
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.Nm
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uses the device
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.Pa /dev/nsa0 .
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.Pp
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.Nm Mt
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returns a 0 exit status when the operation(s) were successful,
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1 if the command was unrecognized, and 2 if an operation failed.
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.Pp
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The following density table was taken from the
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.Sq Historical sequential access density codes
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table (A-1) in Revision 11 of the SCSI-3 Stream Device Commands (SSC)
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working draft, dated November 11, 1997.
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.Pp
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The different density codes are as follows:
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.Pp
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.Dl 0x0 default for device
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.Dl 0xE reserved for ECMA
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.Bd -literal -offset 3n
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Value Width Tracks Density Code Type Reference Note
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mm in bpmm bpi
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0x01 12.7 (0.5) 9 32 (800) NRZI R X3.22-1983 2
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0x02 12.7 (0.5) 9 63 (1,600) PE R X3.39-1986 2
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0x03 12.7 (0.5) 9 246 (6,250) GCR R X3.54-1986 2
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0x05 6.3 (0.25) 4/9 315 (8,000) GCR C X3.136-1986 1
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0x06 12.7 (0.5) 9 126 (3,200) PE R X3.157-1987 2
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0x07 6.3 (0.25) 4 252 (6,400) IMFM C X3.116-1986 1
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0x08 3.81 (0.15) 4 315 (8,000) GCR CS X3.158-1987 1
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0x09 12.7 (0.5) 18 1,491 (37,871) GCR C X3.180 2
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0x0A 12.7 (0.5) 22 262 (6,667) MFM C X3B5/86-199 1
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0x0B 6.3 (0.25) 4 63 (1,600) PE C X3.56-1986 1
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0x0C 12.7 (0.5) 24 500 (12,690) GCR C HI-TC1 1,6
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0x0D 12.7 (0.5) 24 999 (25,380) GCR C HI-TC2 1,6
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0x0F 6.3 (0.25) 15 394 (10,000) GCR C QIC-120 1,6
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0x10 6.3 (0.25) 18 394 (10,000) GCR C QIC-150 1,6
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0x11 6.3 (0.25) 26 630 (16,000) GCR C QIC-320 1,6
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0x12 6.3 (0.25) 30 2,034 (51,667) RLL C QIC-1350 1,6
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0x13 3.81 (0.15) 1 2,400 (61,000) DDS CS X3B5/88-185A 5
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0x14 8.0 (0.315) 1 1,703 (43,245) RLL CS X3.202-1991 5
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0x15 8.0 (0.315) 1 1,789 (45,434) RLL CS ECMA TC17 5
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0x16 12.7 (0.5) 48 394 (10,000) MFM C X3.193-1990 1
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0x17 12.7 (0.5) 48 1,673 (42,500) MFM C X3B5/91-174 1
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0x18 12.7 (0.5) 112 1,673 (42,500) MFM C X3B5/92-50 1
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0x1C 6.3 (0.25) 34 1,654 (42,000) MFM C QIC-385M 1,6
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0x1D 6.3 (0.25) 32 1,512 (38,400) GCR C QIC-410M 1,6
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0x1E 6.3 (0.25) 30 1,385 (36,000) GCR C QIC-1000C 1,6
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0x1F 6.3 (0.25) 30 2,666 (67,733) RLL C QIC-2100C 1,6
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0x20 6.3 (0.25) 144 2,666 (67,733) RLL C QIC-6GB(M) 1,6
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0x21 6.3 (0.25) 144 2,666 (67,733) RLL C QIC-20GB(C) 1,6
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0x22 6.3 (0.25) 42 1,600 (40,640) GCR C QIC-2GB(C) ?
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0x23 6.3 (0.25) 38 2,666 (67,733) RLL C QIC-875M ?
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0x24 3.81 (0.15) 1 2,400 (61,000) CS DDS-2 5
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0x25 3.81 (0.15) 1 3,816 (97,000) CS DDS-3 5
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0x26 3.81 (0.15) 1 3,816 (97,000) CS DDS-4 5
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0x27 8.0 (0.315) 1 3,056 (77,611) RLL CS Mammoth 5
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0x28 12.7 (0.5) 36 1,491 (37,871) GCR C X3.224 1
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0x29 12.7 (0.5)
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0x2A
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0x2B 12.7 (0.5) 3 ? ? ? C X3.267 5
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.Ed
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.Bd -literal -offset 3n
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Code Description Type Description
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---------------- ----------------
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NRZI Non return to zero, change on ones R Reel-to-reel
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GCR Group code recording C Cartridge
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PE Phase encoded CS Cassette
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IMFM Inverted modified frequency modulation
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MFM Modified frequency modulation
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DDS DAT data storage
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RLL Run length limited
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.Ed
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.Bd -literal -offset 3n
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NOTES
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1. Serial recorded.
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2. Parallel recorded.
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3. Old format known as QIC-11.
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5. Helical scan.
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6. This is not an American National Standard. The reference is based on
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an industry standard definition of the media format.
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.Ed
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.Sh ENVIRONMENT
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If the following environment variable exists, it is utilized by
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.Nm .
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.Bl -tag -width Fl
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.It Ev TAPE
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.Nm Mt
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checks the
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.Ev TAPE
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environment variable if the
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argument
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.Ar tapename
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is not given.
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.Sh FILES
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.Bl -tag -width /dev/*rst[0-9]*xx -compact
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.It Pa /dev/*rwt*
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QIC-02/QIC-36 magnetic tape interface
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.It Pa /dev/*rsa[0-9]*
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SCSI magnetic tape interface
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.El
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.Sh SEE ALSO
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.Xr ast 4 ,
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.Xr dd 1 ,
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.Xr ioctl 2 ,
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.Xr mtio 4 ,
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.Xr sa 4 ,
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.Xr environ 7
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.Sh HISTORY
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The
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.Nm
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command appeared in
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.Bx 4.3 .
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.Pp
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Extensions regarding the
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.Xr st 4
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driver appeared in 386BSD 0.1 as a separate
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.Xr st 1
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command, and have been merged into the
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.Nm
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command in
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.Fx 2.1 .
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.Pp
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The former
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.Cm eof
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command that used to be a synonym for
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.Cm weof
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has been abandoned in
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.Fx 2.1
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since it was often confused with
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.Cm eom ,
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which is fairly dangerous.
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