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<HTML><HEAD><TITLE>TapeChanger::MTX - use 'mtx' to manipulate a tape library</TITLE><LINK REV="made" HREF="mailto:none"></HEAD><BODY><A NAME="__index__"></A><!-- INDEX BEGIN --><UL> <LI><A HREF="#name">NAME</A></LI> <LI><A HREF="#synopsis">SYNOPSIS</A></LI> <LI><A HREF="#description">DESCRIPTION</A></LI> <LI><A HREF="#variables">VARIABLES</A></LI> <LI><A HREF="#usage">USAGE</A></LI> <LI><A HREF="#notes">NOTES</A></LI> <LI><A HREF="#requirements">REQUIREMENTS</A></LI> <LI><A HREF="#todo">TODO</A></LI> <LI><A HREF="#see also">SEE ALSO</A></LI> <LI><A HREF="#author">AUTHOR</A></LI> <LI><A HREF="#copyright">COPYRIGHT</A></LI></UL><!-- INDEX END --><HR><P><H1><A NAME="name">NAME</A></H1><P>TapeChanger::MTX - use 'mtx' to manipulate a tape library</P><P><HR><H1><A NAME="synopsis">SYNOPSIS</A></H1><PRE> use TapeChanger::MTX;</PRE><PRE> my $loaded = TapeChanger::MTX->loadedtape; print "Currently loaded: $loaded\n" if ($loaded);</PRE><PRE> TapeChanger::MTX->loadtape('next'); my $nowloaded = TapeChanger::MTX->loadedtape; print "Currently loaded: $nowloaded\n" if ($nowloaded);</PRE><PRE>See below for more available functions.</PRE><P><HR><H1><A NAME="description">DESCRIPTION</A></H1><P>TapeChanger::MTX is a module to manipulate a tape library using the 'mtx' tape library program. It is meant to work with a simple shell/perl scriptto load and unload tapes as appropriate, and to provide a interface formore complicated programs to do the same. The below functions andvariables should do as good a job as explaining this as anything.</P><P><HR><H1><A NAME="variables">VARIABLES</A></H1><DL><DT><STRONG><A NAME="item_%24TapeChanger%3A%3AMTX%3A%3AMT_%3Ditem_%24TapeCha">$TapeChanger::MTX::MT=item $TapeChanger::MTX::MTX</A></STRONG><BR><DD>What is the location of the 'mt' and 'mtx' binaries? Can be set with'$MT' and '$MTX' in ~/.mtxrc, or defaults to '/usr/sbin/mt' and'/usr/local/sbin/mtx'.<P></P><DT><STRONG><A NAME="item_%24TapeChanger%3A%3AMTX%3A%3ADRIVE">$TapeChanger::MTX::DRIVE</A></STRONG><BR><DD><DT><STRONG><A NAME="item_%24TapeChanger%3A%3AMTX%3A%3ACONTROL">$TapeChanger::MTX::CONTROL</A></STRONG><BR><DD>What are the names of the tape (DRIVE) and changer (CONTROL) devicenodes? Can be set with $DRIVE or $CONTROL in ~/.mtxrc, or default to'/dev/rmt/0' and '/dev/changer' respectively.<P></P><DT><STRONG><A NAME="item_%24TapeChanger%3A%3AMTX%3A%3AEJECT">$TapeChanger::MTX::EJECT</A></STRONG><BR><DD>Does the tape drive have to eject the tape before the changer retrievesit? It's okay to say 'yes' if it's not necessary, in most cases. Can beset with $EJECT in ~/.mtxrc, or defaults to '1'.<P></P><DT><STRONG><A NAME="item_%24TapeChanger%3A%3AMTX%3A%3AREADY_TIME">$TapeChanger::MTX::READY_TIME</A></STRONG><BR><DD>How long should we wait to see if the drive is ready, in seconds, aftermounting a volume? Can be set with $READY_TIME in ~/.mtxrc, or defaultsto 60.<P></P><DT><STRONG><A NAME="item_%24TapeChanger%3A%3AMTX%3A%3ADEBUG">$TapeChanger::MTX::DEBUG</A></STRONG><BR><DD>Print debugging information? Set to '0' for normal verbosity, '1' fordebugging information, or '-1' for 'quiet mode' (be as quiet as possible).<P></P></DL><P><HR><H1><A NAME="usage">USAGE</A></H1><P>This module uses the following functions:</P><DL><DT><STRONG><A NAME="item_tape_cmd">tape_cmd ( COMMAND )</A></STRONG><BR><DD><DT><STRONG><A NAME="item_mt_cmd">mt_cmd ( COMMAND )</A></STRONG><BR><DD>Runs 'mtx' and 'mt' as appropriate. <CODE>COMMAND</CODE> is the command you'retrying to send to them. Uses 'warn()' to print the commands to the screenif $TapeChanger::MTX::DEBUG is set.<P></P><DT><STRONG><A NAME="item_numdrives">numdrives ()</A></STRONG><BR><DD><DT><STRONG><A NAME="item_numslots">numslots ()</A></STRONG><BR><DD><DT><STRONG><A NAME="item_loadedtape">loadedtape ()</A></STRONG><BR><DD>Returns the number of drives, number of slots, and currently loaded tapevalues, respectively, by parsing <STRONG>tape_cmd('status')</STRONG>.<P></P><DT><STRONG><A NAME="item_loadtape">loadtape ( SLOT [, DRIVE] )</A></STRONG><BR><DD>Loads a tape into the tape changer, and waits until the drive is againready to be written to. <CODE>SLOT</CODE> can be any of the following (with therelevant function indicated):<PRE> current C<loadedtape()> prev C<loadprevtape()> next C<loadnexttape()> first C<loadfirsttape()> last C<loadlasttape()> 0 C<_ejectdrive()> 1..99 Loads the specified tape number, ejecting whatever is currently in the drive.</PRE><P><CODE>DRIVE</CODE> is the drive to load, and defaults to 0. Returns 0 ifsuccessful, an error string otherwise.</P><P></P><DT><STRONG><A NAME="item_loadnexttape">loadnexttape ()</A></STRONG><BR><DD><DT><STRONG><A NAME="item_loadprevtape">loadprevtape ()</A></STRONG><BR><DD><DT><STRONG><A NAME="item_loadfirsttape">loadfirsttape ()</A></STRONG><BR><DD><DT><STRONG><A NAME="item_loadlasttape">loadlasttape ()</A></STRONG><BR><DD>Loads the next, previous, first, and last tapes in the changerrespectively. Use <STRONG>tape_cmd('next')</STRONG>, <STRONG>tape_cmd('previous')</STRONG>, <STRONG>tape_cmd('first')</STRONG>, and <STRONG>tape_cmd('last')</STRONG>, respectively.<P></P><DT><STRONG><A NAME="item_ejecttape">ejecttape ()</A></STRONG><BR><DD>Ejects the tape, by first ejecting the tape from the drive(<STRONG>mt_cmd(rewind)</STRONG> then <STRONG>mt_cmd(offline)</STRONG>) and then returning it to itsslot (<STRONG>tape_cmd(unload)</STRONG>). Returns 1 if successful, 0 otherwise.<P></P><DT><STRONG><A NAME="item_resetchanger">resetchanger ()</A></STRONG><BR><DD>Resets the changer, ejecting the tape and loading the first one from thechanger.<P></P><DT><STRONG><A NAME="item_checkdrive">checkdrive ()</A></STRONG><BR><DD>Checks to see if the drive is ready or not, by waiting for up to $TapeChanger::MTX::READY_TIME seconds to see if it can get statusinformation using <STRONG>mt_cmd(status)</STRONG>. Returns 1 if so, 0 otherwise.<P></P><DT><STRONG><A NAME="item_reportstatus">reportstatus</A></STRONG><BR><DD>Returns a string containing the loaded tape and the drive that it'smounted on.<P></P><DT><STRONG><A NAME="item_cannot_run">cannot_run ()</A></STRONG><BR><DD>Does some quick checks to see if you're actually capable of using thismodule, based on your user permissions. Returns a list of problems ifthere are any, 0 otherwise.<P></P></DL><P><HR><H1><A NAME="notes">NOTES</A></H1><P>~/.mtxrc is automatically loaded when this module is used, if it exists,using do(). This could cause security problems if you're trying to usethis with <CODE>setuid()</CODE> programs - so just don't do that. If you want someoneto have permission to mess with the tape drive and/or changer, let themhave that permission directly.</P><P><HR><H1><A NAME="requirements">REQUIREMENTS</A></H1><P>Perl 5.6.0 or better, an installed 'mtx' binary, and a tape changer andreader connected to the system.</P><P><HR><H1><A NAME="todo">TODO</A></H1><P>Support for Input/Export slots is not included, though it may be later.Possibly works for multiple drives per changer, but I haven't tested it,so I probably missed something. 'load previous' doesn't actually work,because mtx doesn't support it (though the help says it does).</P><P><HR><H1><A NAME="see also">SEE ALSO</A></H1><P><STRONG>mtx</STRONG>, <STRONG>mt</STRONG>, <STRONG>tapechanger</STRONG>. Inspired by <STRONG>stc-changer</STRONG>, which comeswith the AMANDA tape backup package (http://www.amanda.org), and MTX,available at <A HREF="http://mtx.sourceforge.net.">http://mtx.sourceforge.net.</A></P><P><HR><H1><A NAME="author">AUTHOR</A></H1><P>Tim Skirvin <<A HREF="mailto:tskirvin@uiuc.edu">tskirvin@uiuc.edu</A>></P><P><HR><H1><A NAME="copyright">COPYRIGHT</A></H1><P>Copyright 2001-2002 by the University of Illinois Board of Trustees and Tim Skirvin <<A HREF="mailto:tskirvin@ks.uiuc.edu">tskirvin@ks.uiuc.edu</A>>.</P></BODY></HTML>⌨️ 快捷键说明
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