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Full Discussion: UNIX Checking Tape Space
Operating Systems Solaris UNIX Checking Tape Space Post 302875891 by Corona688 on Wednesday 20th of November 2013 04:20:24 PM
Old 11-20-2013
Actually you're exactly right, but consider the implications.

An audio CD has tracks. You can command the CD player to jump to track 12 and it will do so, know how far it jumped, how much is left to play in that track, and where exactly the CD will end. It contains information on its contents... A cassette doesn't -- to find the end you have to listen to it. The 'end' might not even be silence, just old music you no longer care about, so you have to pay attention too.

Figuring this out is what a filesystem does for you and a tape doesn't. That often but not always becomes the tape application's job. It's also possible to just use a tape raw, with nothing but you keeping track of where its valid contents start and end.

By 'application', I'm asking exactly what you type or click to make a backup happen.
 

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LEARN ABOUT DEBIAN

btape

BTAPE(8)					     Network backup, recovery and verification						  BTAPE(8)

NAME

	btape - Bacula's Tape interface test program

SYNOPSIS

       btape [options] device-name

DESCRIPTION

       This manual page documents briefly the btape command.

OPTIONS

       A summary of options is included below.

       -?     Show summary of options and commands.

       -b bootstrap
	      Specify a bootstrap file.

       -c config
	      Specify configuration file.

       -d nn  Set debug level to nn.

       -p     Proceed inspite of I/O errors.

       -t     Open the default tape device.

       -s     No signals (for debugging).

       -v     Set verbose mode.

COMMANDS

       autochanger
	      test autochanger

       bsf    backspace file

       bsr    backspace record

       cap    list device capabilities

       clear  clear tape errors

       eod    go to end of Bacula data for append

       eom    go to the physical end of medium

       fill   fill tape, write onto second volume

       unfill read filled tape

       fsf    forward space a file

       fsr    forward space a record

       help   print this reference

       label  write a Bacula label to the tape

       load   load a tape

       quit   quit btape

       rawfill
	      use write() to fill tape

       readlabel
	      read and print the Bacula tape label

       rectest
	      test record handling functions

       rewind rewind the tape

       scan   read() tape block by block to EOT and report

       scanblocks
	      Bacula read block by block to EOT and report

       status print tape status

       test   General test Bacula tape functions

       weof   write an EOF on the tape

       wr     write a single Bacula block

       rr     read a single record

       rb     read a single bacula block

       qfill  quick fill command

SEE ALSO

       bscan(1), bextract(1).

AUTHOR

       This manual page was written by Jose Luis Tallon <jltallon@adv-solutions.net>.

Kern Sibbald							 26 November 2009							  BTAPE(8)
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