Add the a' option (`auto-size'') to bypass all tape length
considerations, and dump right to the end of medium.
This commit is contained in:
Joerg Wunsch
parent
10c4031d64
commit
af00957e47
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=22192
@ -41,7 +41,7 @@
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.Nd filesystem backup
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.Sh SYNOPSIS
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.Nm dump
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.Op Cm 0123456789BbhfusTdWn Op Ar argument ...
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.Op Cm 0123456789BTWabcdfhnsu Op Ar argument ...
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.Op Ar filesystem
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.Sh DESCRIPTION
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.Nm Dump
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@ -56,7 +56,11 @@ option below for doing remote backups).
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A dump that is larger than the output medium is broken into
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multiple volumes.
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On most media the size is determined by writing until an
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end-of-media indication is returned.
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end-of-media indication is returned. This can be enforced
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by using the
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.Cm a
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option.
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.Pp
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On media that cannot reliably return an end-of-media indication
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(such as some cartridge tape drives)
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each volume is of a fixed size;
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@ -85,8 +89,19 @@ level is 9.
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The number of dump records per volume.
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This option overrides the calculation of tape size
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based on length and density.
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.It Cm a
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.Dq auto-size .
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Bypass all tape length considerations, and enforce writing
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until an end-of-media indication is returned. This fits best
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for most modern tape drives. Use of this option is particularly
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recommended when appending to an existing tape, or using a tape
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drive with hardware compression (where you can never be sure about
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the compression ratio).
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.It Cm b Ar blocksize
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The number of kilobytes per dump record.
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.It Cm c
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Change the defaults for use with a cartridge tape drive, with a density
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of 8000 bpi, and a length of 1700 feet.
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.It Cm h Ar level
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Honor the user
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.Dq nodump
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@ -325,10 +340,12 @@ Each reel requires a new process, so parent processes for
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reels already written just hang around until the entire tape
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is written.
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.Pp
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restore(8) is currently unable to restore dumps that were created
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with a blocksize larger than 32 on some tape drives. This is likely
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a bug in the tape driver. Workaround for safety reasons:
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dump aborts with an error message when choosing a blocksize > 32.
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Currently,
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.Xr physio 9
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slices all requests into chunks of 64 KB. Therefore, it is
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impossible to use a larger tape blocksize, so
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.Nm dump
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will prevent this from happening.
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.Pp
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.Nm Dump
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with the
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@ -74,6 +74,7 @@ long tsize; /* tape size in 0.1" units */
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long asize; /* number of 0.1" units written on current tape */
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int etapes; /* estimated number of tapes */
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int nonodump; /* if set, do not honor UF_NODUMP user flags */
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int unlimited; /* if set, write to end of medium */
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int notify; /* notify operator flag */
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int blockswritten; /* number of blocks written on current tape */
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@ -168,11 +168,18 @@ main(argc, argv)
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case 'b': /* blocks per tape write */
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ntrec = numarg('b', "number of blocks per write",
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1L, 1000L, &argc, &argv);
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/* XXX restore is unable to restore dumps that
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were created with a blocksize larger than 32K.
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Possibly a bug in the scsi tape driver. */
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if ( ntrec > 32 ) {
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msg("please choose a blocksize <= 32\n");
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/*
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* XXX
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* physio(9) currently slices all requests to
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* 64 KB chunks. So now, if somebody entered
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* e.g. 96 KB block size here, he would effectively
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* yield one 64 KB and one 32 KB block, which
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* restore cannot handle.
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* Thus we currently enforce pyhsio(9)'s limit
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* here, too.
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*/
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if ( ntrec > 64 ) {
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msg("please choose a blocksize <= 64\n");
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exit(X_ABORT);
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}
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break;
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@ -186,6 +193,10 @@ main(argc, argv)
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cartridge = 1;
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break;
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case 'a': /* `auto-size', Write to EOM. */
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unlimited = 1;
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break;
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/* dump level */
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case '0': case '1': case '2': case '3': case '4':
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case '5': case '6': case '7': case '8': case '9':
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@ -235,7 +246,7 @@ main(argc, argv)
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if (blocksperfile)
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blocksperfile = blocksperfile / ntrec * ntrec; /* round down */
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else {
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else if (!unlimited) {
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/*
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* Determine how to default tape size and density
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*
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@ -361,7 +372,7 @@ main(argc, argv)
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anydirskipped = mapdirs(maxino, &tapesize);
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}
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if (pipeout) {
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if (pipeout || unlimited) {
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tapesize += 10; /* 10 trailer blocks */
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msg("estimated %ld tape blocks.\n", tapesize);
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} else {
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@ -138,7 +138,7 @@ alloctape()
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* repositioning after stopping, i.e, streaming mode, where the gap is
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* variable, 0.30" to 0.45". The gap is maximal when the tape stops.
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*/
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if (blocksperfile == 0)
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if (blocksperfile == 0 && !unlimited)
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tenths = writesize / density +
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(cartridge ? 16 : density == 625 ? 5 : 8);
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/*
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@ -302,7 +302,7 @@ flushtape()
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asize += tenths;
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blockswritten += ntrec;
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blocksthisvol += ntrec;
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if (!pipeout && (blocksperfile ?
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if (!pipeout && !unlimited && (blocksperfile ?
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(blocksthisvol >= blocksperfile) : (asize > tsize))) {
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close_rewind();
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startnewtape(0);
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