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
parent
8fd0e941b9
commit
8378c4a9e1
@ -41,7 +41,7 @@
|
||||
.Nd filesystem backup
|
||||
.Sh SYNOPSIS
|
||||
.Nm dump
|
||||
.Op Cm 0123456789BbhfusTdWn Op Ar argument ...
|
||||
.Op Cm 0123456789BTWabcdfhnsu Op Ar argument ...
|
||||
.Op Ar filesystem
|
||||
.Sh DESCRIPTION
|
||||
.Nm Dump
|
||||
@ -56,7 +56,11 @@ option below for doing remote backups).
|
||||
A dump that is larger than the output medium is broken into
|
||||
multiple volumes.
|
||||
On most media the size is determined by writing until an
|
||||
end-of-media indication is returned.
|
||||
end-of-media indication is returned. This can be enforced
|
||||
by using the
|
||||
.Cm a
|
||||
option.
|
||||
.Pp
|
||||
On media that cannot reliably return an end-of-media indication
|
||||
(such as some cartridge tape drives)
|
||||
each volume is of a fixed size;
|
||||
@ -85,8 +89,19 @@ level is 9.
|
||||
The number of dump records per volume.
|
||||
This option overrides the calculation of tape size
|
||||
based on length and density.
|
||||
.It Cm a
|
||||
.Dq auto-size .
|
||||
Bypass all tape length considerations, and enforce writing
|
||||
until an end-of-media indication is returned. This fits best
|
||||
for most modern tape drives. Use of this option is particularly
|
||||
recommended when appending to an existing tape, or using a tape
|
||||
drive with hardware compression (where you can never be sure about
|
||||
the compression ratio).
|
||||
.It Cm b Ar blocksize
|
||||
The number of kilobytes per dump record.
|
||||
.It Cm c
|
||||
Change the defaults for use with a cartridge tape drive, with a density
|
||||
of 8000 bpi, and a length of 1700 feet.
|
||||
.It Cm h Ar level
|
||||
Honor the user
|
||||
.Dq nodump
|
||||
@ -325,10 +340,12 @@ Each reel requires a new process, so parent processes for
|
||||
reels already written just hang around until the entire tape
|
||||
is written.
|
||||
.Pp
|
||||
restore(8) is currently unable to restore dumps that were created
|
||||
with a blocksize larger than 32 on some tape drives. This is likely
|
||||
a bug in the tape driver. Workaround for safety reasons:
|
||||
dump aborts with an error message when choosing a blocksize > 32.
|
||||
Currently,
|
||||
.Xr physio 9
|
||||
slices all requests into chunks of 64 KB. Therefore, it is
|
||||
impossible to use a larger tape blocksize, so
|
||||
.Nm dump
|
||||
will prevent this from happening.
|
||||
.Pp
|
||||
.Nm Dump
|
||||
with the
|
||||
|
||||
@ -74,6 +74,7 @@ long tsize; /* tape size in 0.1" units */
|
||||
long asize; /* number of 0.1" units written on current tape */
|
||||
int etapes; /* estimated number of tapes */
|
||||
int nonodump; /* if set, do not honor UF_NODUMP user flags */
|
||||
int unlimited; /* if set, write to end of medium */
|
||||
|
||||
int notify; /* notify operator flag */
|
||||
int blockswritten; /* number of blocks written on current tape */
|
||||
|
||||
@ -168,11 +168,18 @@ main(argc, argv)
|
||||
case 'b': /* blocks per tape write */
|
||||
ntrec = numarg('b', "number of blocks per write",
|
||||
1L, 1000L, &argc, &argv);
|
||||
/* XXX restore is unable to restore dumps that
|
||||
were created with a blocksize larger than 32K.
|
||||
Possibly a bug in the scsi tape driver. */
|
||||
if ( ntrec > 32 ) {
|
||||
msg("please choose a blocksize <= 32\n");
|
||||
/*
|
||||
* XXX
|
||||
* physio(9) currently slices all requests to
|
||||
* 64 KB chunks. So now, if somebody entered
|
||||
* e.g. 96 KB block size here, he would effectively
|
||||
* yield one 64 KB and one 32 KB block, which
|
||||
* restore cannot handle.
|
||||
* Thus we currently enforce pyhsio(9)'s limit
|
||||
* here, too.
|
||||
*/
|
||||
if ( ntrec > 64 ) {
|
||||
msg("please choose a blocksize <= 64\n");
|
||||
exit(X_ABORT);
|
||||
}
|
||||
break;
|
||||
@ -186,6 +193,10 @@ main(argc, argv)
|
||||
cartridge = 1;
|
||||
break;
|
||||
|
||||
case 'a': /* `auto-size', Write to EOM. */
|
||||
unlimited = 1;
|
||||
break;
|
||||
|
||||
/* dump level */
|
||||
case '0': case '1': case '2': case '3': case '4':
|
||||
case '5': case '6': case '7': case '8': case '9':
|
||||
@ -235,7 +246,7 @@ main(argc, argv)
|
||||
|
||||
if (blocksperfile)
|
||||
blocksperfile = blocksperfile / ntrec * ntrec; /* round down */
|
||||
else {
|
||||
else if (!unlimited) {
|
||||
/*
|
||||
* Determine how to default tape size and density
|
||||
*
|
||||
@ -361,7 +372,7 @@ main(argc, argv)
|
||||
anydirskipped = mapdirs(maxino, &tapesize);
|
||||
}
|
||||
|
||||
if (pipeout) {
|
||||
if (pipeout || unlimited) {
|
||||
tapesize += 10; /* 10 trailer blocks */
|
||||
msg("estimated %ld tape blocks.\n", tapesize);
|
||||
} else {
|
||||
|
||||
@ -138,7 +138,7 @@ alloctape()
|
||||
* repositioning after stopping, i.e, streaming mode, where the gap is
|
||||
* variable, 0.30" to 0.45". The gap is maximal when the tape stops.
|
||||
*/
|
||||
if (blocksperfile == 0)
|
||||
if (blocksperfile == 0 && !unlimited)
|
||||
tenths = writesize / density +
|
||||
(cartridge ? 16 : density == 625 ? 5 : 8);
|
||||
/*
|
||||
@ -302,7 +302,7 @@ flushtape()
|
||||
asize += tenths;
|
||||
blockswritten += ntrec;
|
||||
blocksthisvol += ntrec;
|
||||
if (!pipeout && (blocksperfile ?
|
||||
if (!pipeout && !unlimited && (blocksperfile ?
|
||||
(blocksthisvol >= blocksperfile) : (asize > tsize))) {
|
||||
close_rewind();
|
||||
startnewtape(0);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user