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1227625a SP |
1 | .\" Copyright (c) 1980, 1991, 1993 |
2 | .\" Regents of the University of California. | |
3 | .\" All rights reserved. | |
4 | .\" | |
5 | .\" Redistribution and use in source and binary forms, with or without | |
6 | .\" modification, are permitted provided that the following conditions | |
7 | .\" are met: | |
8 | .\" 1. Redistributions of source code must retain the above copyright | |
9 | .\" notice, this list of conditions and the following disclaimer. | |
10 | .\" 2. Redistributions in binary form must reproduce the above copyright | |
11 | .\" notice, this list of conditions and the following disclaimer in the | |
12 | .\" documentation and/or other materials provided with the distribution. | |
13 | .\" 3. All advertising materials mentioning features or use of this software | |
ddd2ef55 | 14 | .\" must display the following acknowledgement: |
1227625a SP |
15 | .\" This product includes software developed by the University of |
16 | .\" California, Berkeley and its contributors. | |
17 | .\" 4. Neither the name of the University nor the names of its contributors | |
18 | .\" may be used to endorse or promote products derived from this software | |
19 | .\" without specific prior written permission. | |
20 | .\" | |
21 | .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
22 | .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
23 | .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
24 | .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
25 | .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
26 | .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
27 | .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
28 | .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
29 | .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
30 | .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
31 | .\" SUCH DAMAGE. | |
32 | .\" | |
b82d31dc | 33 | .\" $Id: dump.8.in,v 1.34 2001/11/11 00:06:39 stelian Exp $ |
1227625a | 34 | .\" |
8d4197bb | 35 | .Dd __DATE__ |
1227625a | 36 | .Dt DUMP 8 |
df9ae507 | 37 | .Os "dump __VERSION__" |
1227625a SP |
38 | .Sh NAME |
39 | .Nm dump | |
ddd2ef55 | 40 | .Nd ext2 filesystem backup |
1227625a SP |
41 | .Sh SYNOPSIS |
42 | .Nm dump | |
e084ba00 | 43 | .Op Fl 0123456789ackMnqSu |
1227625a SP |
44 | .Op Fl B Ar records |
45 | .Op Fl b Ar blocksize | |
46 | .Op Fl d Ar density | |
6d732772 SP |
47 | .Op Fl e Ar inode numbers |
48 | .Op Fl E Ar file | |
1227625a | 49 | .Op Fl f Ar file |
0d7af9c5 | 50 | .Op Fl F Ar script |
1227625a | 51 | .Op Fl h Ar level |
b82d31dc | 52 | .Op Fl I Ar nr errors |
88ef261e | 53 | .Op Fl j Ar compression level |
b45f51d6 | 54 | .Op Fl L Ar label |
35b24fb7 | 55 | .Op Fl Q Ar file |
1227625a SP |
56 | .Op Fl s Ar feet |
57 | .Op Fl T Ar date | |
ce7243e0 | 58 | .Op Fl z Ar compression level |
a94ecd11 | 59 | .Ar files-to-dump |
1227625a SP |
60 | .Nm dump |
61 | .Op Fl W Li \&| Fl w | |
62 | .Pp | |
8d4197bb | 63 | .in |
1227625a SP |
64 | (The |
65 | .Bx 4.3 | |
ddd2ef55 | 66 | option syntax is implemented for backward compatibility but |
1227625a SP |
67 | is not documented here.) |
68 | .Sh DESCRIPTION | |
69 | .Nm Dump | |
70 | examines files | |
ddd2ef55 | 71 | on an ext2 filesystem |
1227625a SP |
72 | and determines which files |
73 | need to be backed up. These files | |
74 | are copied to the given disk, tape or other | |
75 | storage medium for safe keeping (see the | |
76 | .Fl f | |
77 | option below for doing remote backups). | |
78 | A dump that is larger than the output medium is broken into | |
79 | multiple volumes. | |
80 | On most media the size is determined by writing until an | |
4f4eee3d | 81 | end-of-media indication is returned. |
b45f51d6 | 82 | .Pp |
1227625a | 83 | On media that cannot reliably return an end-of-media indication |
4f4eee3d SP |
84 | (such as some cartridge tape drives), each volume is of a fixed size; |
85 | the actual size is determined by specifying cartridge media, or via the | |
86 | tape size, density and/or block count options below. | |
1227625a SP |
87 | By default, the same output file name is used for each volume |
88 | after prompting the operator to change media. | |
89 | .Pp | |
a94ecd11 | 90 | .Ar files-to-dump |
79e31865 | 91 | is either a mountpoint of a filesystem |
a94ecd11 SP |
92 | or a list of files and directories to be backed up as a subset of a |
93 | filesystem. | |
79e31865 SP |
94 | In the former case, either the path to a mounted filesystem |
95 | or the device of an unmounted filesystem can be used. | |
96 | In the latter case, certain restrictions are placed on the backup: | |
97 | .Fl u | |
a94ecd11 SP |
98 | is not allowed, the only dump level that is supported is |
99 | .Fl 0 | |
100 | and all the files and directories must reside on the same filesystem. | |
79e31865 | 101 | .Pp |
1227625a | 102 | The following options are supported by |
b45f51d6 | 103 | .Nm Ns : |
1227625a SP |
104 | .Bl -tag -width Ds |
105 | .It Fl 0\-9 | |
106 | Dump levels. | |
107 | A level 0, full backup, | |
108 | guarantees the entire file system is copied | |
109 | (but see also the | |
110 | .Fl h | |
111 | option below). | |
112 | A level number above 0, | |
113 | incremental backup, | |
ddd2ef55 SP |
114 | tells |
115 | .Nm dump | |
116 | to | |
1227625a | 117 | copy all files new or modified since the |
ae58c8da | 118 | last dump of a lower level. |
ddd2ef55 | 119 | The default level is 9. |
1227625a | 120 | .It Fl B Ar records |
aca7d867 | 121 | The number of 1 kB blocks per volume. |
4f4eee3d | 122 | This option overrides the end-of-media detection, and calculation |
e7850aac SP |
123 | of tape size based on length and density. If compression is on this |
124 | limits the size of the compressed output per volume. | |
b45f51d6 SP |
125 | .It Fl a |
126 | .Dq auto-size . | |
4f4eee3d SP |
127 | Bypass all tape length calculations, and write |
128 | until an end-of-media indication is returned. This works best | |
129 | for most modern tape drives, and is the default. | |
130 | Use of this option is particularly recommended when appending to an | |
131 | existing tape, or using a tape drive with hardware compression | |
132 | (where you can never be sure about the compression ratio). | |
1227625a SP |
133 | .It Fl b Ar blocksize |
134 | The number of kilobytes per dump record. | |
ddd2ef55 | 135 | Since the IO system slices all requests into chunks of MAXBSIZE |
aca7d867 | 136 | (typically 64kB), it is not possible to use a larger blocksize |
ddd2ef55 SP |
137 | without having problems later with |
138 | .Xr restore 8 . | |
139 | Therefore | |
140 | .Nm dump | |
141 | will constrain writes to MAXBSIZE. | |
65bceb9b | 142 | The default blocksize is 10. |
1227625a | 143 | .It Fl c |
b45f51d6 | 144 | Change the defaults for use with a cartridge tape drive, with a density |
4f4eee3d SP |
145 | of 8000 bpi, and a length of 1700 feet. Specifying a cartridge drive |
146 | overrides the end-of-media detection. | |
6d732772 | 147 | .It Fl e Ar inodes |
20c345aa | 148 | Exclude |
6d732772 SP |
149 | .Ar inodes |
150 | from the dump. The | |
151 | .Ar inodes | |
152 | parameter is a comma separated list of inode numbers (you can use | |
20c345aa SP |
153 | .Ar stat |
154 | to find the inode number for a file or directory). | |
6d732772 SP |
155 | .It Fl E Ar file |
156 | Read list of inodes to be excluded from the dump from the text file | |
157 | .Ar file . | |
158 | The file | |
159 | .Ar file | |
160 | should be an ordinary file containing inode numbers separated by | |
161 | newlines. | |
b45f51d6 SP |
162 | .It Fl h Ar level |
163 | Honor the user | |
164 | .Dq nodump | |
165 | flag | |
166 | .Dp Dv UF_NODUMP | |
167 | only for dumps at or above the given | |
168 | .Ar level . | |
169 | The default honor level is 1, | |
170 | so that incremental backups omit such files | |
171 | but full backups retain them. | |
1227625a SP |
172 | .It Fl d Ar density |
173 | Set tape density to | |
174 | .Ar density . | |
4f4eee3d SP |
175 | The default is 1600BPI. Specifying a tape density overrides the |
176 | end-of-media detection. | |
1227625a SP |
177 | .It Fl f Ar file |
178 | Write the backup to | |
179 | .Ar file ; | |
180 | .Ar file | |
181 | may be a special device file | |
182 | like | |
ddd2ef55 | 183 | .Pa /dev/st0 |
1227625a SP |
184 | (a tape drive), |
185 | .Pa /dev/rsd1c | |
b45f51d6 | 186 | (a floppy disk drive), |
1227625a SP |
187 | an ordinary file, |
188 | or | |
189 | .Ql Fl | |
190 | (the standard output). | |
191 | Multiple file names may be given as a single argument separated by commas. | |
192 | Each file will be used for one dump volume in the order listed; | |
193 | if the dump requires more volumes than the number of names given, | |
194 | the last file name will used for all remaining volumes after prompting | |
195 | for media changes. | |
196 | If the name of the file is of the form | |
ddd2ef55 | 197 | .Dq host:file |
1227625a | 198 | or |
ddd2ef55 | 199 | .Dq user@host:file |
b45f51d6 | 200 | .Nm |
1227625a SP |
201 | writes to the named file on the remote host using |
202 | .Xr rmt 8 . | |
b45f51d6 SP |
203 | The default path name of the remote |
204 | .Xr rmt 8 | |
205 | program is | |
206 | .\" rmt path, is the path on the remote host | |
207 | .Pa /etc/rmt ; | |
208 | this can be overridden by the environment variable | |
209 | .Ev RMT . | |
0d7af9c5 | 210 | .It Fl F Ar script |
365a7c7c SP |
211 | Run script at the end of each tape. The device name and the |
212 | current volume number are passed on the command line. | |
213 | The script must return 0 if | |
ae81b200 SP |
214 | .Nm |
215 | should continue without asking the user to change the tape, 1 if | |
216 | .Nm | |
c534413c | 217 | should continue but ask the user to change the tape. |
ae81b200 SP |
218 | Any other exit code will cause |
219 | .Nm | |
220 | to abort. | |
221 | For security reasons, | |
222 | .Nm | |
223 | reverts back to the real user ID and the real group ID before | |
224 | running the script. | |
b82d31dc SP |
225 | .It Fl I Ar nr errors |
226 | By default, | |
227 | .Nm | |
228 | will ignore the first 32 read errors on the file | |
229 | system before asking for operator intervention. You can change this | |
230 | using this flag to any value. This is useful when running | |
231 | .Nm | |
232 | on an active filesystem where read errors simply indicate an | |
233 | inconsistency between the mapping and dumping passes. | |
88ef261e SP |
234 | .It Fl j Ar compression level |
235 | Compress every block to be written on the tape using bzlib library. This | |
236 | option will work only when dumping to a file or pipe or, when dumping | |
237 | to a tape drive, if the tape drive is capable of writing variable | |
238 | length blocks. You will need at least the 0.4b24 version of restore in | |
239 | order to extract compressed tapes. Tapes written using compression will | |
240 | not be compatible with the BSD tape format. The (optional) parameter | |
241 | specifies the compression level bzlib will use. The default compression | |
242 | level is 2. | |
b45f51d6 SP |
243 | .It Fl k |
244 | Use Kerberos authentication to talk to remote tape servers. (Only | |
245 | available if this option was enabled when | |
246 | .Nm | |
247 | was compiled.) | |
248 | .It Fl L Ar label | |
249 | The user-supplied text string | |
250 | .Ar label | |
251 | is placed into the dump header, where tools like | |
252 | .Xr restore 8 | |
253 | and | |
254 | .Xr file 1 | |
255 | can access it. | |
256 | Note that this label is limited | |
257 | to be at most LBLSIZE (currently 16) characters, which must include | |
258 | the terminating | |
259 | .Ql \e0 . | |
dc7cb1e2 SP |
260 | .It Fl M |
261 | Enable the multi-volume feature. The name specified with | |
262 | .Fl f | |
263 | is treated as a prefix and | |
264 | .Nm | |
265 | writes in sequence to <prefix>001, <prefix>002 etc. This can be | |
266 | useful when dumping to files on an ext2 partition, in order to bypass | |
267 | the 2GB file size limitation. | |
1227625a SP |
268 | .It Fl n |
269 | Whenever | |
b45f51d6 | 270 | .Nm |
1227625a SP |
271 | requires operator attention, |
272 | notify all operators in the group | |
273 | .Dq operator | |
274 | by means similar to a | |
275 | .Xr wall 1 . | |
e084ba00 SP |
276 | .It Fl q |
277 | Make | |
278 | .Nm | |
279 | abort immediately whenever operator attention is required, | |
280 | without prompting in case of write errors, tape changes etc. | |
35b24fb7 SP |
281 | .It Fl Q Ar file |
282 | Enable the Quick File Access support. Tape positions for each | |
283 | inode are stored into the file | |
284 | .Ar file | |
285 | which is used by restore (if called with parameter Q and the filename) | |
286 | to directly position the tape at the file restore is currently working | |
287 | on. This saves hours when restoring single files from large backups, | |
288 | saves the tapes and the drive's head. | |
b8f7cbe6 SP |
289 | .Pp |
290 | It is recommended to set up the st driver to return logical tape | |
291 | positions rather than physical before calling dump/restore with | |
292 | parameter Q. Since not all tape devices support physical tape | |
293 | positions those tape devices return an error during dump/restore when | |
294 | the st driver is set to the default physical setting. | |
295 | Please see the st man page, option MTSETDRVBUFFER, or the mt man | |
296 | page, on how to set the driver to return logical tape positions. | |
297 | .Pp | |
298 | Before calling restore with parameter Q, always make sure the st | |
299 | driver is set to return the same type of tape position used during the | |
300 | call to dump. Otherwise restore may be confused. | |
1227625a | 301 | .It Fl s Ar feet |
4f4eee3d | 302 | Attempt to calculate the amount of tape needed at a particular density. |
1227625a | 303 | If this amount is exceeded, |
b45f51d6 | 304 | .Nm |
1227625a SP |
305 | prompts for a new tape. |
306 | It is recommended to be a bit conservative on this option. | |
4f4eee3d SP |
307 | The default tape length is 2300 feet. Specifying the tape size |
308 | overrides end-of-media detection. | |
1227625a | 309 | .ne 1i |
144a6db1 SP |
310 | .It Fl S |
311 | Size estimate. Determine the amount of space | |
312 | that is needed to perform the dump without | |
313 | actually doing it, and display the estimated | |
2e682895 | 314 | number of bytes it will take. This is useful |
144a6db1 SP |
315 | with incremental dumps to determine how many |
316 | volumes of media will be needed. | |
1227625a SP |
317 | .It Fl T Ar date |
318 | Use the specified date as the starting time for the dump | |
319 | instead of the time determined from looking in | |
8d4197bb | 320 | .Pa __DUMPDATES__ . |
ddd2ef55 SP |
321 | The format of |
322 | .Ar date | |
323 | is the same as that of | |
1227625a SP |
324 | .Xr ctime 3 . |
325 | This option is useful for automated dump scripts that wish to | |
326 | dump over a specific period of time. | |
327 | The | |
328 | .Fl T | |
329 | option is mutually exclusive from the | |
330 | .Fl u | |
331 | option. | |
332 | .It Fl u | |
333 | Update the file | |
8d4197bb | 334 | .Pa __DUMPDATES__ |
1227625a SP |
335 | after a successful dump. |
336 | The format of | |
8d4197bb | 337 | .Pa __DUMPDATES__ |
1227625a SP |
338 | is readable by people, consisting of one |
339 | free format record per line: | |
340 | filesystem name, | |
341 | increment level | |
342 | and | |
343 | .Xr ctime 3 | |
344 | format dump date. | |
345 | There may be only one entry per filesystem at each level. | |
346 | The file | |
8d4197bb | 347 | .Pa __DUMPDATES__ |
1227625a SP |
348 | may be edited to change any of the fields, |
349 | if necessary. | |
350 | .It Fl W | |
351 | .Nm Dump | |
352 | tells the operator what file systems need to be dumped. | |
353 | This information is gleaned from the files | |
8d4197bb | 354 | .Pa __DUMPDATES__ |
1227625a SP |
355 | and |
356 | .Pa /etc/fstab . | |
357 | The | |
358 | .Fl W | |
359 | option causes | |
b45f51d6 | 360 | .Nm |
51b01afe | 361 | to print out, for all file systems in |
8d4197bb | 362 | .Pa __DUMPDATES__ , |
51b01afe SP |
363 | and regognized file systems in |
364 | .Pa /etc/fstab . | |
1227625a | 365 | the most recent dump date and level, |
51b01afe | 366 | and highlights those that should be dumped. |
1227625a SP |
367 | If the |
368 | .Fl W | |
369 | option is set, all other options are ignored, and | |
b45f51d6 | 370 | .Nm |
1227625a SP |
371 | exits immediately. |
372 | .It Fl w | |
ddd2ef55 SP |
373 | Is like |
374 | .Fl W , | |
51b01afe SP |
375 | but prints only recognized filesystems in |
376 | .Pa /etc/fstab | |
377 | which need to be dumped. | |
ce7243e0 | 378 | .It Fl z Ar compression level |
52ed7d6e | 379 | Compress every block to be written on the tape using zlib library. This |
2b747532 SP |
380 | option will work only when dumping to a file or pipe or, when dumping |
381 | to a tape drive, if the tape drive is capable of writing variable | |
52ed7d6e SP |
382 | length blocks. You will need at least the 0.4b22 version of restore in |
383 | order to extract compressed tapes. Tapes written using compression will | |
ce7243e0 SP |
384 | not be compatible with the BSD tape format. The (optional) parameter |
385 | specifies the compression level zlib will use. The default compression | |
386 | level is 2. | |
1227625a SP |
387 | .El |
388 | .Pp | |
389 | .Nm Dump | |
390 | requires operator intervention on these conditions: | |
391 | end of tape, | |
392 | end of dump, | |
393 | tape write error, | |
394 | tape open error or | |
b82d31dc | 395 | disk read error (if there is more than a threshold of nr errors). |
1227625a SP |
396 | In addition to alerting all operators implied by the |
397 | .Fl n | |
398 | key, | |
b45f51d6 | 399 | .Nm |
1227625a SP |
400 | interacts with the operator on |
401 | .Em dump's | |
402 | control terminal at times when | |
b45f51d6 | 403 | .Nm |
1227625a SP |
404 | can no longer proceed, |
405 | or if something is grossly wrong. | |
406 | All questions | |
b45f51d6 | 407 | .Nm |
1227625a SP |
408 | poses |
409 | .Em must | |
410 | be answered by typing | |
411 | .Dq yes | |
412 | or | |
413 | .Dq no , | |
414 | appropriately. | |
415 | .Pp | |
416 | Since making a dump involves a lot of time and effort for full dumps, | |
b45f51d6 | 417 | .Nm |
1227625a SP |
418 | checkpoints itself at the start of each tape volume. |
419 | If writing that volume fails for some reason, | |
b45f51d6 | 420 | .Nm |
1227625a SP |
421 | will, |
422 | with operator permission, | |
423 | restart itself from the checkpoint | |
424 | after the old tape has been rewound and removed, | |
425 | and a new tape has been mounted. | |
426 | .Pp | |
427 | .Nm Dump | |
428 | tells the operator what is going on at periodic intervals, | |
429 | including usually low estimates of the number of blocks to write, | |
430 | the number of tapes it will take, the time to completion, and | |
431 | the time to the tape change. | |
432 | The output is verbose, | |
433 | so that others know that the terminal | |
434 | controlling | |
b45f51d6 | 435 | .Nm |
1227625a SP |
436 | is busy, |
437 | and will be for some time. | |
438 | .Pp | |
439 | In the event of a catastrophic disk event, the time required | |
440 | to restore all the necessary backup tapes or files to disk | |
441 | can be kept to a minimum by staggering the incremental dumps. | |
442 | An efficient method of staggering incremental dumps | |
443 | to minimize the number of tapes follows: | |
444 | .Bl -bullet -offset indent | |
445 | .It | |
446 | Always start with a level 0 backup, for example: | |
447 | .Bd -literal -offset indent | |
8d4197bb | 448 | /sbin/dump -0u -f /dev/st0 /usr/src |
1227625a SP |
449 | .Ed |
450 | .Pp | |
451 | This should be done at set intervals, say once a month or once every two months, | |
452 | and on a set of fresh tapes that is saved forever. | |
453 | .It | |
454 | After a level 0, dumps of active file | |
455 | systems are taken on a daily basis, | |
456 | using a modified Tower of Hanoi algorithm, | |
457 | with this sequence of dump levels: | |
458 | .Bd -literal -offset indent | |
459 | 3 2 5 4 7 6 9 8 9 9 ... | |
460 | .Ed | |
461 | .Pp | |
462 | For the daily dumps, it should be possible to use a fixed number of tapes | |
463 | for each day, used on a weekly basis. | |
464 | Each week, a level 1 dump is taken, and | |
465 | the daily Hanoi sequence repeats beginning with 3. | |
466 | For weekly dumps, another fixed set of tapes per dumped file system is | |
467 | used, also on a cyclical basis. | |
468 | .El | |
469 | .Pp | |
470 | After several months or so, the daily and weekly tapes should get | |
471 | rotated out of the dump cycle and fresh tapes brought in. | |
b45f51d6 SP |
472 | .Sh ENVIRONMENT |
473 | .Bl -tag -width Fl | |
474 | .It Ev TAPE | |
475 | If no -f option was specified, | |
476 | .Nm | |
477 | will use the device specified via | |
478 | .Ev TAPE | |
479 | as the dump device. | |
480 | .Ev TAPE | |
481 | may be of the form | |
482 | .Qq tapename , | |
483 | .Qq host:tapename , | |
484 | or | |
485 | .Qq user@host:tapename . | |
486 | .It Ev RMT | |
487 | The environment variable | |
488 | .Ev RMT | |
489 | will be used to determine the pathname of the remote | |
490 | .Xr rmt 8 | |
491 | program. | |
0c62667d SP |
492 | .It Ev RSH |
493 | .Nm Dump | |
494 | uses the contents of this variable to determine the name of the | |
495 | remote shell command to use when doing remote backups (rsh, ssh etc.). | |
496 | If this variable is not set, | |
497 | .Xr rcmd 3 | |
498 | will be used, but only root will be able to do remote backups. | |
7ae7e903 | 499 | .El |
1227625a | 500 | .Sh FILES |
8d4197bb | 501 | .Bl -tag -width __DUMPDATES__ -compact |
ddd2ef55 | 502 | .It Pa /dev/st0 |
1227625a | 503 | default tape unit to dump to |
8d4197bb | 504 | .It Pa __DUMPDATES__ |
1227625a SP |
505 | dump date records |
506 | .It Pa /etc/fstab | |
507 | dump table: file systems and frequency | |
508 | .It Pa /etc/group | |
509 | to find group | |
510 | .Em operator | |
511 | .El | |
512 | .Sh SEE ALSO | |
b45f51d6 | 513 | .Xr fstab 5 , |
1227625a | 514 | .Xr restore 8 , |
b45f51d6 | 515 | .Xr rmt 8 |
1227625a SP |
516 | .Sh DIAGNOSTICS |
517 | Many, and verbose. | |
518 | .Pp | |
ddd2ef55 SP |
519 | .Nm Dump |
520 | exits with zero status on success. | |
1227625a SP |
521 | Startup errors are indicated with an exit code of 1; |
522 | abnormal termination is indicated with an exit code of 3. | |
523 | .Sh BUGS | |
ddd2ef55 SP |
524 | It might be considered a bug that this version of dump can only handle ext2 |
525 | filesystems. Specifically, it does not work with FAT filesystems. | |
526 | .Pp | |
b82d31dc SP |
527 | Fewer than 32 read errors (change this with -I) |
528 | on the filesystem are ignored. If noticing | |
ddd2ef55 SP |
529 | read errors is important, the output from dump can be parsed to look for lines |
530 | that contain the text 'read error'. | |
1227625a SP |
531 | .Pp |
532 | Each reel requires a new process, so parent processes for | |
533 | reels already written just hang around until the entire tape | |
534 | is written. | |
535 | .Pp | |
e7850aac SP |
536 | The estimated number of tapes is not correct if compression is on. |
537 | .Pp | |
1227625a | 538 | It would be nice if |
b45f51d6 | 539 | .Nm |
1227625a SP |
540 | knew about the dump sequence, |
541 | kept track of the tapes scribbled on, | |
542 | told the operator which tape to mount when, | |
543 | and provided more assistance | |
544 | for the operator running | |
545 | .Xr restore . | |
b45f51d6 SP |
546 | .Pp |
547 | .Nm Dump | |
548 | cannot do remote backups without being run as root, due to its | |
0c62667d | 549 | security history. |
b45f51d6 | 550 | Presently, it works if you set it setuid (like it used to be), but this |
0c62667d SP |
551 | might constitute a security risk. Note that you can set RSH to use |
552 | a remote shell program instead. | |
8d4197bb SP |
553 | .Sh AUTHOR |
554 | The | |
555 | .Nm dump/restore | |
7422942f | 556 | backup suite was ported to Linux's Second Extended File System |
8d4197bb SP |
557 | by Remy Card <card@Linux.EU.Org>. He maintained the initial versions |
558 | of dump (up and including 0.4b4, released in january 1997). | |
559 | .Pp | |
560 | Starting with 0.4b5, the new maintainer is Stelian Pop | |
561 | .br | |
109e9e1d | 562 | <pop@noos.fr>. |
8d4197bb SP |
563 | .Sh AVAILABILITY |
564 | The | |
565 | .Nm dump/restore | |
7422942f | 566 | backup suite is available from |
01fb6bd5 SP |
567 | .br |
568 | http://dump.sourceforge.net | |
1227625a SP |
569 | .Sh HISTORY |
570 | A | |
b45f51d6 SP |
571 | .Nm |
572 | command appeared in | |
573 | .At v6 . |