1DUMP(8) System Manager's Manual DUMP(8)
2
6 dump - incremental file system dump
7
9 dump [0123456789BchfusTdWwn [argument ...]] [filesystem]
10
12 Dump copies to magnetic tape all files changed after a certain date in
13 the filesystem.
14 The following options are supported by dump:
16 0-9 This number is the `dump level'. All files modified since the
18 last date stored in the file /etc/dumpdates for the same filesys‐
19 tem at lesser levels will be dumped. If no date is determined by
20 the level, the beginning of time is assumed; thus the option 0
21 causes the entire filesystem to be dumped.
22 B records
24 The number of dump records per volume. This option overrides the
25 calculation of tape size based on length and density.
26 c This option requires no further options. Used to specify that the
28 tape is a cartridge drive rather than a 9-track.
29 h level
31 Honor the user 'nodump' flags only for dumps at or above the given
32 level. The default honor level is 1, so that incremental backups
33 omit such files but full backups retain them.
34 f Place the dump on the next argument file instead of the tape. If
36 '-' is given then standard out (stdout) is written to.
37 u If the dump completes successfully, write the date of the begin‐
39 ning of the dump on file /etc/dumpdates. This file records a sep‐
40 arate date for each filesystem and each dump level. The format of
41 /etc/dumpdates is readable by people, consisting of one free for‐
42 mat record per line: filesystem name, increment level and ctime(3)
43 format dump date. /etc/dumpdates may be edited to change any of
44 the fields, if necessary. Note that /etc/dumpdates is in a format
45 different from that which previous versions of dump maintained in
46 /etc/ddate, although the information content is identical.
47 s The size of the dump tape is specified in feet. The number of
49 feet is taken from the next argument. When the specified size is
50 reached, dump will wait for reels to be changed. The default tape
51 size is 2300 feet.
52 d The density of the tape, expressed in BPI, is taken from the next
54 argument. This is used in calculating the amount of tape used per
55 reel. The default is 1600.
56 T date
58 Use the specified date as the starting time for the dump instead
59 of the time determined from looking in /etc/dumpdates. The format
60 of date is the same as that of ctime(3). This option is useful
61 for automated dump scripts that wish to dump over a specific
62 period of time. The T option is mutually exclusive with the u
63 option.
64 W Dump tells the operator what file systems need to be dumped. This
66 information is gleaned from the files