ufsdump(1M) ufsdump(1M)
NAME
ufsdump - incremental file system dump
SYNOPSIS
ufsdump [options [ arguments ] ] filesystem
DESCRIPTION
ufsdump backs up all files in filesystem, or files changed after a
certain date, to magnetic tape; options is a string that specifies
ufsdump options, as shown below. Any arguments supplied for specific
options are given as subsequent words on the command line, in the
same order as that of the options listed.
If no options are given, the default is 9u.
The options are:
0-9 The dump level. All files in the filesystem that have been
modified since the last ufsdump at a lower dump level are
copied to the volume. For instance, if you did a level 2 dump
on Monday, followed by a level 4 dump on Tuesday, a subsequent
level 3 dump on Wednesday would contain all files modified or
added since the level 2 (Monday) backup. A level 0 dump copies
the entire filesystem to the dump volume.
b factor
Blocking factor. Specify the blocking factor for tape writes.
The default is 20 blocks per write. Note: the blocking factor
is specified in terms of 512 bytes blocks, for compatibility
with tar. The default blocking factor for tapes of density
6250BPI and greater is 64. The default blocking factor for
cartridge tapes (c option specified) is 126. The highest
blocking factor available with most tape drives is 126.
c Cartridge. Use a cartridge instead of the standard half-inch
reel. This sets the density to 1000BPI and the blocking factor
to 126. The length is set to 425 feet. This option is
incompatible with the d option, unless you specify a density of
1000BPI with that option.
d bpi Tape density. The density of the tape, expressed in BPI, is
taken from bpi. This is used to keep a running tab on the
amount of tape used per reel. The default density is 1600
except for cartridge tape. Unless a higher density is
specified explicitly, ufsdump uses its default density - even
if the tape drive is capable of higher-density operation (for
instance, 6250BPI). Note: the density specified should
correspond to the density of the tape device being used, or
ufsdump will not be able to handle end-of-tape properly.
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ufsdump(1M) ufsdump(1M)
f dump-file
Dump file. Use dump-file as the file to dump to, instead of
/dev/rmt/ctape1. If dump-file is specified as -, dump to the
standard output.
n Notify all operators in the operator group that ufsdump
requires attention by sending messages to their terminals, in a
manner similar to that used by the wall command.
s size
Specify the size of the volume being dumped to. When the
specified size is reached, ufsdump waits for you to change the
volume. ufsdump interprets the specified size as the length in
feet for tapes and cartridges. The following are defaults:
tape 2300 feet
cartridge 425 feet
t tracks
Specify the number of tracks for a cartridge tape. The default
is 9 tracks. The t option is not compatible with the D option.
u Update the dump record. Add an entry to the file
/etc/dumpdates, for each filesystem successfully dumped that
includes the filesystem name, date, and dump level. This file
can be edited by the super-user.
w List the file systems that need backing up. This information
is gleaned from the files /etc/dumpdates and /etc/vfstab. When
the w option is used, all other options are ignored. After
reporting, ufsdump exits immediately.
W Similar to the w option, except that the W option includes all
file systems that appear in /etc/dumpdates, along with
information about their most recent dump dates and levels.
Filesystems that need backing up are highlighted.
NOTES
Fewer than 32 read errors on the filesystem are ignored.
Each reel requires a new process, so parent processes for reels
already written just hang around until the entire tape is written.
It is recommended that incremental dumps also be performed with the
system running in single-user mode.
FILES
/dev/rmt8 default unit to dump to
/etc/dumpdates dump date record
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ufsdump(1M) ufsdump(1M)
/etc/group to find group operator
/etc/hosts
SEE ALSO
tar(1), wall(1), shutdown(1M), ufsrestore(1M).
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