ufsdump(1M) ufsdump(1M)
NAME
ufsdump - incremental file system dump
SYNOPSIS
/usr/sbin/ufsdump [options [arguments]] filesystem
DESCRIPTION
ufsdump backs up all files in filesystem, where filesystem
represents a special device, 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.
Options
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 \vel 0 dump copies the
entire file system 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.
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ufsdump(1M) ufsdump(1M)
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.
f dump-file
Dump file. Use dump-file as the file to dump to,
instead of /dev/rmt*. 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,
and as the number of 1024-byte blocks for diskettes.
The following are defaults:
cartridge
425 feet
diskette
1422 blocks (Corresponds to a 1.44 Mb
diskette, with one cylinder reserved for bad
block information.)
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 file system successfully
dumped that includes the file system name, date, and
dump level. This file can be edited by a privileged
user.
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ufsdump(1M) ufsdump(1M)
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. File systems that need
backing up are highlighted.
NOTICES
Fewer than 32 read errors on the file system 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/rmt* default unit to dump to
/etc/dumpdates dump date record
/etc/group to find group operator
/etc/hosts
REFERENCES
df(1M), shutdown(1M), tar(1), ufsrestore(1M), wall(1M)
Copyright 1994 Novell, Inc. Page 3