vxdump(1M) (VXFS) vxdump(1M)
NAME
vxdump - incremental file system dump
SYNOPSIS
vxdump [options] filesystem
DESCRIPTION
vxdump backs up all files in filesystem, or files changed
after a certain date, to magnetic tape. options is a string
that specifies vxdump options, as shown below.
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 vxdump 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 byte 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
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vxdump(1M) (VXFS) vxdump(1M)
higher density is specified explicitly, vxdump 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 vxdump will
not be able to handle end-of-tape properly.
-f dump-file
Dump file. Dump to dump-file instead of to /dev/rmt8.
If dump-file is specified as -, dump to the standard
output.
-n Notify all operators in the operator group that vxdump
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, vxdump waits for you to
change the volume. vxdump 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:
tape 2300 feet
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 -f option.
-u Update the dump record. For each filesystem
successfully dumped, add an entry to the file
/etc/dumpdates that includes the filesystem name, date,
and dump level. This file can be edited by a privileged
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
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vxdump(1M) (VXFS) vxdump(1M)
options are ignored. After reporting, vxdump 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 wait until the entire tape is
written.
If you have the VxFS Advanced package, it is recommended that
dumps be done in multi-user mode with the online backup
facility. If you do not have the VxFS Advanced package, it is
recommended that incremental dumps be performed with the
system running in single-user mode.
FILES
/dev/rmt8 default unit to dump to
/etc/dumpdates dump date record
/etc/group to find group operator
/etc/hosts
REFERENCES
shutdown(1M), tar(1), vxrestore(1M_VXFS), wall(1M)
Copyright 1994 Novell, Inc. Page 3