ufsdump(1M)                   UNIX System V(UFS)                    ufsdump(1M)


NAME
      ufsdump - incremental file system dump

SYNOPSIS
      /usr/sbin/ufsdump [options] 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.

      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.

     -f dump-file
             Dump file. Use dump-file as the file to dump to, instead of
             /dev/rmt8.  If dump-file is specified as -, dump to the standard
             output.


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     -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 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/dump           default unit to dump to
      /etc/dumpdates      dump date record
      /etc/group          to find group operator
      /etc/hosts





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SEE ALSO
      tar(1), wall(1), shutdown(1M), ufsrestore(1M).




















































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