ufsdump(1M)       MISC. REFERENCE MANUAL PAGES        ufsdump(1M)



NAME
     ufsdump - incremental file system dump

SYNOPSIS
     ufsdump [options] 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.

     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 block-
          ing 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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     -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.

     -n   Notify all operators in the operator group that ufsdump
          requires  attention by sending messages to their termi-
          nals, in a manner similar to that used by the wall com-
          mand.

     -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:

               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 -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.



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     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
     /etc/group          to find group operator
     /etc/hosts

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












































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