    DUMP(VIII)                   11/24/73                  DUMP(VIII)

    NAME
         dump - incremental file system dump

    SYNOPSIS
         dump [ key [ arguments ] filesystem ]

    DESCRIPTION
         Dump makes an incremental file system dump on magtape of all
         files changed after a certain date.  The key argument speci-
         fies  the  date  and other options about the dump.  Key con-
         sists of characters from the set abcfiu0hds.

         a    Normally files larger than 1000 blocks are  not  incre-
              mentally dump; this flag forces them to be dumped.

         b    The  next  argument  is taken to be the maximum size of
              the dump tape in blocks (see s).

         c    If the tape overflows, increment the last character  of
              its name and continue on that drive.  (Normally it asks
              you to change tapes.)

         f    Place the dump on the next argument file instead of the
              tape.

         i    the  dump  date  is  taken  from  the entry in the file
              /etc/dtab corresponding to the last time this file sys-
              tem was dumped with the -u option.

         u    the  date  just  prior  to  this  dump  is  written  on
              /etc/dtab upon  successful  completion  of  this  dump.
              This  file contains a date for every file system dumped
              with this option.

         0    the dump date is  taken  as  the  epoch  (beginning  of
              time).   Thus  this option causes an entire file system
              dump to be taken.

         h    the dump date is some number of hours before  the  cur-
              rent  date.  The number of hours is taken from the next
              argument in arguments.

         d    the dump date is some number of days before the current
              date.   The number of days is taken from the next argu-
              ment in arguments.

         s    the size of the dump tape is specified  in  feet.   The
              number of feet is taken from the next argument in argu-
              ments.  It is assumed that there are  9  standard  UNIX
              records  per foot.  When the specified size is reached,
              the dump will wait for reels to be  changed.   The  de-
              fault size is 2200 feet.

         If  no  arguments  are given, the key is assumed to be i and
         the file system is assumed to be /dev/rp0.

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    DUMP(VIII)                   11/24/73                  DUMP(VIII)

         Full dumps should be taken on quiet file systems as follows:

                 dump 0u /dev/rp0
                 ncheck /dev/rp0

         The ncheck will come in handy in case it is necessary to re-
         store individual files from this  dump.   Incremental  dumps
         should then be taken when desired by:

                 dump

         When  the  incremental  dumps get cumbersome, a new complete
         dump should be taken.  In this way, a restore requires load-
         ing  of the complete dump tape and only the latest incremen-
         tal tape.

    DIAGNOSTICS
         If the dump requires more than one tape, it will ask you  to
         change  tapes.   Reply  with  a  new-line when this has been
         done.  If the first block on the new tape is  not  writable,
         e.g.  because you forgot the write ring, you get a chance to
         fix it.  Generally, however, read or write failures are  fa-
         tal.

    FILES
         /dev/mt0        magtape
         /dev/rp0        default file system
         /etc/dtab

    SEE ALSO
         restor(VIII), ncheck(VIII), dump(V)

    BUGS

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