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DUMP(1M)										 DUMP(1M)

       dump - incremental file system dump

       dump [ key [ argument ... ] filesystem ]

       Dump  copies  to  magnetic  tape all files changed after a certain date in the filesystem.
       The key specifies the date and other options about the dump.  Key consists  of  characters
       from the set 0123456789fusd.

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

       u    If	the  dump  completes successfully, write the date of the beginning of the dump on
	    file `/etc/ddate'.	This file records a separate date for each  filesystem	and  each
	    dump level.

       0-9  This  number  is  the `dump level'.  All files modified since the last date stored in
	    the file `/etc/ddate' for the same filesystem at lesser levels will be dumped.  If no
	    date  is determined by the level, the beginning of time is assumed; thus the option 0
	    causes the entire filesystem to be dumped.

       s    The size of the dump tape is specified in feet.  The number of feet is taken from the
	    next  argument.   When the specified size is reached, the dump will wait for reels to
	    be changed.  The default size is 2300 feet.

       d    The density of the tape, expressed in BPI, is taken from the next argument.  This  is
	    used in calculating the amount of tape used per write. The default is 1600.

       If no arguments are given, the key is assumed to be 9u and a default file system is dumped
       to the default tape.

       Now a short suggestion on how perform dumps.  Start with a full level 0 dump

	    dump 0u

       Next, periodic level 9 dumps should be  made  on  an  exponential  progression  of  tapes.
       (Sometimes called Tower of Hanoi - 1 2 1 3 1 2 1 4 ...  tape 1 used every other time, tape
       2 used every fourth, tape 3 used every eighth, etc.)

	    dump 9u

       When the level 9 incremental approaches a full  tape  (about  78000  blocks  at	1600  BPI
       blocked 20), a level 1 dump should be made.

	    dump 1u

       After  this, the exponential series should progress as uninterrupted.  These level 9 dumps
       are based on the level 1 dump which is based on the level 0 full dump.	This  progression
       of levels of dump can be carried as far as desired.

       default filesystem and tape vary with installation.
       /etc/ddate: record dump dates of filesystem/level.

       restor(1), dump(5), dumpdir(1)

       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.

       Sizes are based on 1600 BPI blocked tape.  The raw  magtape  device  has  to  be  used  to
       approach these densities.  Read errors on the filesystem are ignored.  Write errors on the
       magtape are usually fatal.

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