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merge(1,8)(8)                                                              merge(1,8)(8)



NAME
       merge(1,8) - merge(1,8) incremental dumps onto full dumps for restore




SYNOPSIS
       merge(1,8) <output file(1,n)> <full dump> <incremental dump>




DESCRIPTION
       merge(1,8) is a utility that allows one to apply incremental dumps to a full
       dump and produce a new full dump which reflects a later  state  of  the
       volume.  The new dump can then be used to restore the volume, or can be
       merged with other incrementals.

       An incremental or full dump reflects the state of  the  volume  at  the
       time(1,2,n)  it  was  dumped.  Full  dumps  can be restored so that a user may
       access(2,5) an older state of a volume. Incremental dumps do not necessarily
       have  sufficient  information  to  be  restored.  For instance, all the
       vnodes in(1,8) the dump may not be present. The  merging  process  allows  a
       full  image  of  a  state  that  was  only  incrementally  dumped to be
       restored.

       Currently incrementals apply to the last successful full dump that  was
       done.   As an example, say full dumps for a volume are done on Sundays,
       with incrementals being taken the rest of the week. If an administrator
       wishes  to restore a volume to Wednesdays state, he would have to fetch
       the full dumpfile from Sunday and the incremental dumpfile for  Wednes-
       day. Once these are present, the administrator would use the merge(1,8) pro-
       gram to create a new  updated  full  dump  for  Wednesdays  state,  and
       restore it to the server (using volutil(8) restore).

       Information in(1,8) the dump header is used to place a total ordering on the
       dumps. This way incrementals can only  be  applied  to  the  dump  with
       repect  to  which  they were taken. In addition, incrementals cannot be
       applied to other incrementals, and the dumps to  be  merged  must  have
       been  created  from  the  same volume replica. The merge(1,8) program checks
       these things, and reports failures if(3,n) they are violated.



SEE ALSO
       volutil (8), restore (1)



AUTHOR
       David C. Steere, 1991, created





                                                                      merge(1,8)(8)

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