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From: ht@unisol.UUCP (Haral Tsitsivas)
Newsgroups: comp.unix.wizards
Subject: dump - Sun/BSD dump-level idiosyncracies?
Message-ID: <280@unisol.UUCP>
Date: Sat, 27-Jun-87 03:18:04 EDT
Article-I.D.: unisol.280
Posted: Sat Jun 27 03:18:04 1987
Date-Received: Sun, 28-Jun-87 02:31:44 EDT
References: <8034@brl-adm.ARPA>
Reply-To: haral@unisol.UUCP (Haral Tsitsivas)
Organization: UniSolutions Associates, Culver City, CA
Lines: 29


In article <8034@brl-adm.ARPA>  MANSFIEL%EMBL.BITNET@wiscvm.wisc.EDU (Niall 
>Mansfield) writes:
>Sun say that if you dump at e.g. level 4, you get all files
>which changed since the last level 0, 1, 2, or 3.  

The Sun documentations says the right thing (at least for BSD systems)...

>Now, Eric Foxley  (in his book "Unix for Super-Users") says
>that  you dump repeatedly at level 4 you would get

>1st dump:       C1
>2nd             C2
>3rd             C3
>4th             C4

>which seems a more truly "incremental" method.

If you really wanted to do what you say with your example you would do
dumps at successively higher levels (i.e. 4, 5, 6, 7, 8, 9).  

It doesn't really make sense to dump files not dumped since the last time
a dump of the same level was done...  That would place you in a position
of having to keep all your dump tapes (and restore from all of them if
you had to) and it would probably brake the logic of most dump schemes.
What would you do at level 0 (the full dump)?  Dump everything since
the last full dump?

--Haral Tsitsivas