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From: gordon@sneaky.UUCP
Newsgroups: comp.unix.questions
Subject: Re: File system problems
Message-ID: <-64039391@sneaky>
Date: Fri, 31-Jul-87 20:21:00 EDT
Article-I.D.: sneaky.-64039391
Posted: Fri Jul 31 20:21:00 1987
Date-Received: Tue, 11-Aug-87 06:07:13 EDT
References: <8467@brl-adm.ARPA>
Lines: 26
Nf-ID: #R:brl-adm.ARPA:-846700:sneaky:-64039391:000:1168
Nf-From: sneaky.UUCP!gordon    Jul 31 19:21:00 1987


> /* Written  6:53 pm  Jul 25, 1987 by mind.UUCP!barry in sneaky:comp.unix.ques */
> In article <8467@brl-adm.ARPA> KFL@AI.AI.MIT.EDU (Keith F. Lynch) writes:
...
> >He has also said that after using doing a restore of a zero level dump,
> >it is necessary to immediately do another zero level dump or the file
> >system will get hosed again.  Is this really needed?  If so, can it be
> >done overnight, to /dev/null?
> 
> And even more garbage.
...

I'm not so sure this is pure garbage.  The 4.2/4.3 BSD restore program restores
files by going through the file system, not the disk device, and the inodes
of the files restored do not necessarily have the same numbers as they had
on the dump.  

If you don't do a full level zero dump, and later do an incremental dump,
and your file system gets trashed again (not because of not doing a level
zero dump, but because of Murphy's Law), and you try to restore the OLD
level zero dump and the NEW incremental on top of it, you will probably get 
garbage.  The first dump of the restored file system should be level 0.

				Gordon L. Burditt
				...!ihnp4!sys1!sneaky!gordon
				...!convex!infoswx!hal6000!sneaky!gordon