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Path: utzoo!henry
From: henry@utzoo.UUCP (Henry Spencer)
Newsgroups: net.unix-wizards
Subject: Re: excessive resync errors from 4.2 restore
Message-ID: <5490@utzoo.UUCP>
Date: Mon, 15-Apr-85 13:01:05 EST
Article-I.D.: utzoo.5490
Posted: Mon Apr 15 13:01:05 1985
Date-Received: Mon, 15-Apr-85 13:01:05 EST
References: <9909@brl-tgr.ARPA>
Organization: U of Toronto Zoology
Lines: 16

>   Our monthly dumps of the user filesystem on an Eagle (~350 Mb) are
> running into 8 or 9 tapes.  Recently, we've been trying to restore(8)
> individual files from these dumps.  We are getting lots of 'resynch'
> error messages and are unable to restore several files.

Do you run your dumps while the system is active multi-user?  My
understanding is that 4.2 dump is better about this than the old Unix
dump, but it's probably less than perfect.  It is extremely hard to
build a dump program that will run perfectly when the file system
is changing underfoot, and I don't believe Berkeley tried.  Truly
reliable dumps require a quiescent file system, which in practice
means you'd better unmount it to make sure it's really idle.  This
generally means that you have to run your dumps single-user.
-- 
				Henry Spencer @ U of Toronto Zoology
				{allegra,ihnp4,linus,decvax}!utzoo!henry