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From: jb3o+@andrew.cmu.edu (Jon Allen Boone)
Newsgroups: comp.unix.admin
Subject: Re: SUMMARY: Backup while in multi-user mode
Message-ID: <ocCh_9i00j5uA0xZMX@andrew.cmu.edu>
Date: 22 May 91 20:20:25 GMT
References: <1991May20.204327.17694@erg.sri.com> <690@silence.princeton.nj.us>
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	<43617@netnews.upenn.edu>,
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Organization: Carnegie Mellon, Pittsburgh, PA
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In-Reply-To: <VERBER.91May22112356@revere.mps.ohio-state.edu>

Ok, so I'll take the advice that you ought to do level 0 dumps in
single-user mode.

	    Question:

	    		Will the following scenario work?

	  2:00am (Dump Time!)
		 Cron on machine A (MA) says to do dumps.

		 Exebyte is on machine B (MB), so rsh the job to MB.

		 MB determines which filesystems need to be dumped at
		 what levels.  Let's say that there are 10 different
		 file systems.  Let's say that 1 needs a level 0 dump.
		 

		 machine C (MC) needs the level 0 dump.  Cron on MC
		 has a job scheduled which determines that it needs a
		 level 0 dump - so it shuts down.  Then, it dumps the
		 level 0 filesystem, rsh'ing the output to a dd
		 command on MB.  Once it's done, it reboots the
		 machine to multi-user mode. 

		 Well?  (Note: Comments about the insecurity of rsh,
		 etc. are welcome - but probably already known.)

If you can't do that, then WHAT can you do?

   IF you have many different file systems - too many to actually go
around and hang a unique exebyte off of each one - and you can't
realistically change the location of the exebyte each night, what do
you do other than multi-user mode backups (some of which are level 0)?

    Also, I just today did a multi-user backup/restore from one
machine to another - a level 0 dump of both / and /usr - restoring
each to another machine (with myself and another person logged in on
the dump machine) - and it seems to have worked just fine.


   -=> iain <=-

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