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Date: Fri, 30 Aug 2002 17:20:24 -0700
From: David Schultz <dschultz@uclink.Berkeley.EDU>
To: Kevin Oberman <oberman@es.net>
Cc: "Jack L. Stone" <jackstone@sage-one.net>,
	Brooks Davis <brooks@one-eyed-alien.net>,
	"David W. Chapman Jr." <dwcjr@inethouston.net>, stable@FreeBSD.ORG
Subject: Re: Updating world with least downtime
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Mail-Followup-To: Kevin Oberman <oberman@es.net>,
	"Jack L. Stone" <jackstone@sage-one.net>,
	Brooks Davis <brooks@one-eyed-alien.net>,
	"David W. Chapman Jr." <dwcjr@inethouston.net>, stable@FreeBSD.ORG
References: <3.0.5.32.20020830154031.020e3b90@mail.sage-one.net> <20020830211107.8251F5D06@ptavv.es.net>
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Thus spake Kevin Oberman <oberman@es.net>:
> For a modern system and a reasonable disk, this is trivial. I have a
> system which MUST not be down for over 15 minutes and I can do it
> quite easily unless I really fumble something in mergemaster. I do
> always merge a few files later and tend to install most changes very
> quickly, having ode the same upgrade on a non-critical system just
> before I do the critical one so I know what to expect.
> 
> The actual installworld time on my 1GHZ system is about 5 minutes
> (5:34 last time).

Nice record.  There ought to be a better solution than ``run
mergemaster really fast and hope nothing goes wrong,'' though.
For example, you could use mergemaster with -D on a copy of /etc
and commit the copy in single user mode.

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