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Date:      Thu, 22 Jan 2015 09:38:12 -0800
From:      Chris Maness <chris@chrismaness.com>
To:        markham breitbach <markhamb@corp.ssimicro.com>
Cc:        "freebsd-questions@freebsd.org" <freebsd-questions@freebsd.org>
Subject:   Re: Dump/Restore for system migration
Message-ID:  <CANnsUMEBg4svfTOySaPEOweExQ9h-j6dWgyCiTiaBiuFO-X8uQ@mail.gmail.com>
In-Reply-To: <54C120E6.5090301@corp.ssimicro.com>
References:  <CANnsUMESEWsEXyyKwqyrnTMiEEYuExTgD0Z4NBuJF0cYSWDChQ@mail.gmail.com> <20150120010551.c17d9f50.freebsd@edvax.de> <54C120E6.5090301@corp.ssimicro.com>

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On Thu, Jan 22, 2015 at 8:10 AM, markham breitbach <
markhamb@corp.ssimicro.com> wrote:

>
> On 2015-01-19 5:05 PM, Polytropon wrote:
> >> Is there a better way to do this?
> > Usually not, because dump + restore is _the_ way to do it.
> > Except of course you're using ZFS. :-)
> I have often done system migrations using rsync over ssh something like
>
> rsync -aHv / root@targethost:/
>
> The great thing about rsync is that is will only transfer what it needs
> to, so the first run will take a while to get pretty much everything
> over.  I then run a second time with a --delete switch to catch anything
> that changed while the first run was going (A full sync of my mail store
> can take well over 24 hours!).  The second run will go much faster,
> depending on the size of the initial run.  Finally, I will mount RO, so
> I know nothing is changing and run a final sync, which usually only
> takes a couple of minutes, then light up the new system.
>
> If you already have a system dump/restore you could also just use rsync
> as the final step to catch the stragglers.
>
> -Markham
>
>
>

That actually sounds pretty good.  The target system has been running for a
few days source system powered off.  I am not sure if a rsync right now
would do more harm than good.  However, I do understand that rsync will
ignore files that have already changed.

I use rsync -vaur flags on most of my backups.

Thanks,
Chris



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