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Date:      Sun, 23 Oct 2011 21:08:14 +0200
From:      Polytropon <freebsd@edvax.de>
To:        Bill Tillman <btillman99@yahoo.com>
Cc:        "freebsd-questions@freebsd.org" <freebsd-questions@freebsd.org>
Subject:   Re: Need to Backup Using Dump
Message-ID:  <20111023210814.698a51b6.freebsd@edvax.de>
In-Reply-To: <1319375054.79311.YahooMailNeo@web36507.mail.mud.yahoo.com>
References:  <000001cc90c0$a0c16050$e24420f0$@org> <4EA2CE72.5030202@cran.org.uk> <20111022161242.11803f76.freebsd@edvax.de> <4EA31702.7080406@locolomo.org> <1319375054.79311.YahooMailNeo@web36507.mail.mud.yahoo.com>

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On Sun, 23 Oct 2011 06:04:14 -0700 (PDT), Bill Tillman wrote:
> I have two FreeBSD 8.2-STABLE servers running NFS. I have
> tons of files on Server A that I want to backup to a big
> drive on Sever B. Server B nfs_mounts one of the filesystems
> on Server A to /mnt. So if I wanted to make a backup of
> the filesytem on Server A to Server B I tried:
> 
> dump -d /home/my_home/backups/20111024 /mnt
> 
> but each time I try this it tells me that filesystem /mnt
> is unknown. /mnt is not in /etc/fstab. I manually mounted
> this via NFS and that's where all the files I want to backup
> are accessible to the command line on Server B. What am I
> missing?

The dump + restore mechanism operates on device files
representing a file system, not a _mounted_ file system,
as source.

If, for example, your /home partition is /dev/ad0s1e, and
you've mounted the target at /mnt, then you could do:

	# cd /mnt
	# dump -0 -f - /dev/ad0s1e | restore -r -f -

Therefore /home has to be unmounted (or add flag -L to
dump from mounted file systems).

But note that this will dump the _complete_ file system's
content to /mnt as dump cannot be "more selective" here.



An alternative is to use rsync or cpdup where you can
explicitely address a subtree to be copied instead of
the whole file system.





-- 
Polytropon
Magdeburg, Germany
Happy FreeBSD user since 4.0
Andra moi ennepe, Mousa, ...



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