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Date:      Sat, 21 Nov 2009 08:14:15 -0800
From:      George Davidovich <freebsd@optimis.net>
To:        freebsd-questions@freebsd.org
Cc:        Bernt Hansson <bernt@bah.homeip.net>
Subject:   Re: Dump
Message-ID:  <20091121161415.GA68037@marvin.optimis.net>
In-Reply-To: <4B075AAA.80205@bah.homeip.net>
References:  <4B0562A4.5050405@bah.homeip.net> <4B056636.6050309@infracaninophile.co.uk> <4B075AAA.80205@bah.homeip.net>

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On Sat, Nov 21, 2009 at 04:12:42AM +0100, Bernt Hansson wrote:
> Matthew Seaman skrev:
> > Bernt Hansson wrote:
> > > 
> > > I've been testing backups with dump, works well BUT
> > > -L does not work. For example
> > > 
> > > dump -0 -a -u -L -f /mnt/dump.home.full /dev/ad0s2d
> > 
> > I believe that you need to tell dump the mount point of the file system in
> > order for it to create a snapshot, rather than the device file for the
> > partition. (ie. snapshotting only makes sense on a mounted read-write
> > filesystem).
> > 
> > Also, if you're dumping a snapshotted FS to a local file, then bump up the
> > cachesize to improve performance a lot.  Add '-C 32' to your command-line.
> 
> Ok. I've tested this
> dump -1 -a -u -L -C 64 -h 0 -f /usr/home/bernt/disk2/dump.backup.home.2 
> /usr/home
> dump -1 -a -u -L -C 64 -h 0 -f /usr/home/bernt/disk2/dump.backup.home.2 
> /usr/home
> 
> The error is
> mksnap_ffs: Cannot create /usr/home/.snap/dump_snapshot: Invalid argument
> dump: Cannot create /usr/home/.snap/dump_snapshot: No such file or directory

Aargh.  Must have missed the above when I last replied.  That error
message indicates you're running dump without proper privileges.

Run dump as root, or add yourself to the operator group:

  pw groupmod operator -m bernt 

-- 
George



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