Date: Sun, 10 Sep 2006 21:05:48 +0100 From: Alex Zbyslaw <xfb52@dial.pipex.com> To: Bob <bob@tania.servebbs.org> Cc: freebsd-questions@freebsd.org Subject: Re: SnapShot Magic Message-ID: <4504701C.6090104@dial.pipex.com> In-Reply-To: <200609101426.52892.bob@tania.servebbs.org> References: <200609101426.52892.bob@tania.servebbs.org>
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Bob wrote: >/usr is a 33GB HW/Raid partition, how can it possibly hold 6 33GB >snapshots??? > >If I mount each one of these, they all report to df that they are indeed 33BB >file systems! > >How is this magic achieved? > >Is there a doc somewhere with an explaination? > > Snapshots only hold the originals of blocks that have changed, but still look like a complete file system when you mount them. From man mount: > Further details can be found in the file at > /usr/src/sys/ufs/ffs/README.snapshot. > > which should have a pointer to the original paper. --Alex
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