Date: Sun, 10 Jun 2012 19:03:59 -0400 (EDT) From: Daniel Feenberg <feenberg@nber.org> To: "Ronald F. Guilmette" <rfg@tristatelogic.com> Cc: freebsd-questions@freebsd.org Subject: Re: Making a bootable backup (hard)disk... how? Message-ID: <Pine.GSO.4.64.1206101857470.6100@nber6> In-Reply-To: <48302.1339366497@tristatelogic.com> References: <48302.1339366497@tristatelogic.com>
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On Sun, 10 Jun 2012, Ronald F. Guilmette wrote: > > > What I don't understand (and what I wish someone would enlighten me about) > is just this: It would seem that in order to implement these dump levels, > dump must be keeping a record somewhere, for each file in the filesystem, > of the level at which that file was last dumped. But where is this infor- > mation stored, exactly?? I won't be able to sleep until I know. > Only the dates of the levels of backup are stored, in /etc/dumpdates. Then the fact that a file has been dumped is inferred by comparing the file's last mod date with the dates in /etc/dumpdates. See the -T and -u options of the dump man page where this is implied but perhaps not actually stated. It does occur to me that /etc is not a felicitous place to keep this information, but given the desirability of dumping filesystems in read only state, placing the dump dates in the filesystem itself isn't feasible. daniel feenberg
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