Date: Mon, 7 Mar 2005 18:21:38 +0200 From: Giorgos Keramidas <keramida@ceid.upatras.gr> To: freebsd-questions@freebsd.org Subject: Re: What's the easiest way to do a backup and verify? Message-ID: <20050307162138.GA1307@orion.daedalusnetworks.priv> In-Reply-To: <1145660633.20050307160515@wanadoo.fr> References: <1946173739.20050307145644@wanadoo.fr> <200503071447.j27ElWW10343@clunix.cl.msu.edu> <1145660633.20050307160515@wanadoo.fr>
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On 2005-03-07 16:05, Anthony Atkielski <atkielski.anthony@wanadoo.fr> wrote: >Jerry McAllister writes: >> The only real thing you can do is to read back the tape and look for >> a couple of files with fairly high inode numbers for each file system >> dumped. If you can read them, you can assume the tape is readable. > > I'm surprised there isn't just some way of reading the tape and doing > a few simple sanity checks on the data (without comparing it to > anything). A drive or tape error would likely show on such checks. If cpio(1) and the 'crc' format has been used to create an archive on a tape, then cpio can verify that the files on the tape have the same checksum: cpio -i --only-verify-crc < /dev/st0 The restore(8) utility has a -N option that can be used to verify a backup after dump(8) has been used. - Giorgos
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