On Mon, Mar 07, 2005 at 09:47:31AM -0500, Jerry McAllister wrote: > > > > Is there an easy way to combine a backup and verify when doing backups > > with dump? > > > > On Windows NT it's just a matter of checking a box. I seem to recall > > the last time I looked into this on UNIX there was no easy way to > > accomplish a verify operation for a backup, but perhaps things have > > changed with FreeBSD 5.3 (?). > > > > I've never had a problem with backup (I backup to DAT tape), but I'd > > feel better if every backup was followed by a verify to make sure the > > tape is readable. > > Actually, if used frequently for backups - such as every day, DAT is > notoriously prone to failure. So, it is a good idea to check dumps > made to DAT. Unfortunately, there is not a reasonable way to > automatically do it. There is a verify, but it cannot work on a > running system, because it compares files (inodes) on the tape back > to the ones on disk. Any changes mean an error, even if it was a > real change in the file between the time it was written and the > time it was read back. > > 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 not very familiar with tapes, but I think that the dump is written straight out to something like /dev/st0 right? So then wouldn't a second dump of the same snapshot diffed to the tape device be a good for a verify? Position tape at beginning of dump dump / | diff - /dev/st0 Though I don't have much experience with either dump or tapes to verify. > > ////jerry > > > > > -- > > Anthony > > > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "[EMAIL PROTECTED]" -- I sense much NT in you. NT leads to Bluescreen. Bluescreen leads to downtime. Downtime leads to suffering. NT is the path to the darkside. Powerful Unix is. Public Key: ftp://ftp.tallye.com/pub/lorenl_pubkey.asc Fingerprint: CEE1 AAE2 F66C 59B5 34CA C415 6D35 E847 0118 A3D2
pgphHnj25wEf4.pgp
Description: PGP signature