Date: Fri, 16 Oct 2009 23:45:53 +0200 From: Stevan Tiefert <stevan-tiefert@kabelmail.de> To: Jerry McAllister <jerrymc@msu.edu> Cc: freebsd-questions@freebsd.org Subject: Re: small question about tape-based dumps Message-ID: <1255729553.4640.6.camel@x1-6-00-11-09-00-e4-00.search.b.superkabel.de> In-Reply-To: <20091016213732.GA61433@gizmo.acns.msu.edu> References: <1255727601.4640.4.camel@x1-6-00-11-09-00-e4-00.search.b.superkabel.de> <20091016213732.GA61433@gizmo.acns.msu.edu>
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Am Freitag, den 16.10.2009, 17:37 -0400 schrieb Jerry McAllister: > On Fri, Oct 16, 2009 at 11:13:21PM +0200, Stevan Tiefert wrote: > > > Hello list, > > > > one example: If I have three partitions and I want to backup every day > > these partitions, will I need 21 tapes? > > > > I ask because it seems it is not possible to place more than one dump on > > one tape, isn't it? > > You can easily put more than one dump on a tape if there is > room enough for them. Check out the mt(1) command. > > Something like mt fsf 1 will skip over the first dump file > so you can write the second. mt fsf 2 will skip over two files, etc. > That is dump files, not files within the dump. Each dump of a > filesystem is one file. > > If you need to restore, it is just the same. The first dump is > the first file. The second dump is reached by skipping 1 file > with the mt command, etc. > > I actually rewind and skip between each dump of multiples made > to the same tape. I also use the no-rewind device for the tape. > > So first dump is: dump 0af /dev/nsa0 / > > For second dump: mt -f /dev/nsa0 rewind > mt -f /dev/nsa0 fsf 1 > dump 0af /dev/nsa0 /usr > > third mt -f /dev/nsa0 rewind > mt -f /dev/nsa0 fsf 2 > dump 0af /dev/nsa0 /var > > etc. > > when all done mt -f /dev/nsa0 rewind > mt -f /dev/nsa0 offline > > I have this all in a script that also writes an index file > as the first file on the tape. > > Of course if you are doing a change dump the dump command is > going to look more like: > > dump 1af /dev/nsa0 > etc. > > ////jerry > > > > > With regards > > Stevan Tiefert > > > > > > > > _______________________________________________ > > freebsd-questions@freebsd.org mailing list > > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > > To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org" > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org" > Hello Jerry, The world can be so easy!!! Thanks for this hint :-) With regards Stevan Tiefert
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