Date: Wed, 03 Jan 2001 21:33:53 -0500 From: mikel <mikel@ocsinternet.com> To: bdluevel@heitec.net Cc: questions@FreeBSD.ORG Subject: Re: a very dumb backup question Message-ID: <3A53E111.DBA74A4B@ocsinternet.com> References: <14931.48360.311640.703454@guru.mired.org> <3A53C78F.359C6A80@heitec.net>
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I've only encounter the 8mb ceiling when makeing files on the hd...i've never had the problem on tape. I also find it's easier to used different backup stages. Follow this link to a daemonnews article regarding multiple cuts on a tape...they discuss several methods. http://www.daemonnews.org/199902/answerman.html#backup There was another article that explained things a bit better but I can't find it right now...The jist is use /dev/rsa0 to rewind at the end of a tar; /dev/ersa0 to rewind and eject the tape; and finally /dev/nrsa0 for append backups where you don't want the tape rewound. For instance take the following: #!/bin/sh tar czpf /dev/nrsa0 /etc # (don't worry tar will strip the leading /) tar czpf /dev/nrsa0 /usr tar czpf /dev/ersa0 /web Cheers, Mikel bdluevel@heitec.net wrote: > Mike Meyer wrote: > [...] > > Final comment - I'd recommend dump instead of tar, especially for the > > root file system, because historically it's tracked changes to the > > file sysystem and special files better than tar. > > I've got an additional question concerning dump vs. tar: I seem to > remember that tar has an built-in limit of 8 GB per single backup, > because of some restriction in the tar file format. Is this true, and > what are the limits for dump and pax? And, given that backups sizes are > limited, how to best backup a 30 GB partition using 20 GB tapes? > Chunk-wise, with several 'tar' runs to the same tape without rewinding, > I assume? (Repartitioning into partitions with less than 8 GB each is > not an option in my situation, I'm afraid.) > > Is there a way to let 'dump' backup less than an entire partition, such > as a directory and all its subdirectories? > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-questions" in the body of the message To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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