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more than one dump per tape

Posted on 2001-06-03
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How can i make more than one dump on a single tape? and then how to restore it with ufsrestore?
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Question by:azawawi
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jlevie earned 200 total points
ID: 6150223
To place more than one dump image on a tape you need to use a no-rewind tape device designated by appending "n" to the unit number, e.g., /dev/rmt/0n. Then later when you wish to restore from a dump image other than the first on the tape you use "mt -f /dev/rmt/0n fsf N" to position the tape at the beginning of the desired image where "N" is number of images to skip over. For example, to dump all of the file systems to one tape you could do something like:

# for f in / /var /export; do
> ufsdump 0uf /dev/rmt/0n $f
> done

To retrieve the contents of the dump of /var you'd do:

# mt -f /dev/rmt/0n rew
# mt -f /dev/rmt/0n fsf 1
# ufsrestore rf /dev/rmt/0n

If you are restoring all of the dump images in order using mt to positition the tape isn't necessary. When ufsrestore completes the tape will be positioned at the beginning of the next image.
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