What size and density parameters should I use for ufsdump with a high-capacity tape drive?
The only purpose of the ufsdump size and density parameters is to let dump
calculate the capacity of each tape and then decide for itself when it
needs a new tape. If the filesystem you are dumping is larger than the
tape, you will need to use more than one tape. But ufsdump can detect the
end of media for all modern tape drives, and will automatically prompt for
new tapes when needed, so as long as the size and density parameters
indicate a tape as long as or longer than the one you're using, ufsdump
will behave properly.
Thanks to Niall O Broin
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