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  3. May 2010

RE: Ultrium 4 Tape Initialization

No, as far as your backup is concerned CLEAR(*NO) does not "leave data" on
the tape.

Technical details: When you execute a DLTF does it leave the data on the
disk? Yes. But the file name is gone. It will eventually be written
over. Back on the S/36 there was on option on it's equivalent of DLTF
that would actually write binary zeros throughout all the space previously
consumed by the file. This is what CLEAR(*YES) is doing, writing binary
zeros throughout the entire tape. Useful for security purposes and to
really write on the tape to see if it may be "bad". But on a nightly
basis you do not need to run CLEAR(*YES). You will still have all the
tape space available if you run CLEAR(*NO). Basically it wiped out the
header and goes from there. Trust me, it just works. We've been doing
this for decades.


Rob Berendt

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