• Subject: Re: Checking tapes for "goodness"
  • From: "David Prowak" <prowakd@xxxxxxx>
  • Date: Fri, 30 Jan 1998 11:37:34 -0500

My earlier posting should have suggested CPYFRMTAP.
Sorry!

----------
> From: David Prowak <prowakd@EMI.COM>
> To: MIDRANGE-L@midrange.com
> Subject: Re: Checking tapes for "goodness"
> Date: Friday, January 30, 1998 8:17 AM
> 
> Walden,
>       Will CPYTOTAP do the job?
>       That is what has been recommended to me in the past.
>       It runs fairly quickly, and you can just delete the spool file when
done.
>       Would this do the sort of interrogation of the tape that your seeking?
> 
> Dave
> 
> 
> 
> 
> 
> ----------
> From: Walden Leverich <walden@techsoftinc.com>
> To: Midrange Mailing List <midrange-l@midrange.com>
> Subject: Checking tapes for "goodness"
> Date: Thursday, January 29, 1998 7:11 PM
> 
> All,
> 
> I recently received a set of tapes from a vendor and before I install the
> software on these tapes I would like to tape a pass over the tapes and
> check
> for any media errors. CHKTAP is useless as it does not actually look at
> _all_ the tape media, I believe the same can be said of DSPTAP, as it
only
> looks at the directory information.
> 
> Someone has just mentioned DUPTAP as a possibility sine this would have
to
> read the entire media in order to duplicate it, but errors in the
> bytestream
> would not be detected (or would they?) Bytestream errors are errors where
> the tape is still valid, but the data meaningless, for example when the
> tape
> should contain x'01234567890ABCDEF' and it does contain
x'FEDCBA0987654321'
> the restore process would kick this out as invalid (I hope) but DUPTAP
> would
> be more than willing to copy this bad string to another tape.
> 
> Anyway, how do others check the validity of media before starting
> installation processes? Or do you just cross your fingers and hope?
> 
> Thanks,
> -Walden
> 
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