Hard to believe all the threads that my original posting has produced.
LOL! Sometimes you never know all the responses that will be generated.
But, now that we've been on this subject of DLT drives, and whether or
not they benefit from this media verification safety net option, or
whether it's moot, does anyone know the scoop on LTO? Do LTO drives have
this problem?

George

Steve Rader wrote:
>
>  > > DLT (and most all modern tape technologies, IIRC) do "read after
>  > > write", so DLT drives automatically verify that all the data they
>  > > receive is written to tape.  That leads me to think that auto media
>  > > verify is not necessary, at least when writing to DLT.
>  > >
>  > > So I'm still left wondering: is there some compelling reason
>  > > to set auto media verify?  (If the answer is yes, I would think
>  > > Legato would make it a default setting or at least mention it in
>  > > doc/release notes.)
>
>  > The question is, does DLT (or other technology) acknowledge the write
>  > before or after verifying the tape.  If it's before the verification,
>  > then a situation could arise where the verification fails and there is
>  > not enough tape left in the cartridge to rewrite the buffer.  I'll bet
>  > that is the case.
>
> ...doesn't this hypothesis imply that DLT drives are quite broken
> by design???
>
>  > My understanding is that DLT has a "warning" mark some distance from the
>  > end (EOT vs EOM).  The drive should attempt to write all buffered data
>  > after reaching the warning mark and then return EOT to the host.  If
>  > true, then this particular issue is probably not a big deal for DLT
>  > users.  I have no idea if other technology deals with it in similar ways
>  > or not.
>
> ...tf this understanding is true, then wouldn't the above
> hypothesis would be false??
>
> Apologies for being especially ornery today.
>
> Has anyone read the last saves on some DLT tapes lately?
> =:)
>
> Perhaps it's worth pointing out that if we second-guess
> vendor's specs, software's functionality, and the like, then
> there would be no time to get any real work done!
>
> steve
> - - -
> systems & network guy
> high energy physics
> university of wisconsin
>
> --
> Note: To sign off this list, send a "signoff networker" command via email
> to listserv AT listmail.temple DOT edu or visit the list's Web site at
> http://listmail.temple.edu/archives/networker.html where you can
> also view and post messages to the list.
> =*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=

--
Note: To sign off this list, send a "signoff networker" command via email
to listserv AT listmail.temple DOT edu or visit the list's Web site at
http://listmail.temple.edu/archives/networker.html where you can
also view and post messages to the list.
=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=