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        We run with a fragment size of 2G and, AFAIK, backup speed is not
impacted  at all (or significantly, at least).  The gain comes when
doing
a restore as the process can skip across whole fragments before reaching
the area of the tape containing the material to be restored.

        With a zero fragment size (i.e. don't fragment), the tar images
are written as a single monolithic block which is slower to scan
through.

        I didn't understand Fabrice's point about end of tape -- I don't
see how running "off the end" is better / worse if using fragments or
not.
Can someone enlighten me on this point?


Cheers,

Richard.
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