Dumping to an exabyte tape drive

[Duncan McEwan]

I'm not sure that this is the most appropriate group for this query, but I
guess it will reach most of the people who will be able to answer it.

I have just started using an exabyte tape drive to do dumps of our file
systems.  Could someone please tell me the appropriate values to give
to dump (tape length, density, inter-record gap (is this relevent for this
encoding format?)) to allow dump to fully utilise each tape.

For now I am kludging it using a bogus tape length of ~200000 feet (estimated
by knowing that dump will write approx 64MB onto a 5400 ft streamer cartridge),
but I would like to know the correct values.  In particular, how much *can*
you fit on a single 90 minute tape, and how long are the tapes?

I will summari[zs]e to this group any replies by email that aren't also posted
here.

Duncan