dump and TK50 [REPOST]

[Johan Vromans]

I have noticed that dump(8) does not utilize TK50 tapes as it should.

A TK50 can hold about 90Mb of (formatted) data. To dump 200Mb of disk,
dump(8) uses 3.24 tapes. This reates about 60Mb per tape.
When I supply dump with a huge tape length argument, say 13200, it
needs only about 2.5 tapes to dump the same amount of data. However,
dump(8) calculates that it needs 0.3 tapes...

What are the optimal parameters for a TK50? From the specifications,
A TK50 has 600 ft, 6667 BPI, 22 tracks. This yields either density =
22*6667 and length = 600 ft, or density = 6667 and length = 22*600 ft.

	Johan
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