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List:       freebsd-hackers
Subject:    Re: [Q]: formula for calculating BPI needed
From:       J Wunsch <j () uriah ! heep ! sax ! de>
Date:       1996-08-31 5:36:52
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As Jonathan M. Bresler wrote:

> "B records per volume" what is the capacity of the tape in units of "records".
> "b kB per records"     what is a "record", the unit of the "B" option.

No.  `b' is *NOT* the unit of the `B' option:

		case 'b':		/* blocks per tape write */
			ntrec = numarg('b', "number of blocks per write",
...
		case 'B':		/* blocks per output file */
			blocksperfile = numarg('B', "number of blocks per file",
...

I think this makes it clearer than the man page is.  The unit of the
`B' option is always `blocks', which is `blocks of 1 KB' for dump's
purpose.

The sole meaning of `b' is to specify how many of these 1 KB blocks
should be written at once.

-- 
cheers, J"org

joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE
Never trust an operating system you don't have sources for. ;-)

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