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Date: Fri, 30 Aug 1996 11:05:09 +0000
From: Darius Moos <moos@degnet.baynet.de>
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To: Joerg Wunsch <joerg_wunsch@uriah.heep.sax.de>
CC: freebsd-hackers <freebsd-hackers@FreeBSD.org>,
        FreeBSD-questions <questions@FreeBSD.org>
Subject: Re: [Q]: formula for calculating BPI needed
References: <199608300540.HAA27769@uriah.heep.sax.de>
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Hi Joerg,

i think Jonathan is right with the meaning of the commandlineoptions.
  B -> number of block per file/tape
  b -> number of KILObytes per block
  (as the manpage states it)
Anyway i think that you are right that B should be 50.000
and not 500.000 as Jonathan wrote it.

Darius Moos.

email: moos@degnet.baynet.de

J Wunsch wrote:
> 
> As Jonathan M. Bresler wrote:
> 
> >       trying to use bpi for a DAT tape ;)
> >       bpi is from the days of 9-track tapes.  use B and b instead.
> >
> >       B -- number of dump records
> >       b -- number of kilobytes per dump record.
> >
> >       for a 2GB tape try 500000 40
> >
> >       dump Bbf 500000 40 /dev/rst0 <filesystem>
> 
> Are you sure?  I'm under the impression that `B' is always measured in
> kilobytes.  This is from experience, not from the man page. :)  (Btw.,
> you've got one `0' too much anyway.)
> 
>         dump 0uBb 2000000 32 <filesystem>
> 
> is what i'm using on DAT.
> 
> --
> 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. ;-)