From owner-freebsd-hackers Fri Aug 30 13:21:10 1996 Return-Path: owner-hackers Received: (from root@localhost) by freefall.freebsd.org (8.7.5/8.7.3) id NAA17967 for hackers-outgoing; Fri, 30 Aug 1996 13:21:10 -0700 (PDT) Received: from irz301.inf.tu-dresden.de (irz301.inf.tu-dresden.de [141.76.1.11]) by freefall.freebsd.org (8.7.5/8.7.3) with SMTP id NAA17955 for ; Fri, 30 Aug 1996 13:21:07 -0700 (PDT) Received: from sax.sax.de (sax.sax.de [193.175.26.33]) by irz301.inf.tu-dresden.de (8.6.12/8.6.12-s1) with ESMTP id WAA18450; Fri, 30 Aug 1996 22:21:04 +0200 Received: (from uucp@localhost) by sax.sax.de (8.6.12/8.6.12-s1) with UUCP id WAA14931; Fri, 30 Aug 1996 22:21:04 +0200 Received: (from j@localhost) by uriah.heep.sax.de (8.7.5/8.6.9) id VAA04350; Fri, 30 Aug 1996 21:55:04 +0200 (MET DST) From: J Wunsch Message-Id: <199608301955.VAA04350@uriah.heep.sax.de> Subject: Re: [Q]: formula for calculating BPI needed To: freebsd-hackers@freebsd.org (FreeBSD hackers) Date: Fri, 30 Aug 1996 21:55:04 +0200 (MET DST) Cc: moos@degnet.baynet.de Reply-To: joerg_wunsch@uriah.heep.sax.de (Joerg Wunsch) In-Reply-To: <3226CAE5.5DC5@degnet.baynet.de> from Darius Moos at "Aug 30, 96 11:05:09 am" X-Phone: +49-351-2012 669 X-PGP-Fingerprint: DC 47 E6 E4 FF A6 E9 8F 93 21 E0 7D F9 12 D6 4E X-Mailer: ELM [version 2.4ME+ PL17 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-hackers@freebsd.org X-Loop: FreeBSD.org Precedence: bulk As Darius Moos wrote: > 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) From reading the man page, yes. From experience, no. I think the man page is wrong here, but i haven't looked into the code. My experience says that dump always ``thinks'' in terms of blocks with one kilobyte per block. The `b' is the tape blocking factor only (number of kilobytes per write()), but is not used otherwise in size calculations. Somebody should review the code, and correct the man page. -- 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. ;-)