From owner-freebsd-questions@FreeBSD.ORG Tue Aug 11 03:14:15 2009 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 062CE106566C for ; Tue, 11 Aug 2009 03:14:15 +0000 (UTC) (envelope-from jhall@socket.net) Received: from mf5.socket.net (mf5b.socket.net [216.106.26.210]) by mx1.freebsd.org (Postfix) with ESMTP id D71B38FC25 for ; Tue, 11 Aug 2009 03:14:14 +0000 (UTC) Received: from [10.129.40.203] (216.106.12.14.reverse.socket.net [216.106.12.14]) by mf5.socket.net (Postfix) with ESMTP id 09BD16064F; Mon, 10 Aug 2009 22:14:13 -0500 (CDT) Message-Id: From: Jay Hall To: Mel Flynn In-Reply-To: <200908101908.36042.mel.flynn+fbsd.questions@mailing.thruhere.net> Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (Apple Message framework v935.3) Date: Mon, 10 Aug 2009 22:14:13 -0500 References: <6206A242-7226-48E3-8D09-A1D3A651F2A8@socket.net> <20090810170921.GC49364@slackbox.xs4all.nl> <200908101908.36042.mel.flynn+fbsd.questions@mailing.thruhere.net> X-Mailer: Apple Mail (2.935.3) Cc: Roland Smith , freebsd-questions@freebsd.org Subject: Re: Backup Size X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 11 Aug 2009 03:14:15 -0000 > > Difficult. 512 bytes per entry + 1024 (EOF). See man 5 tar. But > since files > will be padded there is some extra overhead. Also, it is hard to > calculate > hard links and sparse files. Tar will handle these correctly (i.e. > preserve > hard links and detect sparse files and try not archive "blocks of > nulls") but > it is hard to calculate the size because of this before the archive > operation > because of this. > -- > Mel Thanks. I have been able to come close, but not exact. Looks like close will have to be good enough. Thanks again. Jay