From owner-freebsd-questions@FreeBSD.ORG Thu May 1 14:38:44 2003 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id B2BCA37B401 for ; Thu, 1 May 2003 14:38:44 -0700 (PDT) Received: from gw.nectar.cc (gw.nectar.cc [208.42.49.153]) by mx1.FreeBSD.org (Postfix) with ESMTP id F2EF343F3F for ; Thu, 1 May 2003 14:38:43 -0700 (PDT) (envelope-from nectar@celabo.org) Received: from madman.celabo.org (madman.celabo.org [10.0.1.111]) (using TLSv1 with cipher EDH-RSA-DES-CBC3-SHA (168/168 bits)) (Client CN "madman.celabo.org", Issuer "celabo.org CA" (verified OK)) by gw.nectar.cc (Postfix) with ESMTP id 706A85 for ; Thu, 1 May 2003 16:38:43 -0500 (CDT) Received: by madman.celabo.org (Postfix, from userid 1001) id 9F72778C4A; Thu, 1 May 2003 16:38:42 -0500 (CDT) Date: Thu, 1 May 2003 16:38:42 -0500 From: "Jacques A. Vidrine" To: freebsd-questions@FreeBSD.org Message-ID: <20030501213842.GA58002@madman.celabo.org> Mail-Followup-To: "Jacques A. Vidrine" , freebsd-questions@FreeBSD.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-Url: http://www.celabo.org/ User-Agent: Mutt/1.5.3i-ja.1 Subject: huge file, spanning multiple tapes X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 01 May 2003 21:38:45 -0000 I thought this would be an easy problem to solve, but I haven't found a decent solution after a bit of looking. I have a huge file, say 73GB. I need to dump it to tapes that have a capacity of about 33GB each (but there is hardware compression, so there is no exact capacity). If the file would fit on a single tape, I'd just use good 'ole dd(1). I figured, heck, somebody is _bound_ to have written a simple utility that, say, reads from a pipe and writes to tape (or vice versa), and prompts for a tape switch when it hits end-of-tape. But alas, I cannot find such a beast. Using dump, cpio, etc is not really an option. I need to be able to later read the data from tape into a pipe without it hitting disk. Anybody have bright ideas? Cheers, -- Jacques Vidrine . NTT/Verio SME . FreeBSD UNIX . Heimdal nectar@celabo.org . jvidrine@verio.net . nectar@freebsd.org . nectar@kth.se