From owner-freebsd-arch Tue Dec 21 0: 3:18 1999 Delivered-To: freebsd-arch@freebsd.org Received: from ns1.yes.no (ns1.yes.no [195.204.136.10]) by hub.freebsd.org (Postfix) with ESMTP id 2043E14FA1 for ; Tue, 21 Dec 1999 00:03:16 -0800 (PST) (envelope-from eivind@bitbox.follo.net) Received: from bitbox.follo.net (bitbox.follo.net [195.204.143.218]) by ns1.yes.no (8.9.3/8.9.3) with ESMTP id JAA07469 for ; Tue, 21 Dec 1999 09:03:14 +0100 (CET) Received: (from eivind@localhost) by bitbox.follo.net (8.8.8/8.8.6) id JAA24419 for freebsd-arch@freebsd.org; Tue, 21 Dec 1999 09:03:14 +0100 (MET) Received: from feral.com (feral.com [192.67.166.1]) by hub.freebsd.org (Postfix) with ESMTP id 0B047153E5 for ; Tue, 21 Dec 1999 00:03:07 -0800 (PST) (envelope-from mjacob@feral.com) Received: from beppo.feral.com (beppo [192.67.166.79]) by feral.com (8.9.3/8.9.3) with ESMTP id AAA14752; Tue, 21 Dec 1999 00:04:56 -0800 Date: Tue, 21 Dec 1999 00:04:56 -0800 (PST) From: Matthew Jacob Reply-To: mjacob@feral.com To: "Rodney W. Grimes" Cc: freebsd-arch@freebsd.org, Stephen McKay , Greg Lehey , Bob Bishop , Thomas David Rivers , Joerg Wunsch , Hauke Fath Subject: Re: filemarks? In-Reply-To: <199912210759.XAA45289@gndrsh.dnsmgr.net> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-arch@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG > Trying to put any more data on tape after EARLY WARNING will make your > tapes _extreamly_ non-portable. Infact doing anthing more than either > writting filemarks, or bsr and filemarks will make your tape(s) unreadable > on most systems out there. > > I think this is covered in one of the ANSI specs, but can't find a reference > handy :-(. > > I do know from first hand work with things like VMS Backup that the SOP > on early warning is, bsr, weof, weof, rewind. And in every tape application > I have ever worked on that handled multivolumes on just about any tape > drive accross any system this was what _had_ to happen to make it work, > independent of tape drive type (9-track, mega-tape, QIC, 8mm, dat). > > Only applications intimately familiar with the tape drive they are working > with should ever try to count on data being correct past Early Warning, > independent of if you are reading or writing. Okay. How about commenting on the 'read' side again? To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message