From owner-freebsd-fs Mon Nov 1 7: 4:41 1999 Delivered-To: freebsd-fs@freebsd.org Received: from worf.qntm.com (worf.qntm.com [146.174.250.100]) by hub.freebsd.org (Postfix) with ESMTP id 84DEA14BC2 for ; Mon, 1 Nov 1999 07:04:29 -0800 (PST) (envelope-from Stephen.Byan@quantum.com) Received: from mail3.qntm.com by worf.qntm.com with ESMTP (1.40.112.12/16.2) id AA146378668; Mon, 1 Nov 1999 07:04:28 -0800 Received: from milcmima.qntm.com (milcmima.qntm.com [146.174.18.61]) by mail3.qntm.com (8.8.6/8.8.6) with ESMTP id HAA14917 for ; Mon, 1 Nov 1999 07:04:29 -0800 (PST) Received: by milcmima.qntm.com with Internet Mail Service (5.5.2650.10) id ; Mon, 1 Nov 1999 07:04:25 -0800 Message-Id: <8133266FE373D11190CD00805FA768BF02EE9DD7@shrcmsg1.tdh.qntm.com> From: Stephen Byan To: freebsd-fs@FreeBSD.ORG Subject: RE: journaling UFS and LFS Date: Mon, 1 Nov 1999 07:04:24 -0800 Mime-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2650.10) Content-Type: text/plain; charset="iso-8859-1" Sender: owner-freebsd-fs@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org >Chang Song [mailto:song@zk3.dec.com] wrote: > >Don wrote: >> >> Softupdates is definitely a viable solution however it does not address >> several issues and the license is not a BSD license so it makes me >> uncomfortable. > >Could you let me know what SoftUpdate does not address? >Thank you. One potential problem with soft updates is that the order of creation/deletion/truncation/etc of files is not preserved through a crash or power outage, wheras UFS and logged file systems (not logging file systems as in LFS; what do you say the kind that maintain a recovery log in addition to their regular metadata?) preserve this ordering. I wonder how many recovery strategies are broken by soft updates. Anyone have any data? Regards, -Steve Steve Byan Design Engineer Quantum Corporation MS 1-3/E23 333 South Street Shrewsbury, MA 01545 voice: (508) 770-3414 fax: (508) 770-2604 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-fs" in the body of the message