From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Peter Teoh" Subject: Re: Mentor for a GSoC application wanted (Online ext2/3 filesystem checker) Date: Wed, 23 Apr 2008 09:02:17 +0800 Message-ID: <804dabb00804221802l19d86cm4cbd2082aefa7ac2@mail.gmail.com> References: <20080419012952.GE25797@mit.edu> <20080419185603.GA30449@mit.edu> <480A42F6.2030005@redhat.com> <804dabb00804220954s67d56cacj89098d88697565aa@mail.gmail.com> <480E4950.1090300@oracle.com> <804dabb00804221633g1f61029dh7b27737134fc0b7a@mail.gmail.com> <480E7954.9090408@oracle.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: linux-fsdevel@vger.kernel.org To: "Sunil Mushran" Return-path: Received: from hs-out-0708.google.com ([64.233.178.246]:8158 "EHLO hs-out-0708.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759063AbYDWBCS (ORCPT ); Tue, 22 Apr 2008 21:02:18 -0400 Received: by hs-out-0708.google.com with SMTP id 4so1405891hsl.5 for ; Tue, 22 Apr 2008 18:02:18 -0700 (PDT) In-Reply-To: <480E7954.9090408@oracle.com> Content-Disposition: inline Sender: linux-fsdevel-owner@vger.kernel.org List-ID: On Wed, Apr 23, 2008 at 7:48 AM, Sunil Mushran wrote: > Peter Teoh wrote: > > > I understood that, and that was what I said "memory + journal log > > file" except that perhaps a better term for journal log will be redo > > log. Correct? > > > redolog would be the appropriate term. But the point still is that oracle > does not stop writing to the db file when it is in hot backup mode. That > would be sheer madness as the user may not stop the backup mode for say > a day or maybe a week. It keeps writing to the dbfiles but at the same time > generates more redo to ensure it can handle fractured blocks when one is > restoring from those backups. > Ah....now I understood your point: few days of backing up (due to large size of dbfiles) + fractured blocks....key words I have learned from you.....must thank you for your sharing.... > Ok, now I must admit that online fsck is extremely difficult - given that I no longer have an option of fs-snapshot for readonly at a point in time, which is my only way of doing it so far. Thank you for the discussion! :-). -- Regards, Peter Teoh