From oracle-l-bounce@freelists.org Tue Nov 22 23:59:09 2005 Return-Path: Received: from air891.startdedicated.com (root@localhost) by orafaq.com (8.12.10/8.12.10) with ESMTP id jAN5x8t9022617 for ; Tue, 22 Nov 2005 23:59:08 -0600 X-ClientAddr: 206.53.239.180 Received: from turing.freelists.org (freelists-180.iquest.net [206.53.239.180]) by air891.startdedicated.com (8.12.10/8.12.10) with ESMTP id jAN5x7AX022605 for ; Tue, 22 Nov 2005 23:59:07 -0600 Received: from localhost (localhost [127.0.0.1]) by turing.freelists.org (Avenir Technologies Mail Multiplex) with ESMTP id D0D62234AA7; Wed, 23 Nov 2005 00:59:02 -0500 (EST) Received: from turing.freelists.org ([127.0.0.1]) by localhost (turing [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 05530-06; Wed, 23 Nov 2005 00:59:02 -0500 (EST) Received: from turing (localhost [127.0.0.1]) by turing.freelists.org (Avenir Technologies Mail Multiplex) with ESMTP id 515142348E1; Wed, 23 Nov 2005 00:59:02 -0500 (EST) Received: with ECARTIS (v1.0.0; list oracle-l); Wed, 23 Nov 2005 00:57:07 -0500 (EST) Received: from localhost (localhost [127.0.0.1]) by turing.freelists.org (Avenir Technologies Mail Multiplex) with ESMTP id 9A929234B5F for ; Wed, 23 Nov 2005 00:57:07 -0500 (EST) Received: from turing.freelists.org ([127.0.0.1]) by localhost (turing [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 05214-09 for ; Wed, 23 Nov 2005 00:57:07 -0500 (EST) Received: from mail.pdx.polyserve.com (fw.pdx.polyserve.com [216.64.170.67]) by turing.freelists.org (Avenir Technologies Mail Multiplex) with ESMTP id 580BC234AA7 for ; Wed, 23 Nov 2005 00:57:07 -0500 (EST) Received: from ex1.ms.polyserve.com (ex1.ms.polyserve.com [10.1.0.50]) by mail.pdx.polyserve.com (Postfix) with ESMTP id 86A625EC36A for ; Tue, 22 Nov 2005 21:57:06 -0800 (PST) X-MimeOLE: Produced By Microsoft Exchange V6.5.7226.0 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by Ecartis Subject: RE: linux DBA's: O_Direct Date: Tue, 22 Nov 2005 21:57:06 -0800 Message-ID: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: linux DBA's: O_Direct Thread-Index: AcXv4sDtxqrFIYS5RNaw+d0aPmmR3QAD4q0Q From: "Kevin Closson" To: "Oracle-L" X-archive-position: 28612 X-ecartis-version: Ecartis v1.0.0 Sender: oracle-l-bounce@freelists.org Errors-To: oracle-l-bounce@freelists.org X-original-sender: kevinc@polyserve.com Precedence: normal Reply-To: kevinc@polyserve.com X-list: oracle-l X-Virus-Scanned: by amavisd-new-20030616-p9 (Debian) at avenirtech.net X-mailscan-MailScanner-Information: Please contact the ISP for more information X-mailscan-MailScanner: Found to be clean X-MailScanner-From: oracle-l-bounce@freelists.org X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on air891.startdedicated.com X-Spam-Level: X-Spam-Status: No, hits=-4.9 required=5.0 tests=AWL,BAYES_00 autolearn=ham version=2.63 >>>>I run database backups to an ext3 filesystem, using both >>>rman and regular hotbackups on different servers. Linux uses >>>all available ram to cache the writes to ext3, which can If this is RMAN, why isn't oracle using O_DIRECT for the ext3 target? 10gR2 will do open(,O_DIRECT,) on ext3 if you set filesystemio_options=directIO. I would recommend doing that, but then I'd also recommend a filesystem where you can put any thing you please in there - without the worry of landmines to step on...none of this "Uh, I think I'll put some goodies in ocfs filesystem, but then I have to put these other goodies in ext3 so my system doesn't blow up" Kevin Closson Chief Architect, Database Solutions PolyServe www.polyserve.com >>>reduce free memory to 10-20MB (the box has 12GB) - this is >>>how it is supposed to work. Sometimes the kernel is unable >>>to allocate ram for new processes when it drop to this level >>>and causes errors. It seems to me that filesystem block >>>caching is unsuitable for a database server - it is not an >>>issue for OCFS, only for backups to ext3. >>>> >>>>[...] >>>>-- >>>> >>>> >>> >>>-- >>>http://www.freelists.org/webpage/oracle-l >>> >>> >>> -- http://www.freelists.org/webpage/oracle-l