From oracle-l-bounce@freelists.org Thu Sep 15 14:39:05 2005 Return-Path: Received: from air891.startdedicated.com (root@localhost) by orafaq.com (8.12.10/8.12.10) with ESMTP id j8FJd5WR003020 for ; Thu, 15 Sep 2005 14:39:05 -0500 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 j8FJd16H003000 for ; Thu, 15 Sep 2005 14:39:01 -0500 Received: from localhost (localhost [127.0.0.1]) by turing.freelists.org (Avenir Technologies Mail Multiplex) with ESMTP id 7E5101ED6C0; Thu, 15 Sep 2005 14:38:46 -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 30079-03; Thu, 15 Sep 2005 14:38:46 -0500 (EST) Received: from turing (localhost [127.0.0.1]) by turing.freelists.org (Avenir Technologies Mail Multiplex) with ESMTP id F19081ED6C3; Thu, 15 Sep 2005 14:38:45 -0500 (EST) X-MimeOLE: Produced By Microsoft Exchange V6.5.7226.0 Content-class: urn:content-classes:message Subject: RE: I/O tuning... Allocating spindles to databases MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Date: Thu, 15 Sep 2005 12:36:52 -0700 Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by Ecartis Message-ID: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: I/O tuning... Allocating spindles to databases Thread-Index: AcW6KQP79SqslZBmQ4yTRpYql5YgTwAAmL9wAAAg8LAAADnOsA== From: "Kevin Closson" To: "Mercadante, Thomas F (LABOR)" , , Cc: , X-archive-position: 25548 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-Level: X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on air891.startdedicated.com X-Spam-Status: No, hits=-4.8 required=5.0 tests=AWL,BAYES_00 autolearn=ham version=2.63 absolutely..it is VERY real life to have an access pattern that completely obliterates cache... I can't count how many shops I've known that completely glue a high end EMC to the wall and lament the fact that there is no way to disable the cache... that was on particular models, I don't claim to be an EMC expert by any means. >>>-----Original Message----- >>>From: Mercadante, Thomas F (LABOR) >>>[mailto:Thomas.Mercadante@labor.state.ny.us] >>>Sent: Thursday, September 15, 2005 12:33 PM >>>To: kevinc@polyserve.com; jkstill@gmail.com; >>>cmarquez@collegeboard.org >>>Cc: bob_murching@budco.com; oracle-l@freelists.org >>>Subject: RE: I/O tuning... Allocating spindles to databases >>> >>>But would something like this ever really happen in real >>>life. We can all make hardware/software fail once we know >>>what its weaknesses are. >>> >>>Hell, I can make a database server fail. Quite simple >>>really. Walk into the server room and flip the breaker. >>>Shuts down every time! >>> >>>-----Original Message----- >>>From: oracle-l-bounce@freelists.org >>>[mailto:oracle-l-bounce@freelists.org] On Behalf Of Kevin Closson >>>Sent: Thursday, September 15, 2005 3:26 PM >>>To: jkstill@gmail.com; cmarquez@collegeboard.org >>>Cc: bob_murching@budco.com; oracle-l@freelists.org >>>Subject: RE: I/O tuning... Allocating spindles to databases >>> >>> >>> >>>>>>It isn't too difficult to write a simulation that will render the >>>>>>cache useless. >>> >>>actually quite easy. create a file that is 100 fold larger >>>than cache and do completely random 4KB transfers. >>> >>>smoked >>> >>> >>> >>> >>> >>> >>> >>> >>> >>>>>> >>>>>> >>>>>>-- >>>>>>Jared Still >>>>>>Certifiable Oracle DBA and Part Time Perl Evangelist >>>>>>11+ years of trying to appear to know what I'm doing. >>>>>>-- >>>>>>http://www.freelists.org/webpage/oracle-l >>>>>> >>>-- >>>http://www.freelists.org/webpage/oracle-l >>> -- http://www.freelists.org/webpage/oracle-l