From oracle-l-bounce@freelists.org Mon Jun 27 12:28:02 2005 Return-Path: Received: from air891.startdedicated.com (root@localhost) by orafaq.com (8.12.10/8.12.10) with ESMTP id j5RHS2AP031373 for ; Mon, 27 Jun 2005 12:28:02 -0500 X-ClientAddr: 206.53.239.180 Received: from turing.freelists.org (freelists-180.iquest.net [206.53.239.180] (may be forged)) by air891.startdedicated.com (8.12.10/8.12.10) with ESMTP id j5RHS0IP031357 for ; Mon, 27 Jun 2005 12:28:00 -0500 Received: from localhost (localhost [127.0.0.1]) by turing.freelists.org (Avenir Technologies Mail Multiplex) with ESMTP id 4755E1C4BA0; Mon, 27 Jun 2005 11:24:30 -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 15812-04; Mon, 27 Jun 2005 11:24:30 -0500 (EST) Received: from turing (localhost [127.0.0.1]) by turing.freelists.org (Avenir Technologies Mail Multiplex) with ESMTP id C1BE81C499A; Mon, 27 Jun 2005 11:24:29 -0500 (EST) DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:reply-to:to:subject:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=JEppZMWeMYO8U76Cyy+LhI7rYOzxFTMKukjX43BP8lHRV3vwmsR2ETmQCfKn+O1r9ezQT6D/pvT/5DusAyvLc3cFPAJ0nGfmqqjQpGsOtyNjdkXocJ8U7IgwXlaW2YYj5fhDWKspBO3OBGh590Wsse9dgWHGB7VzwZoGruV/9nU= Message-ID: <91719bc405062709226673e6d1@mail.gmail.com> Date: Mon, 27 Jun 2005 12:22:43 -0400 From: Paul Vallee To: "oracle-l@freelists.org" , dnt9000@yahoo.com Subject: Re: Identifying source of iowait - is it the DB or the raid array In-Reply-To: <61292a9d05062708324e914d43@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by Ecartis Content-Disposition: inline References: <20050622232158.63966.qmail@web30710.mail.mud.yahoo.com> <61292a9d05062708324e914d43@mail.gmail.com> X-archive-position: 21721 X-ecartis-version: Ecartis v1.0.0 Sender: oracle-l-bounce@freelists.org Errors-To: oracle-l-bounce@freelists.org X-original-sender: paulvallee@gmail.com Precedence: normal Reply-To: paulvallee@gmail.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=-4.2 required=5.0 tests=AWL,BAYES_00 autolearn=ham version=2.63 I have to ask. Is the server Solaris? If so, iowait may not mean what you think it means. I'll await your answer. Paul > > > > On 6/22/05, David Turner wrote: > > > Periodically we have a problem with our raid arrays > > > and suddenly iowait shoots up. Does anyone have a > > > method of identifying the source of iowait. I find it > > > hard to tell whether say the cache on a raid array was > > > disabled versus more processes performing table scans. > > > I understand historical tracking but often don't have > > > this info on the databases. Currently working with 9i. > > > > > > Thx, Dave > > > > > > > > > > > > ____________________________________________________ > > > Yahoo! Sports > > > Rekindle the Rivalries. Sign up for Fantasy Football > > > http://football.fantasysports.yahoo.com > > > -- > > > http://www.freelists.org/webpage/oracle-l > > > > > -- > > http://www.freelists.org/webpage/oracle-l > > > > Greetings Dave, > > I am assuming that its a UNIX server, > > start collecting vmstat , sar and iostat with 1 sec timing > and comapre the results to STATSPACK reports during performance issue > , apart from other SEGMENT stats v$views ... > > > > -- > Regards & Thanks > BN > -- > http://www.freelists.org/webpage/oracle-l > -- -- Paul Vallee President, The Pythian Group, Inc. http://www.pythian.com -- http://www.freelists.org/webpage/oracle-l