Received: from localhost (maia-5.hub.org [200.46.204.182]) by postgresql.org (Postfix) with ESMTP id 0D7889FBB9A for ; Wed, 4 Apr 2007 12:40:45 -0300 (ADT) Received: from postgresql.org ([200.46.204.71]) by localhost (mx1.hub.org [200.46.204.182]) (amavisd-maia, port 10024) with ESMTP id 96107-08 for ; Wed, 4 Apr 2007 12:40:34 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.4 Received: from lists.commandprompt.com (host-254.commandprompt.net [207.173.203.254]) by postgresql.org (Postfix) with ESMTP id C69CC9FBAE0 for ; Wed, 4 Apr 2007 12:40:34 -0300 (ADT) Received: from [192.168.1.50] (or-67-76-146-141.sta.embarqhsd.net [67.76.146.141]) (authenticated bits=0) by lists.commandprompt.com (8.13.7/8.13.6) with ESMTP id l34FeKra009599 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Wed, 4 Apr 2007 08:40:21 -0700 Message-ID: <4613C6F1.3090009@commandprompt.com> Date: Wed, 04 Apr 2007 08:40:33 -0700 From: "Joshua D. Drake" Organization: Command Prompt, Inc. User-Agent: Thunderbird 1.5.0.10 (X11/20070306) MIME-Version: 1.0 To: Stefan Kaltenbrunner CC: "jason@ohloh.net" , Geoff Tolley , pgsql-performance@postgresql.org Subject: Re: SCSI vs SATA References: <9C0858F5-0A48-4AF9-80FF-E4BA14F0F965@ohloh.net> <4613053F.5070401@polimetrix.com> <4613C14A.4020703@commandprompt.com> <4613C54C.4050207@kaltenbrunner.cc> In-Reply-To: <4613C54C.4050207@kaltenbrunner.cc> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: ClamAV 0.88.5/2987/Sat Mar 31 20:15:28 2007 on projects.commandprompt.com X-Virus-Status: Clean X-Greylist: Sender succeded SMTP AUTH authentication, not delayed by milter-greylist-1.6 (lists.commandprompt.com [192.168.2.159]); Wed, 04 Apr 2007 08:40:21 -0700 (PDT) X-Virus-Scanned: Maia Mailguard 1.0.1 X-Archive-Number: 200704/73 X-Sequence-Number: 23950 >> SATAII brute forces itself through some of its performance, for >> example 16MB write cache on each drive. > > sure but for any serious usage one either wants to disable that > cache(and rely on tagged command queuing or how that is called in SATAII Why? Assuming we have a BBU, why would you turn off the cache? > world) or rely on the OS/raidcontroller implementing some sort of > FUA/write barrier feature(which linux for example only does in pretty > recent kernels) Sincerely, Joshua D. Drake > > > Stefan > > ---------------------------(end of broadcast)--------------------------- > TIP 6: explain analyze is your friend > -- === The PostgreSQL Company: Command Prompt, Inc. === Sales/Support: +1.503.667.4564 || 24x7/Emergency: +1.800.492.2240 Providing the most comprehensive PostgreSQL solutions since 1997 http://www.commandprompt.com/ Donate to the PostgreSQL Project: http://www.postgresql.org/about/donate PostgreSQL Replication: http://www.commandprompt.com/products/