Received: from localhost (maia-3.hub.org [200.46.204.184]) by postgresql.org (Postfix) with ESMTP id 020A89FB5FE for ; Wed, 4 Apr 2007 12:59:42 -0300 (ADT) Received: from postgresql.org ([200.46.204.71]) by localhost (mx1.hub.org [200.46.204.184]) (amavisd-maia, port 10024) with ESMTP id 80520-01-3 for ; Wed, 4 Apr 2007 12:59:18 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.4 Received: from cronos.madness.at (madness.at [217.196.146.217]) by postgresql.org (Postfix) with ESMTP id 06CCB9FBA8E for ; Wed, 4 Apr 2007 12:59:18 -0300 (ADT) Received: from congw.dc1.conova.com ([217.196.145.250] helo=[192.168.1.61]) by cronos.madness.at with esmtpsa (TLS-1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.63) (envelope-from ) id 1HZ7t7-0002JD-JA; Wed, 04 Apr 2007 17:59:15 +0200 Message-ID: <4613CB60.6030505@kaltenbrunner.cc> Date: Wed, 04 Apr 2007 17:59:28 +0200 From: Stefan Kaltenbrunner User-Agent: Icedove 1.5.0.10 (X11/20070307) MIME-Version: 1.0 To: "Joshua D. Drake" 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> <4613C6F1.3090009@commandprompt.com> In-Reply-To: <4613C6F1.3090009@commandprompt.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: Maia Mailguard 1.0.1 X-Archive-Number: 200704/77 X-Sequence-Number: 23954 Joshua D. Drake wrote: > >>> 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? the BBU is usually only protecting the memory of the (hardware) raid controller not the one in the drive ... Stefan