X-Original-To: pgsql-general-postgresql.org@localhost.postgresql.org Received: from localhost (mx1.hub.org [200.46.208.251]) by postgresql.org (Postfix) with ESMTP id 46C0F9FA32D; Wed, 10 May 2006 11:51:37 -0300 (ADT) Received: from postgresql.org ([200.46.204.71]) by localhost (mx1.hub.org [200.46.208.251]) (amavisd-new, port 10024) with ESMTP id 10464-02; Wed, 10 May 2006 11:51:25 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey- X-Greylist: from auto-whitelisted by SQLgrey- Received: from suzuka.mcnaught.org (unknown [4.21.254.118]) by postgresql.org (Postfix) with ESMTP id C650E9FA1B0; Wed, 10 May 2006 11:51:25 -0300 (ADT) Received: by suzuka.mcnaught.org (Postfix, from userid 1000) id 214AD167AFD; Wed, 10 May 2006 10:51:22 -0400 (EDT) To: Scott Marlowe Cc: Bruce Momjian , Steve Atkins , PostgreSQL General , "Pgsql-Performance ((E-mail))" Subject: Re: [PERFORM] Arguments Pro/Contra Software Raid References: <200605100102.k4A12wa12853@candle.pha.pa.us> <1147272179.9755.18.camel@state.g2switchworks.com> From: Douglas McNaught Date: Wed, 10 May 2006 10:51:22 -0400 In-Reply-To: <1147272179.9755.18.camel@state.g2switchworks.com> (Scott Marlowe's message of "Wed, 10 May 2006 09:42:59 -0500") Message-ID: <87r732ndat.fsf@suzuka.mcnaught.org> User-Agent: Gnus/5.1006 (Gnus v5.10.6) Emacs/21.4 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Virus-Scanned: Maia Mailguard 1.0.1 X-Archive-Number: 200605/434 X-Sequence-Number: 95226 Scott Marlowe writes: > On Tue, 2006-05-09 at 20:02, Bruce Momjian wrote: >> You do if the controller thinks the data is already on the drives and >> removes it from its cache. > > Bruce, re-read what I wrote. The escalades tell the drives to TURN OFF > THEIR OWN CACHE. Some ATA drives would lie about that too IIRC. Hopefully they've stopped doing it in the SATA era. -Doug