Received: from localhost (maia-1.hub.org [200.46.204.191]) by postgresql.org (Postfix) with ESMTP id 936779FBF83 for ; Wed, 11 Jul 2007 13:09:14 -0300 (ADT) Received: from postgresql.org ([200.46.204.71]) by localhost (mx1.hub.org [200.46.204.191]) (amavisd-maia, port 10024) with ESMTP id 26576-03 for ; Wed, 11 Jul 2007 13:09:07 -0300 (ADT) X-Greylist: delayed 00:21:14.798283 by SQLgrey-1.7.5 Received: from svr4.postgresql.org (svr4.postgresql.org [66.98.251.159]) by postgresql.org (Postfix) with ESMTP id B744F9FB9B9 for ; Wed, 11 Jul 2007 13:09:09 -0300 (ADT) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.3 Received: from skynet.simkin.ca (skynet.simkin.ca [72.51.27.117]) by svr4.postgresql.org (Postfix) with ESMTP id 29A2A5AF2CB for ; Wed, 11 Jul 2007 15:47:52 +0000 (GMT) Received: from charon.medialogik.com (charon.medialogik.com [72.51.27.114]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by skynet.simkin.ca (Postfix) with ESMTP id ACA07400E for ; Wed, 11 Jul 2007 08:47:45 -0700 (PDT) From: Alan Hodgson Organization: Simkin Network Consulting To: pgsql-performance@postgresql.org Subject: Re: WALL on controller without battery? Date: Wed, 11 Jul 2007 08:47:44 -0700 User-Agent: KMail/1.9.5 References: <20070711153620.GP1241@phlogiston.dyndns.org> In-Reply-To: <20070711153620.GP1241@phlogiston.dyndns.org> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200707110847.44612@hal.medialogik.com> X-Virus-Scanned: Maia Mailguard 1.0.1 X-Archive-Number: 200707/97 X-Sequence-Number: 25781 On Wednesday 11 July 2007 08:36, Andrew Sullivan wrote: > Put the WAL where the battery is. Even if it's slower (and I don't > know whether it will be), I assume that having the right data more > slowly is better than maybe not having the data at all, quickly. > Presumably he'll have the 2-port configured for write-through operation. I would spring for a 4-port with a BBU, though, and then put the WAL on the drives with the OS. -- "Bad laws are the worst sort of tyranny." -- Edmund Burke (1729-1797)