Received: from maia.hub.org (maia-4.hub.org [200.46.204.183]) by mail.postgresql.org (Postfix) with ESMTP id F1A5E63311B for ; Sat, 8 May 2010 05:07:23 -0300 (ADT) Received: from mail.postgresql.org ([200.46.204.86]) by maia.hub.org (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 07792-01 for ; Sat, 8 May 2010 08:07:16 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from mail.postnewspapers.com.au (202-89-185-120.static.dsl.amnet.net.au [202.89.185.120]) by mail.postgresql.org (Postfix) with ESMTP id 90DE3632DE9 for ; Sat, 8 May 2010 05:07:16 -0300 (ADT) Received: from localhost (localhost [127.0.0.1]) by mail.postnewspapers.com.au (Postfix) with ESMTP id 29461AF2A4; Sat, 8 May 2010 16:07:02 +0800 (WST) X-Virus-Scanned: Debian amavisd-new at postnewspapers.com.au Received: from mail.postnewspapers.com.au ([127.0.0.1]) by localhost (mail.postnewspapers.com.au [127.0.0.1]) (amavisd-new, port 10024) with LMTP id CM-8CrX+WoPU; Sat, 8 May 2010 16:06:57 +0800 (WST) Received: from [10.1.1.7] (203-59-35-207.dyn.iinet.net.au [203.59.35.207]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "Craig Ringer", Issuer "POST Certificate Authority" (verified OK)) by mail.postnewspapers.com.au (Postfix) with ESMTPSA id EB89AAF2A3; Sat, 8 May 2010 16:06:56 +0800 (WST) Message-ID: <4BE51BA5.70202@postnewspapers.com.au> Date: Sat, 08 May 2010 16:07:01 +0800 From: Craig Ringer User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-GB; rv:1.9.1.9) Gecko/20100317 Thunderbird/3.0.4 MIME-Version: 1.0 To: Josh Berkus CC: pgsql-hackers@postgresql.org Subject: Re: no universally correct setting for fsync References: <4BE3D3930200002500031382@gw.wicourts.gov> <4BE425F7.30804@dunslane.net> <4BE3E205020000250003138F@gw.wicourts.gov> <4BE4543D.8010309@agliodbs.com> In-Reply-To: <4BE4543D.8010309@agliodbs.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=-1.9 tagged_above=-5 required=5 tests=BAYES_00=-1.9 X-Spam-Level: X-Archive-Number: 201005/388 X-Sequence-Number: 162051 On 8/05/2010 1:56 AM, Josh Berkus wrote: > >> I never meant to suggest any statement in that section is factually >> wrong; it's just all too rosy, leading people to believe it's no big >> deal to turn it off. > > Yeah, that section is overdue for an update. I'll write some new text > and post it to pgsql-docs. It's probably worth mentioning that people who want to turn off fsync to gain a performance boost should instead look at a RAID controller with a BBU so they can safely enable write-back caching, getting most of the benefits of fsync=off safely. -- Craig Ringer