Received: from localhost (maia-1.hub.org [200.46.204.191]) by postgresql.org (Postfix) with ESMTP id 78CB29F938C for ; Wed, 6 Dec 2006 12:44:38 -0400 (AST) Received: from postgresql.org ([200.46.204.71]) by localhost (mx1.hub.org [200.46.204.191]) (amavisd-new, port 10024) with ESMTP id 66577-05-2 for ; Wed, 6 Dec 2006 12:44:26 -0400 (AST) X-Greylist: from auto-whitelisted by SQLgrey-1.7.4 Received: from mx01.bfk.de (mx01.bfk.de [193.227.124.2]) by postgresql.org (Postfix) with ESMTP id EEDDA9F9F47 for ; Wed, 6 Dec 2006 12:44:26 -0400 (AST) Received: from [10.119.110.2] (helo=mx00.int.bfk.de) by mx01.bfk.de with esmtp id 1Grzsd-0003xt-OL; Wed, 06 Dec 2006 17:44:23 +0100 Received: from fweimer by bfk.de with local id 1Grzsd-0005LR-87; Wed, 06 Dec 2006 17:44:23 +0100 To: Brian Wipf Cc: pgsql-performance@postgresql.org Subject: Re: File Systems Compared References: From: Florian Weimer Date: Wed, 06 Dec 2006 17:44:23 +0100 In-Reply-To: (Brian Wipf's message of "Wed, 6 Dec 2006 08:40:55 -0700") Message-ID: <82bqmh3rfc.fsf@mid.bfk.de> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable X-Virus-Scanned: Maia Mailguard 1.0.1 X-Archive-Number: 200612/126 X-Sequence-Number: 22182 * Brian Wipf: > Anyone run their RAIDs with disk caches enabled, or is this akin to > having fsync off? If your cache is backed by a battery, enabling write cache shouldn't be a problem. You can check if the whole thing is working well by running this test script: Enabling write cache leads to various degrees of data corruption in case of a power outage (possibly including file system corruption requiring manual recover). --=20 Florian Weimer BFK edv-consulting GmbH http://www.bfk.de/ Kriegsstra=DFe 100 tel: +49-721-96201-1 D-76133 Karlsruhe fax: +49-721-96201-99