X-Original-To: pgsql-performance-postgresql.org@localhost.postgresql.org Received: from localhost (av.hub.org [200.46.204.144]) by postgresql.org (Postfix) with ESMTP id D428C9DC9A8 for ; Mon, 27 Feb 2006 06:13:09 -0400 (AST) Received: from postgresql.org ([200.46.204.71]) by localhost (av.hub.org [200.46.204.144]) (amavisd-new, port 10024) with ESMTP id 93836-05 for ; Mon, 27 Feb 2006 06:13:11 -0400 (AST) X-Greylist: from auto-whitelisted by SQLgrey- Received: from service-web.de (p15093784.pureserver.info [217.160.106.224]) by postgresql.org (Postfix) with ESMTP id CAB179DC825 for ; Mon, 27 Feb 2006 06:13:07 -0400 (AST) Received: from [10.100.1.50] (074-016-066-080.eggenet.de [80.66.16.74]) by service-web.de (Postfix) with ESMTP id 5463920002A; Mon, 27 Feb 2006 11:13:09 +0100 (CET) Message-ID: <4402D0A9.7080705@wildenhain.de> Date: Mon, 27 Feb 2006 11:12:57 +0100 From: Tino Wildenhain User-Agent: Mozilla Thunderbird 1.0.6 (X11/20050929) X-Accept-Language: de-DE, de, en-us, en MIME-Version: 1.0 To: Javier Somoza Cc: pgsql-performance@postgresql.org Subject: Re: fsync and battery-backed caches References: <1141034594.1556.15.camel@pndsoft> In-Reply-To: <1141034594.1556.15.camel@pndsoft> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: by amavisd-new at hub.org X-Spam-Status: No, score=0.103 required=5 tests=[AWL=0.103] X-Spam-Score: 0.103 X-Spam-Level: X-Archive-Number: 200602/410 X-Sequence-Number: 17396 Javier Somoza schrieb: > > Hi all > > Is it secure to disable fsync havin battery-backed disk cache? > > Thx > No. fsync moves the data from OS memory cache to disk-adaptor cache which is required to benefit from battery backup. If this data is written to the plates immediately depends on settings of your disk adaptor card. Regards Tino