From mboxrd@z Thu Jan 1 00:00:00 1970 From: Howard Chu Subject: Re: Fwd: Fwd: [newstore (again)] how disable double write WAL Date: Mon, 22 Feb 2016 17:17:22 +0000 Message-ID: <56CB42A2.1090901@symas.com> References: <9D046674-EA8B-4CB5-B049-3CF665D4ED64@aevoo.fr> <5661F3A9.8070703@redhat.com> <20151208044640.GL1983@devil.localdomain> <20160216033538.GB2005@devil.localdomain> <56C74B91.9080508@redhat.com> <56CB2FCB.8080105@redhat.com> <56CB346B.50200@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from zill.ext.symas.net ([69.43.206.106]:58628 "EHLO zill.ext.symas.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752376AbcBVRsn (ORCPT ); Mon, 22 Feb 2016 12:48:43 -0500 Received: from cust230-77.nwewn.com ([78.155.230.77] helo=[192.168.1.204]) by zill.ext.symas.net with esmtpsa (TLS1.2:DHE_RSA_AES_128_CBC_SHA1:128) (Exim 4.80) (envelope-from ) id 1aXu6y-0004nR-JZ for ceph-devel@vger.kernel.org; Mon, 22 Feb 2016 09:17:29 -0800 In-Reply-To: <56CB346B.50200@redhat.com> Sender: ceph-devel-owner@vger.kernel.org List-ID: To: Ceph Development (Just as an aside on the Subject - in preliminary testing with a run of the mill 32GB microSD card, LMDB on a raw partition performs synchronous commits ~8x faster than the same card formatted with an ext4 filesystem. There's a huge cost to journaling filesystems that a reliable database engine simply doesn't need.) -- -- Howard Chu CTO, Symas Corp. http://www.symas.com Director, Highland Sun http://highlandsun.com/hyc/ Chief Architect, OpenLDAP http://www.openldap.org/project/