From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dan Mick Subject: Re: skip / disable journal Date: Mon, 15 Apr 2013 15:48:57 -0700 Message-ID: <516C83D9.4030002@inktank.com> References: <516C61EA.60507@profihost.ag> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from mail-pb0-f52.google.com ([209.85.160.52]:53506 "EHLO mail-pb0-f52.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752930Ab3DOWtA (ORCPT ); Mon, 15 Apr 2013 18:49:00 -0400 Received: by mail-pb0-f52.google.com with SMTP id mc8so2759990pbc.39 for ; Mon, 15 Apr 2013 15:49:00 -0700 (PDT) In-Reply-To: <516C61EA.60507@profihost.ag> Sender: ceph-devel-owner@vger.kernel.org List-ID: To: Stefan Priebe Cc: "ceph-devel@vger.kernel.org" On 04/15/2013 01:24 PM, Stefan Priebe wrote: > is there a possibility to disable / skip the jornal? Stuff like > FlashCache, BCache and others seem to work much better but sequential > I/O becomes a bottleneck if the ceph journal is on a single ssd. As far as I know, the journal is a required element for consistency. Sequential I/O is a benefit of the journal.