From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mykola Golub Subject: Re: why rbd journaling first write journal to journal pool and then write data Date: Mon, 22 Aug 2016 12:16:13 +0300 Message-ID: <20160822091612.GA32073@gmail.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from mail-lf0-f41.google.com ([209.85.215.41]:32785 "EHLO mail-lf0-f41.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751754AbcHVJQR (ORCPT ); Mon, 22 Aug 2016 05:16:17 -0400 Received: by mail-lf0-f41.google.com with SMTP id b199so73101722lfe.0 for ; Mon, 22 Aug 2016 02:16:16 -0700 (PDT) Content-Disposition: inline In-Reply-To: Sender: ceph-devel-owner@vger.kernel.org List-ID: To: Jaze Lee Cc: ceph-devel@vger.kernel.org Jaze, On Mon, Aug 22, 2016 at 04:46:04PM +0800, Jaze Lee wrote: > I found that rbd journaling first write journal and then write data. > Why we not first write data and then write journal? Is there some > considerration > for which is first ? It looks like you already asked this question some time ago. Have you missed Jason's response? http://www.spinics.net/lists/ceph-devel/msg30167.html Or are you unsatisfied with his answer? -- Mykola Golub