From mboxrd@z Thu Jan 1 00:00:00 1970 From: Josh Durgin Subject: Re: how to debug slow rbd block device Date: Tue, 22 May 2012 23:30:11 -0700 Message-ID: <4FBC83F3.7070400@inktank.com> References: <4FBB8A5B.9010500@profihost.ag> <4FBBEBC8.1000205@profihost.ag> <1C70F3FB753C4AEC97247E04FAE3C733@inktank.com> <4FBBF74C.9020608@profihost.ag> <45F1742481D84E7A90951816DB23609F@inktank.com> <4FBBFE7B.4060406@profihost.ag> <65E9589544C4489F93761035433ADC01@inktank.com> <4FBC811F.5060004@profihost.ag> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from mail-pz0-f46.google.com ([209.85.210.46]:62459 "EHLO mail-pz0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752313Ab2EWGaN (ORCPT ); Wed, 23 May 2012 02:30:13 -0400 Received: by dady13 with SMTP id y13so9294861dad.19 for ; Tue, 22 May 2012 23:30:13 -0700 (PDT) In-Reply-To: <4FBC811F.5060004@profihost.ag> Sender: ceph-devel-owner@vger.kernel.org List-ID: To: Stefan Priebe - Profihost AG Cc: Greg Farnum , ceph-devel@vger.kernel.org On 05/22/2012 11:18 PM, Stefan Priebe - Profihost AG wrote: > Hi, > >>> So try enabling RBD writeback caching =E2=80=94 see http://marc.inf= o >>> /?l=3Dceph-devel&m=3D133758599712768&w=3D2 >>> will test tomorrow. Thanks. > Can we path this to the qemu-drive option? Yup, see http://article.gmane.org/gmane.comp.file-systems.ceph.devel/64= 00 The normal qemu cache=3Dwriteback/writethrough/none option will work in= =20 qemu 1.2. Josh -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html