From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wido den Hollander Subject: Re: rbd kernel driver on the osd server Date: Sun, 13 Jan 2013 19:00:18 +0100 Message-ID: <50F2F632.6060402@widodh.nl> References: <20130113160840.GF27442@hro-mlt-02.local> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from smtp01.mail.pcextreme.nl ([109.72.87.137]:37710 "EHLO smtp01.mail.pcextreme.nl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754669Ab3AMSAZ (ORCPT ); Sun, 13 Jan 2013 13:00:25 -0500 In-Reply-To: <20130113160840.GF27442@hro-mlt-02.local> Sender: ceph-devel-owner@vger.kernel.org List-ID: To: =?ISO-8859-1?Q?Harald_R=F6=DFler?= Cc: "ceph-devel@vger.kernel.org" Hi, On 01/13/2013 05:08 PM, Harald R=F6=DFler wrote: > Hi, > > couple of month ago I read about a limitation to run an RBD kernel dr= iver on the osd server. Is this limitation still valid? The reason in U= buntu and Debian there is no support for the RBD devices in QEMU. At th= e moment, in our setup the KVM's are running on the OSD servers. > I don't think so, but somebody might correct me here. The OSDs nowadays use syncfs which leads them to only syncing their=20 filesystem instead of ALL the filesystems on that host. It might however be that Qemu calls sync() instead of syncfs() which=20 still causes everything to be synced, which can lead to problems I gues= s. Regarding your reason for doing this, RBD is supported in Ubuntu's Qemu= =2E Under Ubuntu precise it already works:=20 http://packages.ubuntu.com/precise/qemu-kvm The problem is that the shipped version of Ceph is 0.41, which might be= =20 too old. I've been following the Blueprint for Ubuntu 13.04 and that will have=20 all the Ceph stuff (Qemu and libvirt) you want with version 0.56.1 I'd look into that. Wido > Best Regards > Harald Roessler > -- > To unsubscribe from this list: send the line "unsubscribe ceph-devel"= in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- 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