> Hi, > > On 01/13/2013 05:08 PM, Harald Rößler wrote: > > Hi, > > > > couple of month ago I read about a limitation to run an RBD kernel > driver on the osd server. Is this limitation still valid? The reason in > Ubuntu and Debian there is no support for the RBD devices in QEMU. At the > moment, in our setup the KVM's are running on the OSD servers. > > > > I don't think so, but somebody might correct me here. I am the same opinion, but I was not sure, I found this information on some websites including in the "old" CEPH wiki and in the CEPH IRC logs. > > The OSDs nowadays use syncfs which leads them to only syncing their > filesystem instead of ALL the filesystems on that host. > > It might however be that Qemu calls sync() instead of syncfs() which > still causes everything to be synced, which can lead to problems I guess. Thank you for this information, If I got it right, use the kernel driver on the host system I can expect more performance than via QEMU. I will test it on our development system. > > Regarding your reason for doing this, RBD is supported in Ubuntu's Qemu. > > Under Ubuntu precise it already works: > http://packages.ubuntu.com/precise/qemu-kvm > > The problem is that the shipped version of Ceph is 0.41, which might be > too old. > > I've been following the Blueprint for Ubuntu 13.04 and that will have > all the Ceph stuff (Qemu and libvirt) you want with version 0.56.1 I will keep this in mind. Thanks!! > > 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@xxxxxxxxxxxxxxx > > More majordomo info at http://vger.kernel.org/majordomo-info.html > > > -- > To unsubscribe from this list: send the line "unsubscribe ceph-devel" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html Best Regards Harald Roessler -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
