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.
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.
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'd look into that.
Wido
Best Regards
Harald Roessler
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