Re: rbd kernel driver on the osd server

[Wido den Hollander <wido@widodh.nl>]

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
> --
> 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" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html