Re: Integration work

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

On 08/29/2012 10:20 AM, Sylvain Munaut wrote:
> Hi,
>
>> How about Xen?
>
> I vote for this :)
>
> Using RBD storage for Xen VM images / disks is IMHO a very nice fit,
> the same way people do with QEMU. This should even allow live
> migration of VM.
>

Correct me if I'm wrong, but when I was at Citrix in May this year 
somebody there told me that Xen was going 100% Qemu?

By going 100% Qemu they would also get RBD support.

Wido

> Currently we have to rely on the RBD kernel driver which has some
> downsides (no caching / need recent kernel to get latest ceph
> patches). There also seem to be some weird interactions between RBD
> and Xen that lead to significant performance hits that are not present
> when using only RBD or only Xen.
>
> One possibility would be to develop a blktap driver for xen to provide
> block device backend in userspace using librbd rather than kernel mode
> rbd.
>
> Cheers,
>
>      Sylvain
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