Hi,

> I am doing some experimentation with Ceph and Xen (on the same host) and I'm
> experiencing some problems with the rbd device that I'm using as the block
> device.  My environment is:

AFAIK running the OSD and the kernel driver inside the same host is
not recommended at all ...

Personally I run storage node and compute node on the same physical
hosts, but the OSD is isolated into a DomU to avoid the possible
'paging / memory' issue of running rbd.ko and osd on the same host.
(here they have pinned cpu and memory, so no interactions).

Alternatively you could give the xen blktap rbd userspace driver a shot.

Cheers,

   Sylvain
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