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Re: [Xen-devel] Any plan to support disk driver domain?

On 04/04/2013 06:26 AM, G.R. wrote:
Hi developers,
I'm currently running a PVHVM freeNAS domU to serve storage (SATA
controller passed-through) to all other domUs. However, some issues are
observed in the network / NFS performance for the NAS domU.
I noticed that there is a blkback driver in freebsd which is documented as
capable to export disk to other domains, which looks very promising.
However, the wiki says that disk driver domain is not supported (at least
for now).

I wonder if there is any plan to support such disk driver domain? It'll be
a great feature for my use case.


I have submitted a patch adding libxl support for block backend domains - the
latest version is:


This has been tested with Linux in-kernel blkback; you just have to disable 
own hotplug execution option and the default (Linux) hotplug scripts will 
the device. I assume freebsd support can be done similarly, although perhaps it
requires a helper in the domU?

Daniel De Graaf
National Security Agency

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