Re: [Xen-users] HVM domU on storage driver domain

[Kuba <kuba.0000@xxxxx>]

W dniu 2017-01-16 o 17:06, G.R. pisze:
> Hi all,
> I'm trying out the storage driver domain feature
Hi

A while ago, with a great deal of help from Roger Pau Monné, I managed 
to use FreeBSD domU as storage driver domain to provide storage for 
other domUs.
The main difference is that it didn't require any network-based protocol 
(iSCSI etc.) between the domains.
Typically your domU's frontend driver is connected to a block device 
inside dom0 via dom0's backend driver. But Xen has the ability to 
connect your domU's frontend driver directly to the backend driver of 
another domU. In short, you can create a storage driver domain, create a 
block device inside it (e.g. a zvol) and than create another domU using 
this block device directly, just as if it was provided by dom0.
Here you can find the steps that should get you started. It was a while 
ago and required to apply a patch to Xen; I don't know what's its status 
right now, but since FreeNAS is based on FreeBSD, it might be worth to 
take a look:
https://lists.xenproject.org/archives/html/xen-users/2014-08/msg00003.html

Some time later I managed to set up a "true" storage driver domain using 
PCI passthrough to assign SATA controller directly to the driver domain 
and used that domain to provide storage for Windows-based guests. It 
worked flawlessly. I believe this idea might be interesting to you too.
Regards,
Kuba

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