RE: [Xen-users] XEN hypervisor on USB disk

[Jan ÄeÅÄut <Jan.Cescut@xxxxxx>]

Hm, what about running a stubdom? Stubdom relieves dom0 of I/O operations that 
HVM domain with qemu in userspace imposes. Can it be related somehow to a PV 
domain with IOMMU enabled?

Thanks,
Jan

-----Original Message-----
From: Fajar A. Nugraha [mailto:fajar@xxxxxxxxx]
Sent: 11. maj 2010 5:45
To: Jan ÄeÅÄut
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] XEN hypervisor on USB disk

On Mon, May 10, 2010 at 7:29 PM, Jan ÄeÅÄut <Jan.Cescut@xxxxxx> wrote:
> If I passthrough the disk controller to DomU (running FreeNAS) and then try 
> to share the iSCSI LUNs over virtual network to other DomUs that are running 
> in paravirtual mode, the performance penalty shouldn't be a concern - baised 
> on different I/O benchmarks that I checked on internet (between two HVM 
> guests with installed Xen network drivers and between two PV guests - which 
> performed excellent). I would also like to run a single HVM guest (Windows 
> 2003) which will have it's LUNs shared over dedicated network card that will 
> be passed-through (one in FreeNAS and the other in HVM guest Win2003).
> Of course if I'm not mistaken. :)

AFAIK there was a discussion about whether to run iscsi client on dom0
and domU, when the storage server was an external host. The conclusion
was running it in dom0 and exporting it to domU as block device was
faster than importing it on domU directly. So there's somewhat
significant penalty in running iscsi on domU.

Then again, if you can live with the penalty, you should be just fine.
Make sure to run tests first :D

--
Fajar

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