RE: [Xen-users] Host and guest architecture compatibility

["James Harper" <james.harper@xxxxxxxxxxxxxxxx>]

> 
> Hi Fajar,
> 
> I *must* work with the latest version of SL 4.x (presently 4.7), I
> cannot avoid it. This is due to grid middleware requisites and
> technical support, otherwise I'm on my own to put grid services
> working.
> 
> So if I understood correctly from your post, a i386 domU running one
of
> the latest RHEL like kernels, works fine on top of a x86_64 dom0.
Thus,
> SL47 i386 domU will not probably run !!
> 
> Since I'm not at all proficient on kernel business, in order to avoid
> further problems probably I should stick to a i386 dom0.

The backend and frontend structures are incompatible between 32 and 64
bit modes for block devices (eg disk). Later versions of xen (3.1?)
publish a variable in xenstore to work out what mode structures to use
and they use that version of the structure to communicate with.

I know this because I had to fudge a workaround in gplpv :)

> 
> My idea was to have these new servers running x86_64 on dom0, in case
> I'll need it in the future.
> 

I think you can use a 32 bit Dom0 on a 64 bit hypervisor without any
problems, which pretty much gives you the best of both worlds.

James


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