I have not done an extensive comparison between using Linux on ZSeries and
using UML, but from the experiments I have done with e.g. AFS, one thing
stands out very clearly: Linux on zSeries (under VM) provides you with a whole
range of resource management tools that are not available under UML. In fact,
you do not have much control over resources when using UML, other than the
standard Unix process priority/nice values for scheduling. Nothing that comes
even close to the extensive facilities VM provides.
The lack of any decent resource management for virtual instances using UML is
the single most problem I see with using UML for consolidation. Nor do I
believe that UML is intended to be used for consolidation purposes. Rather it
is a good development tool for kernel-level code, and it provides a very nice
isolated environment where experimenting on a physical box would be more
expensive (in time and effort).
Kris
On Thu, Sep 25, 2003 at 06:09:34PM +0200, Fabrice Vallet wrote:
> Hi list,
>
> We have plan to implement Linux on zSeries ...
>
> For me there is no doubt about the solution but some people who works on
> Linux Intel platform want to use UML instead ...
>
> I'm a mainframer and i don't now anything about UML ...
>
> Do you know the Pros and Cons ...
>
> Regards,
>
> Vallet Fabrice
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