[Beowulf] clustering using xen virtualized machines

Jonathan Aquilina eagles051387 at gmail.com
Wed Jan 27 04:08:25 PST 2010

gavin you mentioned costs, those are only incurred with xen if you need the
extra features such as server migration and other features. also if you dont
need those extra features couldnt you just live with the free version of

On Wed, Jan 27, 2010 at 11:42 AM, Geoff Galitz <geoff at galitz.org> wrote:

> I've had the good fortune to be in the HPC and also HA business for a few
> years (10 years for HPC but only about 4 for HA).  Given the current
> approach for virtualization I don't see that Xen or other virtualization
> technologies are good for HPC environments if the performance is a
> paramount
> concern.
> Virtualization in an HPC/HA world is mostly beneficial for portability and
> fail-over.  But the added layer for a hypervisor will be significant if
> your
> jobs run for an extended period of time.  I've seen jobs that run for
> months...  a 7% performance penalty (fairly typical in my experience) over
> the course of a month is significant.
> ---------------------------------
> Geoff Galitz
> Blankenheim NRW, Germany
> http://www.galitz.org/
> http://german-way.com/blog/
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Jonathan Aquilina
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