System aggregation

ScaleMP apparently has a facility where a single system image can be
spread over multiple host computers, possibly with guest
paravirtualisation, although the non-priced variant only supports memory
aggregation. http://www.scalemp.com/products/product-comparison/

There also used to be something called Virtual Iron (possibly based on
Xen), but it was swallowed by Oracle where it was under the wing of Wim
Coekaerts who I believe has just joined Microsoft.

Has anybody ever experimented with PostgreSQL on this sort of thing, and
is anybody aware of an open equivalent?

--
Mark Morgan Lloyd
markMLl .AT. telemetry.co .DOT. uk

[Opinions above are the author's, not those of his employers or colleagues]