What I'm not sure of:
- Maybe it's better to run PGSQL in Dom0, on 2 different Xen units that
are beefed up, with a few lighter DomU guest OSs running in the
background. Some sort of heartbeat software that allows the 2 Xen units
to grab the PGSQL's IP address as needed.
PostgreSQL performs very, very well on Xen even in DomU. It is one of
the things that lends to the Xen credibility because they use us in
their benchmarks.
- Performance of PGSQL in a DomU. What are the gotchas? Do we need to
export PCI NICs to the PGSQL DomU?
You will take about a 5% hit over Dom0.
Sincerely,
Joshua D. Drake
(I have a lot of freedom to experiment. As long as services are up and
running and things are stable... We're going from individual machine
with DAS to a more clustered/virtual environment with SAN.)
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