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Yep, it's happening in the wild. In 10g, Oracle CRS is *required* but it can
be used along with third party clusterware as well. The migration procedures
are outlined and the DBUA in 10g will migrate a 9i RAC environment to a 10g
RAC environment (a valuable new feature).
I'm the IOUG RAC SIG's event chairperson, so if you haven't heard of the RAC
SIG, I'd encourage you to check it out. Go to http://www.oracleracsig.org/
and you'll see a forum area along with other interesting events, like RAC topic
web seminars presented by Oracle and non-Oracle experts. If you're an IOUG
member, you can also join the IOUG RAC SIG mailing list server.
RAC environments are complex, so it's especially important to do at least one
test upgrade on a non-production environment to practice the procedures as
well as test your application on the new release (to flush out any performance
changes due to optimizer plan changes, etc.).
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