11g in virtual environment

Good day to all,
I have certain questions regarding Oracle 11g working under virtual environment, and any information in this regard is most welcome.
We are planning to migrate multiple existing databases(say 9i, 8i, 10g) on one bigger server with sufficient RAM, CPU and other resources.
We are planning to migrate all the above databases on 11g and use some virtual environment software to install multiple 11g databases on that server.
I think the migration should not be a big issue as we will use simple export and import.
My questions and doubts in this regard are as follows
(1) Is it practical to run production databases in virtual environment
(2) Is 11g is mature enough to be used in such environment(or 10g r2 will be better option)
(3) If one runs multiple databases or instances in virtual environment, how the Kernel setting of one database will effect the other one as I have heard that these virtual software’s( for example VMware) shares some common files for system resource.
(4) Which OS will be a better option in such scenario(HP UX, SUN Solaris, Windows....)
(5) If any one is working in such scenario can suggest his or her own experience.
(6) Any other suggestion will be appreciated.
Regards
Ans

(1) Is it practical to run production databases in virtual environment Yes
(2) Is 11g is mature enough to be used in such environment(or 10g r2 will be better option) Yes. Infact, there are some really good features of 11g that you may want to consider. Deciding 10g or 11g, depends on the type of databases are in hand. It would be better if you'd do some testing on both environments to come to a better conclusion.
(3) If one runs multiple databases or instances in virtual environment, how the Kernel setting of one database will effect the other one as I have heard that these virtual softwareâ€™s( for example VMware) shares some common files for system resource.
http://download.oracle.com/docs/cd/E11081_01/doc/doc.21/e10901/resources.htm#CJADCIHE
http://download.oracle.com/docs/cd/E11081_01/doc/doc.21/e10898/ha.htm#insertedID1
(4) Which OS will be a better option in such scenario(HP UX, SUN Solaris, Windows....) Depends on lot of things. If you use Oracle 11g, you may want to conseder Oracle VM with Oracle Unbreakable Linux/Oracle Enterprise Linux
Hope it helps.
Regards,
Z.K.

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(2) Is 11g is mature enough to be used in such environment(or 10g r2 will be better option) Yes. Infact, there are some really good features of 11g that you may want to consider. Deciding 10g or 11g, depends on the type of databases are in hand. It would be better if you'd do some testing on both environments to come to a better conclusion.
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http://download.oracle.com/docs/cd/E11081_01/doc/doc.21/e10901/resources.htm#CJADCIHE
http://download.oracle.com/docs/cd/E11081_01/doc/doc.21/e10898/ha.htm#insertedID1
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Where 2 virtual CPUs can run only on physical core 0, how many Oracle 11g Enterprise licenses do I require?1 license.
Where 2 virtual CPUs can run on 2 physical cores 0, 1, how many Oracle 11g Enterprise licenses do I require?2 licenses.
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