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There will always be a virtualization overhead. The problem comes when comparing raw performance to actual usage. VMware will not match the raw power of a non virtualized server. But this comparison is only valid if you are talking a 100% utilized physical server to a 100% utilized VM. Most servers are not fully utilized. If you have an oracle server that is 50% utilized and you move it to a VM that is now 70% utilized, you haven't lost any performance.
I need your VM experience on Oracle.
I have VM and installed Linux 4 AS, for Oracle 10gR3 Grid control, but now I suffered a lot, as sometimes the database is down, sometimes listener is down, sometimes agent, sometime the other processes gone.... almost happened every day. This time is better, as the system I had before crashed twice and all data gone, it hurts.....
Mem usage hits 100% or 0% idle is very common on this box, I do not want to to say I hate VM but it did give me too much pain.
Anyone has advise to keep VM in healthier status, like how to configure the VM parameters for Oracle.
Thanks a lot.