High availabilty in OEM11g

Hi
Regading OEM grid control 11g in standalone server.
What is the easiest/best way to have high availability ?
i.e
I can replicate repository database with dataguard
How about oms?

You dont need a cluster. You can install an additional OMS pointing to the same repository to have an active-active configuration. Here two or more OMS instances are configured to serve the same application workload. These instances can reside on the same machine as the Repository Database machine(s) or on different machines.
They are all active instances front-ended by a Server Load Balancer (SLB) router, which can redirect requests to any of the active OMS instances. Such a setup ensures that even if one of the OMS goes down, another OMS can serve the console / upload requests.
For more details, refer to the doc link suggested by Loc earlier:
http://docs.oracle.com/cd/E11857_01/em.111/e16790/ha_multi_resource.htm#BABIECFI
Also see:
Note 330072.1 - How To Configure Enterprise Manager for High Availability

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Hi misecmisc
please gone through this links i hope it will help you.
https://wiki.sdn.sap.com/wiki/display/JSTSG/%28JSTSG%29%28TG%29Q2065
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High availabilty in OEM11g

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