Can opscenter be made to run on a RAC.
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The Opscenter application uses the DSE Driver to talk to the cluster. The driver has load balancing algorithms built into it to do just that. Matter of fact, that's one of the value propositions of the entire DSE/Cassandra architecture is to provide high-availability, fault tolerance and no single point of failure to your application and the database. When you build an application on top of DSE/Cassandra using the DSE drivers your application will have those same highly available, fault tolerant, automated failover and fail back as well as load balancing across the cluster. Furthermore, the architecture supports the ability where if a node fails the data is still highly available and consistent. Nodes can come and go and your data will still be available. This is an Active-Active architecture that allows you to support the same application running in multiple regional datacenters where you application can failover from one DC to another and still maintain state.
Opscenter is a monitoring and management console application written on top of Cassandra so it can run colocated with your environment or be offloaded to a dedicated DSE Cluster to manage multiple clusters while offloading the impact to application clusters. The intent is also to reduce Oracle across the datacenter for applications that don't need it. So, to answer your question, you can offload the impact of Opscenter to it's own cluster, but not to Oracle RAC.
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