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The Deployment Manager also hosts a cell naming server that controls the whole naming context structure.
Clients can bootstrap to the cell naming server using:
prop.put(Context.PROVIDER_URL, "corbaloc::dmgrhost:9809");
The Deployment Manager server is not workload managed in WebSphere V6. In addition, the naming service is not inside the Deployment Manager process. Unless you have a highly available Deployment Manager using clustering software such as IBM HACMP or TSA, you should not use it to bootstrap your application clients. A highly available Deployment Manager has the advantage of a single image of the domain.
No matter where your client bootstraps, any naming binding or update writing at cell scope fails if the Deployment Manager is not available.