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Comment: Removed ref to z/OS

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In certain types of application environments, a large number of nodes can be spawned dynamically and live for a relatively brief period of time. For example, with WebSphere on z/OS IBM Mainframes, a dynamic workload manager can spawn transient JVMs for an existing application server (called a servant) based on application load or other policies. The spawned JVMs are identical, but each has a different process ID. Similarly, in dynamic hosted environments such as AWS, Rackspace, and others, nodes can be brought up and taken down frequently.  

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