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Distribution and Consistency Services (DCS) provide the underlying group services framework for the HAManager such that each appserver process knows the healthiness and status of JVMs and singleton services. It basically provides view synchronous services to the HAManager. DCS itself uses RMM as its reliable pub/sub message framework. RMM is an ultra high speed publish/subscribe system that WebSphere uses internally for its core group communication fabric as well as for DRS traffic.
