This parameter specifies the degree of parallelism that is used for communication (both control messages and data flow) between members within a DB2® instance.
This parameter determines the number of sender and receiver fast communication manager conduit pairs. By default, an instance has only one pair: one sender and one receiver that handle all communication to and from other members in the instance.
When this configuration parameter is set to 1, no parallelism is used. Updates to this parameter take effect only after you shut down and restart all members in an instance.