Note: You must shut down and restart the server for this setting to take effect.
There is no hard limit on the number of replicator tasks that a server can run. The only limit is one of system resources--most importantly, the amount of RAM. The Notes/Domino server should be able to add replicator tasks until the available RAM runs out. It is believed that the maximum number of replicator tasks tested is 20.
By default only one replicator task is loaded by the server. You can load more by using the LOAD REPLICA console command OR by adding Replicators=n in the notes.ini.