What dispatch priority in zOS environments should the
Broker and Security run at in relation to Adabas?
What priority in relation to the broker should we run the batch RPC Servers?
Broker and Security should run at about the priority of Adabas. Batch RPC Servers should run below Broker/Adabas in priority, but above general batch. If the RPC Servers are servicing online (web) users, they should run closer to the priority of your online TP monitors since they are performing a similar function.
If you are using RACF for Security, you will probably want to RACLIST the Broker SAF class.