Problem:

The MFA installation mentions these MFA Servers: MFA MFAS MFAAS. What are they used for?

Resolution:

The Mainframe Access Server has several components on the z/OS host.

MFA is the standard server for Drag & Drop, Compare and Synchronization Monitor, and Source Connect.

MFAS is the auxiliary server for Data Connect.  

MFAAS is the auxiliary server for Endevor or Changeman.