When restarting an Additional Application Server (AAS) instance, the system evaluates the following profiles in the following order:
The default profile, which contains global parameters that apply to all instances of the SAP system. The default profile is located in the /usr/sap/<SID>/SYS/profile directory of the central instance host.
The instance profile of the AAS instance, which contains instance-specific parameters that override the default profile. The instance profile is located in the /usr/sap/<SID>/SYS/profile directory of the AAS instance host. The instance profile of the Primary Application Server (PAS) and the instance profile of the Central Services (CS) instance are not relevant for the AAS instance, as they contain parameters that apply only to their respective instances. Reference: [SAPTEC], Unit 3: SAP System Architecture, Lesson: SAP System Configuration, Slide 8-10; [ADM100], Unit 3: SAP System Architecture, Lesson: SAP System Configuration, Slide 8-10.