Managing Serviceguard Extension for SAP on Linux (IA64 Integrity and x86_64), February 2008

Planning a File System Layout for SAP in a Serviceguard/LX Cluster Environment
About SAP Components
Chapter 246
NOTE With SAP NetWeaver 04 JAVA, the Message Server and the Enqueue
Server are separated from the central instance. These two services are
grouped within the SAP SCS (SAP Central Services) Instance as
services. From NW04s the ABAP SCS can be also separated from the
central instance.
Each stack, ABAP and JAVA, has its own message Service and enqueue
Service. For ABAP systems the SAP Central Services are referred to as
ASCS, for JAVA systems the SAP Central Services are referred to as
SCS.
The ASCS and the SCS are leveled as SPOF (Single Point of Failure) and
require a high availability setup therefore. If the ASCS is integrated
within the ABAP central instance (standard in NetWeaver 04) the
central instance of the ABAP system also needs a high availability setup.