Home > Workload Solutions > SAP > Guides > Dell Validated Design for High Availability for SAP with Red Hat Pacemaker Clusters > Terminology
The following table provides definitions for some of the key networking terms that are used in this document:
Term | Definition |
ASCS | ABAP SAP Central Services—ASCS consists of the message server and the enqueue server. The message server acts as a communication channel between the application servers and handles the load distribution. The enqueue server controls the lock mechanism. |
ERS | Enqueue Replication Server—ERS must keep an up-to-date replica of the lock table so that the state of the table locks is safeguarded if something happens to the ASCS instance. |
NAS | Network-attached storage |
NFS | Network File System |
PAS | Primary Application Server—The application servers run the ABAP dialog instances. One PAS and several additional application servers (AAS) are required depending on the workload. |
SAN | Storage area network |
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Authors: Christian Bronk, Benjamin Simroth, James Martin, Robert Boyd
Date | Change summary |
09-06-2022 | Initial release |