The following abbreviations are used throughout this documentation:

Abbreviation
Meaning
AS SAP Application Server. Although AS typically refers to any application server, within the context of this document, it is intended to mean a non-CI, redundant application server. Thus, the application server is not required for protection by LifeKeeper.
ASCS ABAP SAP Central Services Instance. This is the SAP instance that contains the Message and Enqueue services for the NetWeaver ABAP environment. This instance is a single point of failure and must be protected by LifeKeeper.
(ASCS) The backup ABAP SAP Central Services Instance server. This is the server that hosts the ASCS when the primary ASCS server fails.
DB The SAP Database instance. This database may be Oracle or any other database supported by SAP. This instance is a single point of failure and must be protected by LifeKeeper. Note that the CI and DB may be located on the same server or different servers. DB is also used to denote the Primary DB Server.
(DB) The backup Database server. This is the server that hosts the DB when the primary DB server fails. Note that a single server might be a backup for both the Database and Central Instance.
ENSAv1 Standalone Enqueue Server Version 1. This is the version of the enqueue server available in SAP kernel versions prior to 7.51.
ENSAv2 Standalone Enqueue Server Version 2. This version of the enqueue server is available in SAP kernel versions 7.51 and later.
ERS Enqueue Replication Server.
ERSv1 Enqueue Replication Server Version 1. This is the version of the enqueue replication server available in SAP kernel versions prior to 7.51.
ERSv2 Enqueue Replication Server Version 2. This version of the enqueue replication server is available in SAP kernel versions 7.51 and later.
HA Highly Available; High Availability.
ID or <ID> Two digit numerical identifier for an SAP instance.
<INST> Directory for an SAP instance whose name is derived from the services included in the instance and the instance number, for example a CI <INST> might be DVEBMGS00.
PAS Primary Application Server Instance.
SAP Instance A group of processes that are started and stopped at the same time.
SAP System A group of SAP Instances.
<sapmnt> SAP home directory which is /sapmnt by default but may be changed by the user during installation.
SCS SAP Central Services Instance. This is the SAP instance that contains the Message and Enqueue services for the NetWeaver Java environment. This instance is a single point of failure and must be protected by LifeKeeper.
(SCS) The backup SAP Central Services Instance server. This is the server that hosts the SCS when the primary SCS server fails.
SID or <SID> System ID.
sid or <sid> Lower case version of SID.
SPOF Single Point of Failure.

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