Managing Serviceguard Extension for SAP, December 2007

Step-by-Step Cluster Conversion
SAP Preparation
Chapter 3 91
The virtualized installation for SAP Netweaver 2004s is completed, but
the failover is not working yet. There might be SAP and Oracle daemon
processes running (sapstartsrv and ocssd) for each SAP and database
instance.
The instances are now able to run on the installation host, once the
corresponding Serviceguard packages got started. It is not yet possible to
move instances to other nodes, monitor the instances or trigger
automated failovers. Don’t shut down the Serviceguard packages while
the instances are running.
Netweaver 2004 Java-only High Availability Option
This section describes the installation of a Java-only based Application
Server 6.40 as provided as part of Netweaver 2004SR1. A SAP
application relying on a Java-only Application Server 6.40 is SAP
Enterprise Portal 6.0. This component debuts the virtualized installation
with SAPINST that is generally used for Netweaver 2004s, but this early
procedure differs in many details from the final process.
In a landscape for a SAP Web Application Server (WAS) 6.40 Java the
following components exist:
• Java System Central Services (SCS) [Java Message and Enqueue
Server]
• Java Central Instance (JC) [Java Dispatcher(s), Server(s), Software
Deployment Manager (SDM)]
• Java Dialog Instance(s) (JD) [Java Dispatcher(s), Server(s)]
• Database Instance (DB)
The potential SPOFs are the SCS and DB instances. The Java Central
instance needs to be installed locally on one server. Dialog instances can
be installed redundantly on nodes inside or outside the cluster.
As preparation, simple Serviceguard packages for the clustered
instances can be created. They provide the virtual IP addresses that are
specified during installation. The package(s) will later on be altered to
become SGeSAP packages. It will be more convenient to configure
SGeSAP once the SAP installation has taken place. The following steps
are performed as root user to prepare the cluster for the SAP
installation.