Installation guide

To ensure that the (A)SCS "follows" the ERS instance, the follow-service dependency was

implemented in RHCS.

The SAP System Mount Directory should be exported by a highly available NFS server and

mounted by the cluster software.

1.6 Cluster Technology Overview

For applications that require maximum system uptime, a Red Hat Enterprise Linux cluster

with RHCS is the solution. Specifically designed for Red Hat Enterprise Linux, RHCS provides

two distinct types of clustering:

 Application/Service Failover - Create n-node server clusters for failover of key

applications and services

 IP Load Balancing - Load balance incoming IP network requests across a farm of

servers

With RHCS, applications can be deployed in HA configurations so that they are always

operational, bringing "scale-out" capabilities to Enterprise Linux deployments.

RHCS provides a complete, ready-to-use failover solution for SAP NetWeaver.

2 Testbed Environment

This section provides information about the hardware and software used to build the highly

available SAP system.

Operating System:

 Red Hat Enterprise Linux 5.3 including:

 Latest updates via Red Hat Network (RHN) subscription to channel(s):

 Red Hat Enterprise Linux

 Resolutions to the following Bugzilla issues:

 475828

 481762

 485026

Cluster Software:

 RHCS 5.3 including:

 Latest updates via RHN subscriptions to channel(s):

 RHEL Clustering

 RHEL Cluster-Storage

 Open-Sharedroot 4.4 with latest available patches

Hardware: