Managing Serviceguard Extension for SAP on Integrity Linux, December 2005

Understanding Serviceguard Extension for SAP on Integrity Linux
Overview of SGeSAP on Integrity Linux
Chapter 1 13
If either node1 or node2 fails, the package can fail over to node3. If a
failover to a node that is not idle takes place (for example if node3 were
used as an application server), SGeSAP/LX IPF, if requested, can bring
down running instances to free the resources needed to get the system
up.
Figure 1-2 Two-Package Failover Scenario with Third Node as Standby
Serviceguard for Linux Cluster
DB and CI in two packages
Shared
Disk
node1
node2
node3
Application Servers
DB
Pkg
DB
Pkg
CI
Pkg
DB moved
to another
node in the
event of a
failure
CI moved
to another
node in the
event of a
failure