Managing Serviceguard Extension for SAP, December 2007

Understanding Serviceguard Extension for SAP
Combining SGeSAP with Complementary Solutions
Chapter 1 43
While important application components are on the shared storage pool,
the definition for the shared devices, as well as the configuration of the
relocatable IP address have to be maintained manually on each node
capable of running this application.
Each installation of SAP application has many dependencies on the
configuration of a hosting operating system. The bullet list shows
example items that must be consistent between nodes to allow failover:
• Directory and File Structures
•Symbolic Links
• Kernel Parameter
• Permissions
• NFS Configurations
• Processes
• Traces and log files
• Shared Memory Segments
• Security Settings
• Resource Consumption
• User Configurations
• Spool Configurations
NOTE Any difference in resource configurations between nodes in a cluster may
cause problems to an application upon a fail over. These problems may
appear immediately after a switch and may disable the start of the
application but may also appear only in certain situations during the
operation of an application.