Managing Serviceguard Extension for SAP on Linux (IA64 Integrity and x86_64), April 2009

Table of Contents
Printing History...........................................................................................11
About this Manual.................................................................................................................................11
1 Understanding Serviceguard Extension for SAP on Linux................................13
Designing Serviceguard Extension for SAP on Linux Cluster Scenarios..........................................................13
Failover Scenarios Using One and Two Package Concepts....................................................................14
Robust Failover Using the One Package Concept..................................................................................15
About SAP Client/Server Architecture......................................................................................................16
About Two-Tier Configurations...........................................................................................................17
About Three-Tier Configurations....................................................................................................18
About SAP Three-Tier Dual-Stack Client Configurations................................................................19
Clustering Stand-Alone J2EE Components.................................................................................................20
Highly Available (HA) NFS................................................................................................................20
Dialog Instance Clusters as Simple Tool for Adaptive Enterprises............................................................20
Handling of Redundant Dialog Instances.......................................................................................22
Enqueue Replication..............................................................................................................................22
Enqueue Replication for a Dual-Stack Configuration..............................................................................23
Serviceguard Extension for SAP on Linux File Structure..........................................................................25
Serviceguard and SGeSAP/LX Specific Package Files......................................................................25
Package Directory Content for the One-Package Model..............................................................26
Package Directory Content for the Two-Package Model...............................................................27
2 Planning a File System Layout for SAP in a Serviceguard/LX Cluster
Environment................................................................................................29
Overview.............................................................................................................................................29
About SAP Configuration Environments....................................................................................................29
About SAP Components.........................................................................................................................30
About Impacted File Systems...................................................................................................................31
About Storage Options.....................................................................................................................32
LOCAL Storage..........................................................................................................................32
SHARED Storage........................................................................................................................32
"LOCAL mount" or "SHARED mount"............................................................................................32
LOCAL mount........................................................................................................................33
SHARED NFS or SHARED EXCLUSIVE............................................................................................33
SHARED NFS........................................................................................................................33
SHARED EXCLUSIVE..............................................................................................................33
Configuration Scenarios.........................................................................................................................34
One ABAP CI and one DB................................................................................................................34
SAP Instance..............................................................................................................................34
DB Instance...............................................................................................................................34
One ABAP CI, one ABAP DI and one DB............................................................................................35
SAP Instance..............................................................................................................................35
DB Instance...............................................................................................................................35
Two ABAP DI's and one ABAP SCS and one DB..................................................................................36
SAP Instance..............................................................................................................................36
DB Instance...............................................................................................................................36
Two ABAP DI's, one ABAP SCS, one JAVA CI, one JAVA SCS, and one DB..............................................36
SAP Instance..............................................................................................................................36
DB Instance...............................................................................................................................36
Two ABAP DI's, one ABAP SCS, one JAVA CI, one JAVA SCS, one JAVA REP, and one DB.........................37
SAP Instance..............................................................................................................................37
DB Instance...............................................................................................................................37
Putting it all Together.............................................................................................................................37
Table of Contents 3