Managing Serviceguard Extension for SAP Version B.05.10, December 2012

Contents
1 Overview..................................................................................................6
About this Manual....................................................................................................................6
Related Documentation..............................................................................................................6
2 Designing SGeSAP Cluster Scenarios............................................................8
General Concepts of SGeSAP....................................................................................................8
Configuration Restrictions.........................................................................................................10
Mutual Failover Scenarios Using the Two Package Concept..........................................................10
Robust Failover Using the One Package Concept........................................................................12
Follow-and-Push Clusters with Replicated Enqueue.......................................................................13
Dedicated NFS Packages.........................................................................................................14
Dialog Instance Clusters as Simple Tool for Adaptive Enterprises...................................................15
Handling of Redundant Dialog Instances...................................................................................16
Dedicated Failover Host..........................................................................................................17
3 SGeSAP Cluster Administration...................................................................19
Performing standard tasks in System Management Homepage......................................................19
Performing standard tasks with SAP's startup framework...............................................................21
Change Management.............................................................................................................23
System Level Changes.........................................................................................................23
SAP Software Changes.......................................................................................................25
Ongoing verification of package failover capabilities..................................................................26
Upgrading SAP Software.........................................................................................................27
Package Conversion................................................................................................................27
Mixed Clusters.......................................................................................................................27
4 Planning the Storage Layout.......................................................................30
SAP Instance Storage Considerations........................................................................................30
Option 1: SGeSAP NFS Cluster............................................................................................31
Common Directories that are Kept Local...........................................................................31
Directories that Reside on Shared Disks............................................................................32
Option 2: SGeSAP NFS Idle Standby Cluster.........................................................................33
Common Directories that are Kept Local...........................................................................34
Directories that Reside on Shared Disks............................................................................34
Option 3: SGeSAP CFS Cluster............................................................................................35
Common Directories that are Kept Local...........................................................................35
Directories that Reside on CFS.........................................................................................36
Database Instance Storage Considerations.................................................................................36
Oracle Single Instance RDBMS............................................................................................37
Oracle databases in SGeSAP NFS and NFS Idle Standby Clusters.......................................37
Oracle Real Application Clusters..........................................................................................38
MaxDB Storage Considerations...........................................................................................39
DB2 Storage Considerations...............................................................................................42
ASE Storage Considerations................................................................................................42
5 Step-by-Step Cluster Conversion..................................................................44
SAP Preparation.....................................................................................................................46
SAP Pre-Installation Considerations.......................................................................................46
SAP Netweaver High Availability....................................................................................46
SAP Web Dispatcher High Availability ................................................................................50
SAP Gateway High Availability...........................................................................................50
Replicated Enqueue Conversion...........................................................................................50
Splitting an ABAP Central Instance..................................................................................51
Contents 3