HA Configuration Approach

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1 HA Configuration Approach Key Factors H/W or Services failure Identify single points of failure (SPOFs) SPOFs in a standard SAP System Database Enqueue Service Message Service Solutions Protect the vulnerable services (SPOFs) Cluster Technology Switchover software for High Availability Replicated Enqueue Server CCMS Comprehensive monitoring and management Utilities like lgtst, rfcping, sapinfo, ensmon helps to monitor the vulnerable services Implement recovery procedures 0

2 HA Configuration Option 1 Node A MSCS Cluster Node B Legend: ABAP Central System Services, Java Central System Services Replicated Enqueue Server Dialog Instance Add-In CI Application Server 1

3 HA Configuration Option 1 2 Node MSCS Cluster Active-Passive Cluster Configure 3 cluster groups ABAP Central System + Replicated Enqueue Server Java Central System + Replicated Enqueue Server Database s will run on the passive node Install at least 2 Dialog/Add-In CI instances for each ABAP & Java Central Systems outside of cluster Configure load balancing between Dialog Instances, Dec Notes: Central System Service is a combination of Standalone Enqueue Service & Message Service Replicated Enqueue Server Dialog Instance Add-In CI Central Instance Add-In 2

4 HA Configuration Option 2 Node A MSCS Cluster Node B Legend: ABAP Central System Services, Java Central System Services Replicated Enqueue Server Dialog Instance Add-In CI Application Server 3

5 HA Configuration Option 2 2 Node MSCS Cluster Active-Active Cluster Configure 3 cluster groups ABAP Central System + Replicated Enqueue Server Java Central System + Replicated Enqueue Server Database s will run on the passive node Install at least 2 Dialog/Add-In CI instances for each ABAP & Java Central Systems outside of cluster Configure load balancing between Dialog Instances 4

6 HA Configuration Option 3 MSCS Cluster 1 Node A Node B Database Database Node A MSCS Cluster 2 Node B Legend: ABAP Central System Services, Java Central System Services Replicated Enqueue Server Dialog Instance Add-In CI Application Server 5

7 HA Configuration Option 3 2 MSCS Clusters with 2 Nodes each Active-Passive Cluster Configure 2 cluster groups in MSCS Cluster 1 ABAP Central System + Replicated Enqueue Server Java Central System + Replicated Enqueue Server Configure 1 cluster group in MSCS Cluster 2 Database s will run on the passive node Install at least 2 Dialog/Add-In CI instances for each ABAP & Java Central Systems outside of cluster Configure load balancing between Dialog Instances 6

8 HA Configuration Option 4 MSCS Cluster 1 Node A Node B Database Database MSCS Cluster 2 Node A Node B Legend: ABAP Central System Services, Java Central System Services Replicated Enqueue Server Dialog Instance Add-In CI Application Server 7

9 HA Configuration Option 4 2 MSCS Clusters with 2 Nodes each Active-Active Cluster Configure 2 cluster groups in MSCS Cluster 1 ABAP Central System + Replicated Enqueue Server Java Central System + Replicated Enqueue Server Configure 1 cluster group in MSCS Cluster 2 Database s will run on the passive node Install /Add-In CI on Node B Install at least 2 Dialog/Add-In CI instances for each ABAP & Java Central Systems outside of cluster Configure load balancing between Dialog Instances 8

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