Difference btw: Distributed, High-Availability and Additional SAP System Instances

Hello,
In the installation Doc for NW 741, there is 3 other installations scenarios beside the single instance, can you pl. highlight the difference?
Cheers,
F

Hello Fouad,
Distributed landscape:
In distributed landscape, every instance can run on a separate host
- Central services instance for ABAP ( ASCS)
- Enqueue replication server instance (ERS instance ) for ASCS instance
- Database instance
- Primary application server instance (PAS)
High availability :
In high availability ,all above instances can run on seperate host. Here you can run all instance in switchover cluster infrastructure. That means ,for any instance if one node in cluster fails ,it switch over to other other node and still operations can run without any distrubance.
Additional SAP instance:
Additional SAP aaplication instance can be installed to scale the performance of an SAP system. It can be installed on one of the above instance host or on differnt host.
The term "additional application server instance "was introduced to replace term dialog instance from SAP Netweaver 7.1 and higher.
For more and detailed information ,you can refer to Installation guide for the SAP release you are planning to install and for DB/OS combination.
Hope this helps.
Regards,
Archana

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