SAP Installation Types

SAP Installation Types
We have following way to install sap systems

01. Single system Installation 

In this type of installation sap application server and database are installed on one system.

The advantages of this type of centralized installation compared to a distributed one are as follows:

• Less management load for installing and administering the system
• Less hardware maintenance
• Less network load

The disadvantages of this type of centralized installation compared to a distributed one are as follows: 

• No possibility to distribute SAP services. They all reside on the same central server. 
• Performance degradation because the CPU has to share its resources among database services and SAP work processes. 
• Less availability if the server goes down, everything goes down. 

We use this type of install on following :

• In SAP training system
• In SAP quality system
• In SAP development system

02. Distributed System

In this type of installation sap application server(s) and database are installed on different system and we use multiple sap application server to logon.  

The advantages of this type of  installation compared to a centralized one are as follows:

• Possibility to distribute SAP services. They all reside on the different distributed server. 
• Performance upgrade because the CPU has not to share its resources among database services and SAP work processes.

 The advantages of this type of installation compared to a centralized one are as follows:

• More management load for installing and administering the system
• More hardware maintenance
• More network load
• Less availability if the database server goes down, everything goes down.

Sap Thumb Rule:-

We have to install DB Server from where we have install Center Instance (CI) server. 

Dialog Work Process parallel connected to V1 (online) and V2 (offline) work process.

Sap require 2-4 kbps per user band width other ERP require 12 to 16 kbps.  
03. High Availability System

In this type of installation sap application server and database are installed on high availability cluster system.

The aim of a High Availability Cluster (HAC) is to provide the availability of specific services within a system landscape. This is reached by reducing downtime using redundant cluster nodes. A common HAC setup consists of two cluster nodes, which is the minimum for redundancy. If one server node crashes, the second node takes over the clustered services and secures the availability this way. This is also called a "two-node cluster" or a "failover cluster." According to the demands of availability, the number of server nodes can be increased to minimize the risks of failure of a node.