We can install SAP R/3 only on server operating systems. I am using windows server 2003 to explain the installation of SAP system on a desktop, laptop or on a server hardware. We have to go through following steps to complete the SAP installation successfully. They are
- Operating system
- Central Instance
- Database Instance
- SAP GUI
- Post Installation Steps
Operating system: We have to install any server operating system on a desktop, laptop or a server computer to install SAP. In real time environments we will use only the server hardware to install any SAP product. There is no need to install SAP GUI on a server computer to access the SAP system in real-time environment. We will use normally a SAPGUI program in a user computer to access the SAP server. But, Most of the students who learns any SAP module installs SAP system on their desktop or laptop computer and also installs SAP GUI on the same computer to access the SAP systems. This installation will be useful for practice at home or office before entering into the real-time environment to work on live SAP systems. I have installed windows server 2003 operating system on my desktop to practice basis administration.
Windows server operating system also can be installed on a windows vista or windows 7 host operating systems using VMware software. VMware is a virtual software which will enable us to install any number of operating systems on an existing host operating system. We can operate all the operating systems which are installed through VMware can be accessed simultaneously. To install SAP in existing host operating system, we need more RAM and Hard Disk space. We need at least 500 GB HDD and 4 GB RAM to install latest Application server of SAP (ECC 6.0). The performance of the system will be little bit slow when compare with direct installation.
We also can install SAP software by installing windows server operating system as dual boot with existing windows vista or windows 7 operating system. We should have more Hard disk space (approx. 500 GB) to install SAP in this way. We also need SATA drivers to install Windows server 2003 in some laptops. So be careful in installing SAP in this way.
Sizing: We have to analyze and plan the computing power, physical space of server and network infrastructure before starting any type of SAP installation. To install in home desktop PCs, we have to check the CPU power, Hard Disk Space and RAM. To install in Real time environments we have to consider many factors like number of users and R/3 business modules they work on, how large the database will be, and what processing power or availability required to meet the system requirements.
Network: The server or desktop computer should be connected in a live network to install SAP. We can use Microsoft Loopback Adapter to install SAP in a stand alone computers. In real-time environments most of the servers will be connected in existing network, so that there is no need to use Microsoft Loopback adapter.
J2SDK: We have install J2sdk software on the server to enable all the SAP screens which are developed using Java software development kit. We also should set the path of JAVA_HOME in system variables and bin path of the j2sdk in user variables using system environment variables. The java will not work until unless we set these paths.
RDBMS: A dummy structure of RDBMS (Oracle, MSSQL, MaxDB or DB2) is required to store the database of SAP software. All the modules will be installed when there is a Database software exists on the server. I will use oracle or MSSQL mostly to install SAP systems on my desktop to practice sap basis.
Central Instance: We have to install central instance after completion of above steps. The central instance is the first piece of software that the installation utility creates and configures. It will create the SAP directory structure and set of services of all available types such as dialog, background, update, spool, enque, message server and gateway server.
Database Instance: We have to install database instance after completion of central instance. This is the process of installing the underlying R/3 database program and creating the run-time and directory structure of the database according to user inputs. In this step all the SAP data will be loaded into the database and will be available for access by SAP users from SAP GUI.
SAPGUI Installation: After completion of all steps mentioned above we have to install and configure SAP GUI to access a SAP system. We have to start the SAP system every time we want to access it. The microsoft management console will be installed automatically when we install a central instance. We use this Microsoft Management console to start or stop SAP system. We can’t access SAP system without starting it.
Post Installation Steps: There are lot many steps to do after completion of Installation of SAP system. I am not mentioning all the post installation steps here. We have to know about at least the default users which are used to login first time into the SAP system. The default uses are ddic and sap*. The passwords of these users are the same as the password we will select during the installation of central instance. We have to use 000 client for first login.
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