What is the logical system name used for in R/3?

We have a R/3 server. The production client has a logical system name. What is the logical system name used for?
Tony Tam

Hi Tony
Following Links will help you in understanding the concept
http://benstudycenter.blogspot.com/2008/02/logical-system.html
http://help.sap.com/saphelp_sm32/helpdata/en/78/217dc151ce11d189570000e829fbbd/frameset.htm
http://help.sap.com/saphelp_sm32/helpdata/en/78/217dc151ce11d189570000e829fbbd/frameset.htm
thanks
Bhudev

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You are in the right track. BD54 will show you the logical system name for all the existed systems in CUA.
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i am really digging for the solution of changing or renaming the logical system name technical name T90CLNT090.
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Pls follow this OSS note : 325525.
Note 325525 - Copying and renaming systems in a BW environment
Summary
Symptom WARNING: THIS NOTE HAS BEEN REPLACED. FOR MORE CURRENT AND MORE COMPREHENSIVE INFORMATION SEE NEW NOTE 886102.
You want to copy and or rename one or more systems (database or client copy). One or more of the systems is a BW system or is connected to a BW system.
Caution: This note only deals with problems that occur in the BW source system connections. Other problems that occur in the BW environment (indexes) are NOT dealt with. See URL http://www.service.sap.com/bw --> Services & Implementation --> System copy & Migration.
Other terms BW, source system, OLTP, database copy, client copy, system infrastructure, transport system, connections, RFC connection, trfc, transfer structure, IDoc, ALE customizing, logical system name, system changeability, renaming systems, system copy
Solution Several scenarios are possible in this environment. Find the scenario relevant to your situation below and execute the steps listed or read the note(s) specified:
Scenario 1) You do not want to copy a system but only want to rename one (changing a logical system name).
           Solution scenario 1): Execute Transaction BDLS both in the client to be renamed and in the connected BWs or BW source systems. To do this, see Notes 121163 and 369758.
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Scenario 2) You want to copy the entire system infrastructure connected by the BW source system connections (that means the entire system group) by a database copy. SAP recommends this procedure for copying systems.
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Scenario 3) You want to copy a single BW system of the group by database copy.
Scenario 3)a) You only want to exchange the hardware of your system but do not want to rename the system.
                     Solution scenario 3)a): You do not need to execute follow-up work regarding the system connections, except for adjusting the IP address in the RFC destinations of the connected system.
Scenario 3)b) You want to keep the original system of the copy so that you have two systems after copying.
                     Solution scenario 3)b): See Note 184754.
Scenario 4) You want to copy a single source system of the group by database copy.
Scenario 4)a) You only want to exchange the hardware of your system but do not want to rename the system.
                     Solution scenario 4)a): You do not need to execute follow-up work regarding the system connections, except for adjusting the IP address in the RFC destinations of the connected system.
Scenario 4)b) You want to keep the original system of the copy so that you have two systems after copying.
           Solution scenario 4)b): See Note 184322.
Scenario 5) You want to import a client copy in a source system.
           Solution scenario 5): See Note 325470.
Thanks & Regards,
Suchitra.V

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What is the logical system name used for in R/3?

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