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Former Member

Even logon distribution using load balancing

We are trying to scale our system to distribute logons across multiple app servers. We have setup Logon groups and have set MSHOST in our connection configurations but since all logon's occur at roughly the same time, they all end up going to the same app server. We have 40 connections and ideally would want 20 to go to server A and 20 to go to server B, so that when each logon has work to do, the load gets evenly distributed.

We have tried modifying the threshold value for each app server in the logon group but that has had no impact.

Any suggestions?

Thanks

Tim

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2 Answers

  • Best Answer
    Aug 11, 2009 at 05:14 AM

    Tim

    Logon group should work fine if there is difference in login time by at least 5 minutes.

    SAP calculates the best server for dialog logon by determining the quality of a particular server. It gives weightage to number of users and response time of dialog in a ratio 5:1 and then calculates the quality of the server. This information gets updated in every 5 mins. User at a particular time are assigned to the best server ( according to quality).

    When all the users are moving to the same server, you can check what is the quality of a particular server.

    SMLG-->F5 ( Goto>Load Distribution) and SMLG--->F6(Message server status area). Check if the current logon instance is changing with time. If that is changing then your logon groups working...If not then then raise a OSS message to SAP.

    Even if your logon grp working but you are unable to get the advantage,

    you can set up multiple logon group with different app server. Like GRP1 will have App1, APP2 then GRP2 will have App3, App4 and so on and then ask your user to use different logon grp.

    One more thing, what is the auto_logout setting is your system? if users frequently login and then after work log off they can get the best effor in terms of logon group.

    Waiting for further details from you

    Edited by: Anindya Bose on Aug 11, 2009 10:44 AM

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    Former Member
    Aug 11, 2009 at 07:36 AM

    Hi Tim,

    have a look at SAP note 51789 - this works like a charm for nearly 50/50 distribution.

    Best regards

    Thomas

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