Logon groups not working as planned

[Former Member]

Hello.

I recently discovered a issue on one of our ERP-systems.

The system consists of one CI/DB-instance and 3 DI-instances.

We've configured logon-groups for load-distribution, so that all dialog-users are distributed on the DI-servers according to the load on the individual instances, this is standard.

However, after recently updating the SAP Kernel to 7.00 x64 p336 i noticed that users are now able to logon to the CI/DB instance. I cannot figure out how, as they have no rights to customize the saplogon themselves, they are forced through the load-balancing feature, meaning they should eventually end up on one of the DI-instances.

This is not the case anymore and the CI/DB-server now serves as the natural first-choice for 60-70% of all DIA-users.

There is nothing wrong with the configuration of logon-groups, the CI/DB-instance is not part of this and never has been.

I've been looking around inside the system for an explanation, but i cannot find any reasonable explanation.

Has anyone experienced similar issues and does anyone have any knowledge of troubleshooting the logon-load-balancing mechanism ?

BR Gerhard Andreassen.

[Former Member]

Hi Gerhard,

You can use the lgtst program to test if your logon groups are working correctly. Just go to the OS level and use the following command as sidadm:

lgtst -H -C 10

This will do 10 logins to your logon groups and it should display the selected application servers. See if your CI is going to show on this test.

Cheers,

Maurício