on 01-13-2015 12:57 PM
Hi,
We have an strange issue in one system with the load balancing. There are six application servers with the same operating system, RAM, CPU, network, etc, but in one of them the workload in ST03 is very higher than the others, and most of the users are logged in it
For example, for dialog steps:
And for all kind of task:
Any ideas where We have to investigate to discovered the reason?
Regards
Hello,
No problem with ST03, it is about Load balancing
"Logon load balancing increases the efficiency of various workgroups that have been defined, in terms of performance and system resource consumption, by distributing users across available application servers based on requirements for workgroup service and load sensitivity."
What kind of log on group is configured?
Did you checked SMLG ?
List of active SAP server instances and available LOGON groups
lgtst -H <host name message server> -S sapms<SID>
SAP notes:
51789 - Poor user distribution in logon distribution
26317 - Set up for LOGON group for autom. load balancing
1847056 - 'Load balance not working'
Wiki:
http://wiki.scn.sap.com/wiki/display/NWTech/Usage+of+thresholds+in+SMLG
You can check the logon load by displaying a list of the servers that are available and an overview of load distribution in your system.
This list also shows the current performance status of the application servers that are both assigned to logon groups and currently running. Every five minutes, or after every five logons, each application server writes its own performance statistics data to a memory-resident table on the message server. The current logon server is refreshed for each group.
BR
Tamas
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Hi Tamas,
We have six logon groups (apart of SPACE), but all of them have the same caracteristiques. I executed lgtst program and everything is Ok. I also checked these notes and documents, but I could see nothing. In smlg --> load distribution, the AS number 2 always has the most dialog steps, users, but not always the most quality or response time:
Regards.
Hi Maximino ,
You can also find some details using st03n - > Expert Mode -> Load History & Distribution -> Users Per Instance
You can go back on "previous period " to see the details of previous dates . Double clicking on any instance will give you the details on the users .
By classifying the users you may be able to come to a conclusion whether it is dialog/RFC user .
And if it is a normal user try to classify them into regions ( If your system is globally used ) . If any particular region is hitting one server then it is most probable that their sap logon pad is not configured with the message server .
Thanks ,
Manu
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Hi ,
Also check RZ12 whether the parallel generators are configured for all the servers and whether the dialog usage percentage for RFC users are more or less same for all the servers
Also check for the RFC configured on other systems to this system . In the RFC connections on other SAP systems is the load balancing used ?
Thanks ,
Manu
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Either a network issue or users are going directly to this application server, not by LB.
You need to put a network trace 1st and users running on this server.
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