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MESSAGE SERVER
It is the first process (server) to be started based on hostname, port, customer hardware key, and executable path.
Its main purpose is to load balance the system (when more than one Dialog instance is configured)
It is also used to handle the lock requests that are initiated from dialog instances. There will be only one message server in the entire system. It is monitored in SMMS (MSMON or SAPMMC).
ST07 is used to identify the workload on the system based on functions on the system. It is used to identify which functional are is consuming time (response time), which functional are is swapping out the content from buffer, number of instances, load on the system/instance, number of processes and number of users.
It is a motivation to deploy additional instances/configure load balancing based on the load generated by functional area.
CONFIGURE LOAD BALANCING
It is configured when more than one instance is available in the landscape. Identify the functional load in the ST07 and based on that define logon load groups.
Example-:5000 users company has 22 instances.
There are 1000 users who work on sales, 1000 on finance, 1000 on material procurement, 50 on HR, 500 on production process, 500 on logistics and remaining 950 on miscellaneous.
Identifies the total number of Dialog steps based on functional modules. Allocate an instance for every 250 people.(Don’t load on CENTRAL INSTANCES)
Define logon group SALES in SMLG and allocate 4 instances
Define logon group MATERIAL in SMLG and allocate 4 instances
Define logon group FINANCE in SMLG and allocate 4 instances
Define logon group LOGISTICS in SMLG and allocate 3 instances
Define logon group HR & PRODCUTION in SMLG and allocate 3 instances
Define logon group MISCELLANEOUS in SMLG and allocate 3 instances
CENTRAL INSTANCE-:
Keep it as free as possible to monitor all the instances.
Define SMLG and define the above groups and assign.
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