communication b/w Central instance and APP server

[Former Member]

hi

For load balancing we use app servers.Message server at central instance will be alloting user's to appropriate app server. when that particular app servel is also full with user's then how does message server at CI come to know that particular app server is full? who will be giving message to message server at CI?

[Former Member · Accepted solution]

Hi Veera,

There are two different methods through which message server allocates the request to app servers.

Default is the Best in which after every 120 seconds (default) message server reads the quality of app. servers.

After getting the quality information message server send the request to the app server who is havin the best quality.

Second optino is Round Robin. Each server in the group is used in turn for the next logon.

Best Wishes.

Kumar

[Former Member · Accepted solution]

hi rajesh

thanks for reply

So there will not be any message server on the APP server which can communicate with message server on CI regarding the load? plz reply.

[Former Member · Accepted solution]

Message server mostly runs on central instance.There will be only one message server per an SAP system.When an instance is started ( APP server ) its dispatcher will establish a connection with message server and announce the service it provide ( dia, spool, batch etc ).

Thanks

Prince Jose