Multiple Coexistence Manager behind a loadbalancer

Question

Hi there, 
 a customer of us is in the process of a Notes to Exchange migration. In general it is working fine, but the customer mentioned that the Coexistence Manager's cpu utilization is always to high due to the high amount of freebusy requests and mail flow between Notes and Exchange. 
 They already setup a second Coexistence Manager server, but the question is now, what would be the best practise to implement both together behind a loadbalancer? 
 Kind regards, 
 woelki

Trevor Taegder · Accepted Answer

Hello Woelki, 
 
 The CMN Mail Connector is not a fully functional MTA. The CMN Mail Connector is an SMTP relay that takes incoming connections from Exchange (identified by the Inbound Servers list) and makes an outbound connection to Domnio (using round-robin from the Domino servers listed on the Outbound servers list). In the opposite direction, the Mail Connector takes inbound connections from Domino and makes an outbound connection to Exchange using the Outbound Servers list (using round-robin). 
 
 If you still need additional assistance, your Quest Account Manager can help loop in additional resources, such as Quest Professional Services (PSO) that may be able to assist with these types of advanced configurations. If you need assistance locating your Quest Account Manager, please let me know. 
 
 You can also reach your local Quest Sales office from the following site: 
 
 https://www.quest.com/buy/ 
 
 Trevor Taegder 
 Senior Technical Support Engineer 
 Quest | Support

Jeff Shahan · Answer

First off, not installing everything on a single server is best practice for production. From your description, separating the free/busy processes and mail to separate servers would be a good start. Both the mail and exchange to note f/b can be protocol load balanced very easily. In fact just separating the processes to separate servers might be enough for your impamanetation

Trevor Taegder · Answer

Hello Woelki, 
 
 Thanks for posting to the Coexistence Manager for Notes (CMN) forum. I understand that you would like to configure CMN to work with a load balancer. As Jeff mentioned, simply standing up a new CMN server and dividing up the roles, so that one CMN server is processing free busy requests and another CMN server is processing mail items, may be the easiest solution to implement. 
 
 Configuring CMN to work with a load balancer isn't supported by Quest Support. The CMN Mail Connector is an SMTP relay, so the load balancer would need to be configured to pass SMTP traffic. The CMN Free Busy Connector uses HTTPS, so the load balancer would need to be configured to pass HTTPS traffic. 
 
 If you still need additional assistance, your Quest Account Manager can help loop in additional resources, such as Quest Professional Services (PSO) that may be able to assist with these types of advanced CMN configurations. If you need assistance locating your Quest Account Manager, please let me know. 
 
 You can also reach your local Quest Sales office from the following site: 
 
 https://www.quest.com/buy/ 
 
 Trevor Taegder 
 Senior Technical Support Engineer 
 Quest | Support

Multiple Coexistence Manager behind a loadbalancer

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