Q

How can we implement a Domino cluster and manual LEI failover?

We are currently running Domino 5.0.11 and LEI 3.2, and senior management would like to have a failover to a second LEI server. However, Lotus states that LEI is not a clusterable application.

We need to develop a plan to implement a Domino cluster and manual LEI failover. I am concerned about potential problems with manual failover and replication of LEI admin and log databases. I need to verify best methods of doing this or if pitfalls are significant and what other options are.
LEI failover has been and still is a tricky issue. While traditional Domino clustering will not help you in your goal the always-confusing and often-neglected "LEI cluster" offers a solution. The concept of an LEI cluster is that of two or more LEI servers sharing a common administrator database. Using an LEI cluster can offer you failover functionality as well as improved performance through load balancing. It's not perfect, but it can be used effectively to meet your needs.

You set up an LEI cluster by installing a second LEI server. Simply choose the installation option to "Install LEI server using an existing cluster." Don't worry about the wording of the message -- "existing cluster" -- and that it eludes to you having done some special setup to your existing LEI server. Once the second server is set up, you should test it with a variety of non-production activities, just to make sure all the appropriate connectivity software was installed properly. Once you have verified the second server is working properly, you can modify those same non-production activities by ensuring the "designated server" field (under General Options) is set to blank. Not specifying an LEI server name will allow the first available server to execute an activity when it's due. And, voila! You've got LEI clustering with failover in the event of a server going down.

This was first published in April 2003

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