Complete Installation and Upgrade Information for webMethods and IBO Products : Upgrading webMethods and Intelligent Business Operations Products : Critical Requirements For Successful Upgrade : Product Requirements : Integration Server Clustering Requirements
Integration Server Clustering Requirements
If you are going to upgrade a cluster of Integration Servers, Software AG recommends the procedure below.
1. Install a matching set of 9.8 Integration Servers. For example, if you have a cluster of three old Integration Servers named IS1_old, IS2_old, and IS3_old, with an external load balancer to distribute client requests, install IS1_new, IS2_new, and IS3_new.
2. Perform the steps in Completing the Integration Server and Hosted Products Upgrade for each Integration Server in the cluster.
3. Shut down IS1_old.
4. Migrate IS1_old data to IS1_new and customize the IS1_new startup files using the instructions in Completing the Integration Server and Hosted Products Upgrade.
5. Shut down IS2_old and IS3_old.
6. Do the following for IS1_new:
a. Start IS1_new.
b. If IS1_old was not configured to use a Terracotta-based clustering solution, configure IS1_new to use a Terracotta-based clustering solution. Make sure IS1_new is processing client requests. For instructions, see webMethods Integration Server Clustering Guide 9.8.
Important:  
Support for Coherence was discontinued in release 9.0.
c. Update WSDLs, connect functions to database components, and set up central user management on IS_new as described in Completing the Integration Server and Hosted Products Upgrade.
7. Repeat steps 4 and 6 for IS2_new and then for IS3_new.
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