Installation Guides > Installing Server > Troubleshooting UNICOM Intelligence Interviewer Server > After upgrading to a UNICOM Intelligence Server cluster, custom instances that were created for the purpose of load balancing are no longer present on the servers
 
After upgrading to a UNICOM Intelligence Server cluster, custom instances that were created for the purpose of load balancing are no longer present on the servers
Instances were introduced in DPM for the purpose of load balancing in version 5.6. When upgrading from version 5.6 to 7.5, the installation process removes the 5.6 installation, resulting in the removal of all installed instances (including custom instances) from each server in the cluster.
You must recreate any custom instances on each server in the cluster after upgrading to UNICOM Intelligence Server.
For more information, see Load balancing.
See
Troubleshooting UNICOM Intelligence Interviewer Server