Developer Documentation Library > Interviewer - Server Admin > UNICOM Intelligence Interviewer - Server Admin architecture > Load balancing > UNICOM Intelligence Interviewer - Server Admin load balancing configuration > Important information if upgrading from version 5.6
 
Important information if upgrading from version 5.6
Instances were introduced in DPM for the purpose of load balancing in version 5.6. When upgrading from version 5.6 to the current version, 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.
After upgrading to the current version, you must recreate any custom instances on each server in the cluster.
See also
Load balancing
UNICOM Intelligence Interviewer - Server Admin load balancing configuration