Mainly ARS upgrade is successful and CMDB upgrade is also quite successful while Atrium Web Service components upgrade often fails.
Due to this, rollback happens all including successfully upgraded ARS and CMDB as well.
This impacts the system deployment as it requires additional time to perform the upgrade installation again from beginning (ARS).
There is no proper pre-upgrade validation tool available to ensure all existing components are ready for upgrade, especially for Atrium Web Service components.
Pre-check and health check features works correctly, however it doesn't detect some errors and fail CMDB, especially Atrium Web Service upgrade.