When the original server runs on an earlier CMS software version, the HA upgrade process follows a specific sequence of installation and administration tasks. Perform a full software or platform upgrade from a previous release to release 21.0. This upgrade process involves various maintenance backups, data migrations, and data restores. Carry out these activities in a specific order to ensure minimal system downtime and streamline provisioning.

The following sections outline the steps to upgrade the CMS version of the original server. Review these sections to understand the requirements for a full upgrade.