Upgrading the FortiManager firmware for an operating cluster
You can upgrade the FortiManager firmware of an operating FortiManager cluster in the same was a upgrading the firmware of a standalone FortiManager unit. During the firmware upgrade procedure, you connect to the primary unit Web-based Manager or CLI to upgrade the firmware.
Similar to upgrading the firmware of a standalone FortiManager unit, normal FortiManager operations are temporarily interrupted while the cluster firmware upgrades. As a result of this interruption, you should upgrade the firmware during a maintenance window.
To upgrade FortiManager HA cluster:
1. Log into the primary unit’s Web-based Manager using the admin administrator account.
2. Upgrade the primary unit’s firmware. The upgrade is synchronized between the primary device and backup devices.
Administrators may not be able to connect to the FortiManager Web-based Manager until the upgrade synchronization process is complete. During the upgrade, using SSH or telnet to connect to the CLI may also be slow, however use the console to connect to the CLI.