Technical Tip: FortiGate in HA Cluster reports an Error 'secondary and primary have different hdisk status, Shutdown the box!'

[lkumar]

Description	This article describes an issue in which the secondary firewall shuts down following an attempt to upgrade the HA cluster to firmware version 7.4.1 build 2463.
Scope	FortiGate 401F
Solution	During a firmware upgrade of the FortiGate 401F HA cluster using the uninterruptible upgrade method to FortiOS v7.4.1, the secondary FortiGate upgrades successfully to version 7.4.1 and then shuts down, displaying the following log message on the console interface.  secondary and primary have different hdisk status, Shutdown the box! However, the primary firewall fails to upgrade as the upgrade window is exceeded. To resolve this issue, disconnect the primary firewall from the HA cluster, manually upgrade both the primary and secondary units to firmware version 7.4.2 or later, and once the upgrades are successfully completed, reconnect the HA cables to restore high availability.  For procedure to manually upgrade the individual units in HA cluster, Refer to Technical Tip: Manual upgrade procedure of a FortiGate HA cluster This is a known issue affecting the FortiGate 401F model during the upgrade to firmware version 7.4.1.