HA A-P configuration in FortiGate with multiple VDOMS

Nothing really as long as all vdoms on the primary unit is primary, and all vdoms on the secondary unit is secondary. When you debug it, use "get sys ha status" to see the syncing status and use "diag sys ha check cluster" commands if they don't sync up as in the KB.

https://community.fortinet.com/t5/FortiGate/Troubleshooting-Tip-HA-synchronization-issue-cluster-out-of-sync/ta-p/193422

Toshi

Dear sasaki11,

Thank you for posting to the Fortinet Community Forum.

Problem Description:-
HA A-P configuration in FortiGate with multiple VDOMS

The HA configure with multiple VDOM is same as you configure in non-VDOM state
Please find the below article on how to configure HA
https://docs.fortinet.com/document/fortigate/6.0.0/cookbook/661074/high-availability-with-two-fortigates

With multiple VDOM there is a concept of VDOM partitioning
Please go through the link below for your reference
https://docs.fortinet.com/document/fortigate/6.2.0/cookbook/599385/ha-virtual-cluster-setup
https://www.fortinetguru.com/2017/01/ha-virtual-clusters-and-vdom-links/#:~:text=In%20a%20VDOM%20partitioning%20virtual,traffic%20between%20both%20cluster%20units.

Let us know if this helps.

Thanks