Re: HA cluster synchronization after a configuration restore that modifies the ha configur
First, what is your purpose/objective of restoring the config file(?) to the current a-p master unit? Is it to change something in bulk, or to fix something broken on the master?
In either case, I would suggest let the other unit take the master role first, isolate the original master unit from the cluster/network, restore the (modified) config file via the dedicated management interface, then disconnect the acting master from the network at the same time reconnect the intended master to the network to take it over OUTSIDE of HA operation (both are masters), then reboot (all) other units so that uptime for the intended master would be the longest. After that, you re-connect HA (heart-beat interface(s)) back to normal so the slave(s) would sync up with the master.