Is there any documentation on how to properly shutdown a clustered/HA FW pair and then restore connectivinty power verifying proper function once power is restored?
As this is a very uncommon thing to do, there is no article that directly describes this exact procedure
To shut down an appliance you can run '> request shutdown system' from the CLI which will bring down the system in a nice way
To bring a cluster back, it would probably most closely resemble restoring a cluster during an upgrade process, which is described here : https://live.paloaltonetworks.com/t5/Featured-Articles/Best-Practices-for-PAN-OS-Upgrade/ta-p/111045
eg. bring back one member, ensure it is functional, then return the second member
I'm not sure that shutting down a cluster and power backing up is an uncommon thing to do.
I don't see anything in the link that related to shutdown.
If they are powered down via CLI or GUI will they power back up in cluster after power cord is reinserted?
It's uncommon in the sence that you would seldomly shutdown a firewall on purpose in a planned manner. Most people will only ever restart the box during system upgrades and would seldom issue a shutdown command.
Once the system is shutdown, the only way you could restore it is by unplugging the power and reinserting it, there's a nice warning about this when you actually attempt to shut this down. At that point the device will act the same as it does when you restart it.
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