Firewalls in HA Active/Passive or Active/Active allow for "in service" upgrades, meaning that although when a firewall is upgraded it requires rebooting into the new PANOS version there does not have to be any disruption to traffic flowing through the firewalls as the HA peer takes over the connections prior to reboot.
In this video we got through the process of upgrading Palo Alto VM series in high availability but the same process is true of hardware firewalls.
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