Am I able to configure up to 4 devices to act as active/active in high availability?
This should be able to, if one of those 4 get down, the others 3 keep handling traffic. And if another one of those get down, the other 2 keep running and so on.
Is it possible? If it is not, is there any roadmap for so?
You could configure four stand-alone devices, each on a separate leg of a aggregated ethernet link to achieve a similar result. It is very similar to the published solution working with Arista switches show here:https://paloaltonetworks.com/content/dam/paloaltonetworks-com/en_US/assets/pdf/technology-solutions-...
All clusters in PA are just two identical units. You could have two pairs with the four units but the sessions and sync are only between the tow matched devices at a time.
This is unlikely to change in the next few years.
For a very large volume operation you might use load balancers in front of the four or more PA to get higher capacity and failover across multiple clusters.
Palo Alto Networks devices do not aggregate throughput across HA cluster members. Active/Active throughput is same as Active/Passive. For situations in which more throughput than a PA-5060 can provide is required you would utilize the PA-7000 series chassis system. With two chassis you can have anywhere between two and ten data plane cards, each capable of processing around the same traffic as a PA-5060. This scenario would not require third party load balancers and provides increased flexibility over that model. Session sync across all dataplanes in both chassis regardless of Layer 3 or Virtual Wire deployments.
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