I believe that in an active/active HA pair the total throughput is equal to the performance of a single box, not the sum of both boxes.
For the PA-5050, the throughput for an Active/Active HA pair is 5Gbps with threat prevention.
Where is this documented?
I need to show it to management
In Active/Active mode, Both devices in the cluster are active processing and passing traffic:
> Devices back each other, taking over primary ownership if either one fails
> Both devices load share the traffic
> w/o external load balancers, traffic is “shared” between devices based on routes on up/downstream devices, or manipulating default gateways
> No increase in session capacity
> Not designed to increase throughput
I would recomend you to contact with your Palo Alto SE to get a proper documentation for the same.
In Palo Alto Active/Active is not at all about capacity, so you won't find it mentioned in the documentation. The use cases are just two:
See the discussion in the Active/Active Tech note for more details.
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