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High Availability is licensed per pool, which is an internal grouping of a primary and secondary server. You receive a 30-day evaluation license for an unlimited number of HA pools.
You do not need to purchase a second additional polling engine license or additional product licenses for the secondary servers and polling engines in your HA pools.
If you are setting up multiple pools, activate all of your HA pool licenses. When you set up your HA pools, each pool automatically consumes one HA pool license until no more licenses are available.
Licenses are automatically assigned to the pool with the Main poller and then to pools without licenses.