I have one MPE and one APE
Which licenses I need purchase to make HA for both (MPE + APE)?
You only need to buy the High Availability license (1 for each server).
The specific license is:
SolarWinds High Availability for SolarWinds Orion - License with 1st-Year Maintenance
HA works as an active/passive pair with HA pools. So if you want to provide HA for both servers, you need 2 pools hence 2 HA licenses.
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