Hi sirex, it does not matter if you run two Splunk instances or one Splunk instance on one server. Each Splunk instance will use some kind of license, locally installed or provided by a remote license master. Most important: each Splunk instance will count the amount of raw data coming in, towards the license usage. Just as example: if both instances use the same license and both are indexing 5Gb each you will need a 10Gb license. hope this helps ... cheers, MuS ... View more