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Licensing Virtual Machines

8/3/2009 10:45 AM
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How does licensing for Virtual Machines work?  You need one copy for each machine, real or virtual. There are ways to use FRP on many virtual machines without buying more licenses for each one,  but you may not get the same performance in such an installation as in cases where FRP is installed on each virtual machine.

For licensing, The key is on which machine are you installing FRP?  You can install it on the OS of the host machine or on each VM.  IE: 1 Server with 3 virtual machines could require as many as 4 licenses depending on how you install FRP, or one installation of FRP on the host OS may do it for you.

If you make your virtual machines save to a local folder on the host machine then you would need only one license to service all the virtual machines by installing on the main machine only and doing replication to and from local folders on the main machine.  This replication node on the host machine may then also replicate to any other FRP node in the world if you desire. In this case you could take a performance hit on the replication speed of FRP due to the fact that one copy of FRP will be tasked with the work of what might normally be the work of several installations of FRP each with it's own CPU and Memory resources. 

The effect of this installation can only be determined on a case by case basis by installing the trial version(s) and simulating the load under which they must replicate.  It is quite possible that in many cases a single installation will work well with several virtual machines if the workload is not too excessive and the scheduling is staggered.  A test of your scenario with the trial version will help you to determine this for yourself.
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