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You will have 9 JVM instances if you start that domain.
Even if you use the absolute minimum of memory for each you will have about 512M for each (needed for the JVM itself + heap + threadstack) altoghether this will be 4.5G
It will be impossible to run that configuration on that machine as the OS itself need a bit memory.
Also I suppose you will not have more than 8cores.
If you try to test something you can use one standalone instance and deploy all applications here.
A domain with two servers might be possible if you have not much load.
So I recommend to use several machines or a more powerful one.