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Hello singhraj,
"VSAN THREE SITES OR FOUR SITES?"
Do you mean nodes or sites? Minimal set-up for vSAN is 3 nodes (or 2 data-nodes + 1 Witness), if one is talking 'sites' then this usually indicates stretched clusters which consist of 1-15 data-nodes on 2 'sites' + Witness so saying 4 sites makes little sense.
"TWO DATA CENTER LINK MODE (NESTED)
ONE FOR NSX (I DON’T KNOW IF IT BETTER IDEA TO INCLUDE IN BOTH DC?"
Please read the requirements documentation for these products - they require a significant amount of real RAM to function:
vCenter = ~10GB minimum per vCSA (6.x)
NSX = ~22GB+ on version 6.2
vSAN = ~10GB per node with your current cache-tier size configuration:
https://kb.vmware.com/s/article/2113954
Basically, you likely don't have the gear to run all of the above so pick and choose - do you want/need a vSAN cluster or do you want/need to test NSX?
You likely can't do both here.
If you want to test these products with zero hardware investment, there is always HOL:
"NETWORK DESIGN?"
There is an abundance of information already available:
https://storagehub.vmware.com/t/vmware-vsan/vmware-r-vsan-tm-network-design/
Please also consider checking if your caps-lock key is broken (most would just assume you are SHOUTING :smileygrin: )
Bob
