Disaster Recovery - Active/Active other components

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Hello guys,

I have questions for Disaster Recovery - Active/Active Infrastructure Image below

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  1. The diagram shows three Nodes to be installed. Where does Redis Enterprise software gets installed? Also do we need to purchase 6 Redis licenses for this environment?
  2. How does the load balancer work in this scenario? Also How many load balancers to purchased ?
  3. what kind of Shared storage is it referring to? How much-shared storage does it require?
  4. What version of ElasticSearch and Kibana is required? Is it free of charge?
  5. Why does it Require 3 nodes on each datacenter for Elastic Search and Kibana?

Explain to the above would be highly appreciated. Thanks in Advance