Difference between Dedicated Host and Dedicated Instance in AWS (Dedicated Host vs Dedicated Instance)

Following are the basic differences between Dedicated Hosts and Dedicated Instances:

Dedicated Instances run on dedicated host. When you restart your dedicated instance, there is a possibility that it run on different dedicated host. So, physical parameters may not remain the same. 

Dedicated Host is a dedicated physical host where you can launch your dedicated instances. All the physical parameters remain the same when the instances over this host are restarted. You have visibility over how your dedicated hosts are utilized and you can determine how many sockets and cores are installed on the server. These features allow you to minimize licensing costs in a bring-your-own-license (BYOL) scenario and help you address corporate compliance and regulatory requirements. BYOL (Bring Your Own License) are tied to physical host. It reduce costs by allowing you to use your existing server-bound software licenses. 

To summarize, following are the advantages of dedicated hosts:
  1. Save Money on Licensing Costs (BYOL)
  2. Visibility of Sockets and Physical Cores
  3. Help Meet Compliance and Regulatory Requirements
  4. Affinity
  5. Instance Placement Controls

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