- Placement Groups Cluster
- Pros: Great Network (10 Gbps bandwidth between instances)
- Cons: If the rack fails, all instances fails at the same time
- Use cases:
- Big Data job that needs to complete fast
- Application that needs extremely low latency and high network throughput
- Placement Group Spread
- Pros:
- Can span across Availability ZOnes (AZ)
- Reduced risk is simultaneous failure
- EC2 instances are on different physical hardware
- Cons:
- Limited to 7 instances per AZ per placement group
- Use cases:
-
Application that needs to maximize high availability
-
Critical Applications where each instance must be isolated from failure from each other
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- Pros:
- The ENI can have the following attributes:
- Primary private IPV4, one or more secondary IPv4
- One ELastic IP (IPv4) per private IPv4
- One or more Security Groups
- A MAC address
- You can create ENI independently and attach them on fly (move them) on EC2 instances for failover
- Bound to a specific availability zone (AZ)
