▶ Cluster Placement Groups
- Grouping of instances within a single Availability Zone. Recommended for applications that need low network latency, high network throughput or both.
- Fact : Only certain instance types can be launched into a cluster placement group.
▶ Spread Placement Groups
- A spread placement group is a group of instances that are each placed on distinct underlying hardware.
- Spread placement groups are recommended for applications that have a small number of critical instances that should be kept separate from each other.
▶ Partition Placement Groups
Each partition placement group has its own set of racks. Each rack has its own network and power source. No two partitions within a placement group share the same racks, allowing you to isolate the impact of hardware failure within your application.
"EC2 divides each group into logical segments called partitions."
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