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diff --git a/content/notes/aws-solutions-architect/7.ec2-placement-groups.md b/content/notes/aws-solutions-architect/7.ec2-placement-groups.md new file mode 100644 index 0000000..85f4f55 --- /dev/null +++ b/content/notes/aws-solutions-architect/7.ec2-placement-groups.md @@ -0,0 +1,16 @@ +--- +title: 07 - ec2 placement-groups +course: ["aws solutions architect"] +--- + +# EC2 Placement Groups + +Placement groups allow you to define where your EC2 instances are deployed on AWS infrastructure. + +A placement group is either: + +1. _A cluster_: puts your instances in a low latency group in the same AZ. This helps with networking as instances are close to one another. Drawback is if the AZ fails, they all fail. **use case**: Good for big data jobs, apps that need low latency between instances. +2. _Spread_: Think of this as opposite to clusters. Each instance is on different hardware across different AZs. This means reduced failure risk. Limited to 7 AZ per placement group. **Use case**: maximum high availability. +3. _Partition_: spreads instances across different partitions within an AZ. Each partition represents a rack in AWS. Instances are distributed across different hardware racks and AZs in same region. **use cases**: Big data application, which are petition aware. + + |