Placement Groups
Placement Groups are logical groupings of instances within a single Availability Zone, enabling you to influence their placement and get the desired performance characteristics. There are three types of placement groups: Cluster, which packs instances close together for low-latency and high network throughput; Partition, which spreads instances across logical partitions within the same zone, providing fault tolerance for more independent workloads; and Spread, which ensures instances are placed on distinct underlying hardware, increasing fault tolerance for a small number of critical instances.
Guide on Placement Groups in Amazon EC2
What is it?
Placement Groups are a way of placing instances in logically grouped, distinct network packets. This feature is provided by Amazon EC2, and is important for communication delay minimization and increasing network throughput.
Why is it important?
Placement Groups are important because they allow maximum network performance for a group of instances. This can be beneficial for certain high networking applications. Also, for low latency, high packet rate or high bandwidth applications, it is recommended to launch these instances in the same Placement Group.
How it Works?
Placement Groups work by ensuring instances are located in a way that allows high bandwidth, low latency networking between them. There exist different types of Placement Groups - Cluster, Partition, And Spread, each providing different network performances and levels of fault tolerance.
Exam Tips:Answering Questions on Placement Groups
-Remember the different types of Placement Groups
-Understand how each type of Placement Group contributes to different degrees of fault tolerance and network performance
-Remember that you cannot move an already running instance into a Placement Group
-Know that Placement Group names must be unique within your AWS account
-Lastly, be aware that the instances within a Placement Group should be of the same type
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