Amazon EC2 推出的新設計 Spread Placement Group，用來打散 instance：「Introducing Spread Placement Groups for Amazon EC2」。
本來的 Cluster Placement Group 是將機器集中在一起，對於 latency 極為敏感的應用會有幫助 (像是下面有提到 HPC 應用)；這次推出的 Spread Placement Group 則是要求跑在不同機器上，打散降低風險：
Spread placement groups help reduce the likelihood of failures within clusters or groups of instances. Amazon EC2 has had cluster placement groups, which enable applications to get the low-latency network performance necessary for tightly-coupled node-to-node communication typical of many HPC applications. Now with spread placement groups, member instances will be placed on distinct hardware, reducing the impact of hardware failures on your applications.
Spread placement groups are available in all AWS regions. To get started, visit the AWS Management Console, AWS Command Line Interface (CLI), and AWS SDKs.