Placement Groups

• Logical grouping of instances within a single AZ. Using placement groups enables applications to participate in a low-latency 10 Gbps network. Placement groups are recommended for applications that benefit from low networking latency & high network throughput.

– Placement groups cannot span multiple AZ’s – The name you specify for a PG must be unique within your AWS account. – Only certain types of instances can be launched in a placement group (Compute Optimized, GPU, Memory Optimized, Storage Optimized). – AWS recommend homogenous instances within placement groups. – You can’t merge PGs. – You can’t move an existing instance into a PG. You can create an AMI from your existing instance, and then launch a new instance from the AMI into a PG.