AWS Architect Associate - Reminder
General purpose SSD have a maximum of 10.000 IOPS.
It is possible to detach non-root volume from running EC2 instance.
An EC2 placement group is used to determin how far are instances placed between each other. In cluster mode, they will be placed to reduce the latency inside a single AZ. In spread mode, they will be placed on different underlying hardware (and potentially in different AZ).