What does rack mean in AWS EC2 partition placement groups?

Question

The documentation of AWS partition placement group says:

Each partition within a placement group has its own set of racks.
No two partitions within a placement group share the same racks.

What does rack mean? Are they a shelf of servers that share power and network as a unit? Does it refer to outpost rack?

From What is an AWS Outpost Rack? - YouTube:

Reference

Using partition placement groups for large distributed and replicated workloads in Amazon EC2

user_13460933 · Answer

It refers to a separate area of the AZ data center with your physical host. The whole point of partitioned placement groups is that hosts are divided between a number of separate physical hosts, that are semi redundant to failing.

Basically they cannot be 2 physical machines sat on the same rack, they need to be seperated.

What does rack mean in AWS EC2 partition placement groups?

Reference

1 Answers