This feature request proposes adding the Partition Number within a Placement Group for OpenShift MachineSets & in CAPI. Currently, OCP 4.14 supports pre-created Placement Groups (RFE-2194). But the feature to define the Partition Number within those groups is missing.

Partition placement groups offer a more granular approach to instance allocation within an Availability Zone on AWS, particularly beneficial for deployments on AWS Outpost (https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/placement-groups-outpost.html). It also allows users to further enhance high availability by distributing instances across isolated hardware units within the chosen Placement Group. This improves fault tolerance by minimizing the impact of hardware failures to only instances within the same partition.

Some Benefits are listed below.

• By leveraging Partition Numbers, users can achieve a higher level of availability for their OpenShift clusters on AWS Outpost, as failures within a partition won't affect instances in other partitions.
• Distributing instances across isolated hardware units minimizes the impact of hardware failures, ensuring service continuity.
• It provides optimized resource utilization.