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Hi,
Cluster placement groups are only recommended for SAP HANA scale-out deployments.
This is because the certification requirement for >9Gbps single tcp flow. This is a part of the HANA inter-node network requirement.
Otherwise you don't need or are not required to use placement groups with SAP HANA in AWS (i.e. you're not required to have a PG between HANA and the SAP App server or HANA and other SAP systems it may talk to).
I hope that helps.
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Suggestion 13.4.3 – Use placement groups for SAP HANA scale out
To meet the SAP certification for internode communication in an SAP HANA scale-out deployment, it is necessary to use a cluster placement group.
https://docs.aws.amazon.com/wellarchitected/latest/sap-lens/best-practice-13-4.html
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