What Is Scale Up and Scale Out?

SAP HANA nodes can be expanded in the scale-up or scale-out mode.

• Scale-up mode: Also called single-node system mode, in which an SAP HANA system contains only one valid node. If high availability (HA) is required, construct such an architecture using two single nodes through System Replication. In the scale-up mode, when the system requires expansion, add CPUs, memory capacity, and hard disks to the node.

  HUAWEI CLOUD does not support scale-up expansion for a node on which SAP HANA is running.

• Scale-out mode: Also called cluster system mode, in which an SAP HANA system contains multiple nodes. In the scale-out mode, when the system requires expansion, add more nodes to the system.