Scale out is a data storage growth method that adds new resources (horizontal growth) rather than increasing the capacity of current resources (vertical growth or scale up). For example, in a cloud storage facility, scale-out growth would mean that new storage hardware and controllers (nodes) would be added to increase capacity. Thus, both storage capacity and performance are increased by the new hardware. In large cloud storage systems where multitenancy and scalability are required, increasing the capacity alone (scaling up) would not handle the increasing data traffic. Scale up is an older method for growth used to make the most out of existing (and expensive) storage hardware resources by increasing their capacity. Lower hardware costs have made it easier for IT organizations to scale out, increasing all capacities (storage, traffic, processing power, memory, etc.) by adding more nodes to the system.
Scale out refers to storage architecture that doesn’t rely on a single controller and grows by adding processing power coupled with additional storage. In a scale-out architecture, the data and the metadata are distributed across all nodes and all solid-state drives in the system. Some scale-out architectures also implement global deduplication across the entire data set. Scale-out architectures add more CPU, memory and connectivity when expanding system capacity. This protects the system from performance decline as it grows. Scale-out architectures enable efficient data reduction because deduplication can be performed across the entire data set.
A storage architecture that offers the flexibility to either scale up or scale out gives IT organizations the ability to add capacity or performance as needed. For SAP HANA and S/4HANA data sets, SUSE Linux Enterprise Server provides automated scale out and scale up installation and management, including Tailored Data-center Integration (TDI) deployments. TDI is an alternative approach to deploying SAP HANA that allows customers to leverage their existing hardware and infrastructure components rather than an all-in-one-box HANA appliance. SUSE Manager may be used to manage SAP HANA scale out environments.