Home > Workload Solutions > SAP > Guides > SAP HANA TDI Guides > Dell Validated Solution for SAP HANA TDI Deployments with Dell Unity XT Storage > SAP HANA deployment models
The SAP HANA system combines SAP software components that are optimized on proven partner-provided hardware. Two models are available for on-premises deployment, as shown in the following figure:
An SAP HANA appliance includes integrated storage, compute, and network components by default. The appliance is certified by SAP, built by one of the SAP HANA hardware partners, and shipped to customers with all its software components preinstalled, including the operating systems and SAP HANA software.
Dell Technologies provides preinstalled SAP HANA appliance solutions for a faster time-to-market and easy integration into an existing or new SAP landscape. However, the appliance model presents the following limitations for customers:
With the TDI model, different workloads can share the storage and network components to optimize total cost of ownership (TCO). Customers can:
For more information, see the following SAP documents: