What is a prerequisite for adding hosts to an SAP HANA scale-out system?

In an SAP HANA scale-out system, utilizing a shared file system is essential for the proper functioning of distributed database instances. A shared file system allows multiple hosts to access the same files, which is crucial for coordinating data storage and ensuring consistency across the different nodes in the scale-out architecture. This enables efficient communication and integration of additional hosts into the existing system without risking data integrity or availability.

When you scale out, it’s important that all nodes work seamlessly together; hence, accessing a centralized, shared repository of data is a foundational requirement. The shared file system allows for features such as shared backups, simplified management, and efficient data handling across multiple hosts, which are vital for a successful scale-out configuration.

Other options either do not represent fundamental configuration requirements necessary for scaling out or address aspects that are not prerequisites in the context of adding hosts.