What should the architect recommend for designing the PvD storage for scalability?

XenServer local storage is not scalable beyond a single host and does not provide the high availability or flexibility needed for a scalable PvD solution.

XenServer shared storage provides the necessary scalability and high availability for PvD, allowing multiple hosts to access the same storage, facilitating VM migration, and supporting features like high availability. This enables easier expansion and ensures continuous operation.

While CIFS shares can be used for some file-based storage, dedicated shared storage solutions are generally preferred for primary VM disk storage like PvD due to better performance and management integration with hypervisors.

ShareFile StorageZones are designed for enterprise file synchronization and sharing, not for hosting virtual machine disks like PvD, which require direct block or high-performance file access by the hypervisor.