Expert Persona: Senior Systems Architect / Lead Software Engineer

The appropriate group of people to review this topic would be a Systems Architecture Review Board or a Technical Design Committee specializing in distributed hardware-software integration. This group would focus on data isolation, security, and the robustness of the storage hierarchy.

Abstract:

This technical specification details a robust, controller-enforced on-disk cache management strategy designed to ensure strict data isolation across multiple scanning devices. The architecture eliminates user-driven configuration risks by delegating the directory hierarchy to the scanner controller. By utilizing a two-axis separation logic—based on unique hardware FPGA IDs and specific configuration hashes—the system guarantees collision-free storage even in complex network-attached storage or shared-filesystem environments. The design rationale prioritizes deterministic layout over user flexibility to maintain system integrity.

Summary of Cache Separation and Storage Logic:

• Enforced Controller Logic: The directory structure is entirely managed by the scanner controller. Users are restricted to setting the root cachePath, preventing "bodgery" or manual configuration errors that could lead to data corruption.
• Hardware-Level Isolation (Axis 1): The system creates per-scanner subdirectories using the unique FPGA ID (e.g., 00a96188006c060a). A dedicated ID (ffffffffffffffff) is reserved for the simulator to maintain separation between virtual and physical hardware.
• State-Specific Isolation (Axis 2): Within each scanner’s directory, further sub-segmentation is performed using a configuration hash. This ensures that different operational parameters for the same physical device do not overwrite or conflict with one another.
• Collision Prevention Rationale: This rigid, automated layout is a defensive design choice specifically intended to prevent collisions in high-concurrency environments, such as when multiple hosts access a shared network filesystem.
• Deterministic Directory Hierarchy:
  • Level 1: cachePath (User-defined root)
  • Level 2: /<scanner-id>/ (Hardware identity layer)
  • Level 3: /<configuration-hash>/ (Operational state layer)
• Key Takeaway: The design removes "wobble" regarding support requirements by mandating a specific, non-negotiable disk layout, thereby strengthening the overall reliability of the system's data-handling capabilities.