Directory Information Recovery via Metadata Location Servers

The system performs preliminary actions by creating alternative path records and backup directory entries during file creation and normal operations. When intermediate nodes fail, these pre-established alternative paths enable direct access to files without traversing through failed nodes, thus maintaining reliability while preserving ease of operation.

The patent introduces intermediary components such as backup directory servers and alternative path records that mediate between clients and failed intermediate nodes. These intermediaries store metadata and path information that allow clients to bypass failed nodes and directly locate files, resolving the contradiction between simple hierarchical access and reliability.

The patent segments the directory search space by organizing files into multiple directories and maintaining alternative path records for each file. Instead of searching the entire directory structure, the system divides the search into smaller segments by checking alternative paths first, then only searching specific subdirectories if needed, thus reducing search time while ensuring complete coverage.

The system applies partial action by searching only the necessary portion of the directory structure. By maintaining alternative path records that point directly to file locations, the system avoids excessive searching of unrelated directories. The search is limited to checking alternative paths and relevant subdirectories rather than traversing the entire directory tree.

The patent implements multi-functionality by enabling standard storage servers to perform both data storage and directory service functions. The system allows any server in the network to act as a directory server or data server depending on needs, eliminating the requirement for specialized hardware. This universal approach maintains high I/O performance while reducing hardware complexity and cost.

The system uses copying by maintaining multiple copies of directory information and path records across different servers. Instead of relying on specialized hardware for directory services, the patent distributes directory data copies across standard servers, allowing any server to provide directory services and improving performance through parallel access without increasing hardware complexity.