Tape Drive Memory Deduplication Using Chunk Pointers

The patent segments the data stream into fixed-size chunks and processes them in parallel using multiple threads. Each thread handles a specific chunk independently, allowing simultaneous deduplication operations without sequential tape positioning delays. This segmentation enables the system to maintain high storage efficiency while improving processing throughput by eliminating the bottleneck of sequential access.

The patent performs preliminary actions by pre-processing data chunks in memory before writing to tape. It calculates chunk hashes, identifies duplicates, and prepares deduplication mappings in advance. This preliminary processing in the fast memory subsystem allows the actual tape write operations to proceed efficiently without real-time computation delays, resolving the contradiction between thorough deduplication and processing speed.

The patent introduces an intermediary memory buffer between the tape drive and the processing system. Data is read sequentially from tape into this intermediary memory, where parallel processing and deduplication operations occur. This intermediary layer decouples the sequential nature of tape access from the parallel processing requirements, maintaining hardware simplicity while dramatically improving effective access speed through overlapping I/O and computation.

The patent transitions from single-threaded sequential processing to multi-dimensional parallel processing by implementing multiple worker threads that simultaneously process different data chunks. This dimensional change in processing architecture allows the system to maintain simple sequential tape hardware while achieving high-speed processing through parallel operations in the computational dimension.