LOGICAL TO PHYSICAL MAPPING MANAGEMENT USING LOW-LATENCY NON-VOLATILE MEMORY

摘要

Disclosed are systems and methods for providing logical to physical (L2P) table management using low-latency NVM to reduce solid state drive (SSD) random access memory (RAM) footprint. A method includes determining a logical to physical (L2P) mapping of a logical address to a physical address in a flash storage, for an operation directed to the logical address. The method also includes adding a data entry, comprising the L2P mapping, to an open journal structure in RAM. The method also includes adding a log entry, comprising the L2P mapping, to a buffer in the RAM. The method also includes flushing the buffer to a low-latency NVM storage in response to determining that the buffer has satisfied a size threshold. Reads, snapshotting and L2P table recovery are also described.