OPTIMIZED CONTEXT DROP FOR A SOLID STATE DRIVE(SSD)

摘要

The mass storage system employs a paging table for memory page redirection and maintains a paging table for Power Loss Recovery (PLR) using a FIFO queue of paging table (L2P) segments to be written to nonvolatile memory. The FIFO queue identifies the sequence of L2P segments with the sequence number and marking data of the affected segment to regenerate the paging table. Upon power failure, the Power Loss Recovery (PLR) mechanism scans the last segment written based on the FIFO queue. The PLR process recovers uncommitted paging table entries by reproducing the corresponding changes in the order defined by the sequence number. The recovery process continues for each sequence number in the current context until the L2P information of the paging table is regenerated at the point immediately before the power loss.