Implementation of metadata logging and power loss recovery for page-mapping FTL

In NAND flash systems, the mapping table and related metadata information of FTL should be recovered from sudden power loss to provide data consistency. Nowadays, a lot of FTLs have been reported, however, there are little development reports for FTL recovery schemes. In this paper, we design fast metadata logging and recovery scheme to support efficient and fast power loss recovery. The designed recovery scheme is based on the page-level mapping FTL. In the designed FTL, All the metadata changes are logged into dedicated flash block, which minimize the frequency of metadata updates. At the recovery stage, only metadata blocks are retrieved. The designed FTL metadata logging and recovery scheme support fast sudden power loss recovery, with small amount of metadata logging overhead.