POWER DOWN PROTECTION METHOD FOR STORAGE SYSTEM, STORAGE CONTROLLER, AND ELECTRONIC DEVICE

摘要

A power down protection method for a storage system, a storage controller and an electronic device, relating to the technical field of communications, capable of solving the problem that a storage system needs to consume a large amount of time to perform mapping relationship recovery. The method comprises: when the last power down of a CPU was an abnormal power down, a storage controller determining index information about a second-level and third-level mapping table level by level according to index information about a first-level mapping table, and reading mapping relationships of all data in a log buffer area and mapping relationships of all data in a log area; sending the acquired mapping relationships to the CPU; and when at least one piece of data has a mapping relationship in the log buffer area or a mapping relationship in the log area different from a mapping relationship in the third-level mapping table, the storage controller replacing the mapping relationship in the third-level mapping table, and updating the index information about the second-level and first-level mapping tables level by level, and saving a mapping relationship in the updated second-level mapping table that has changed before and after the update to a DRAM. The method is applicable to a storage system.