data flashing method, device and apparatus of storage system and readable storage medium

The invention discloses a data flashing method of a storage system. When transaction log synchronization is carried out on metadata, a synchronously written transaction log is asynchronously written into a disk; namely, cache data which do not fall into the disk is written into the disk; on the premise of double-control transaction log backup, an asynchronous overwriting log mode is added to improve the reliability of the storage system. Under the condition of writing the asynchronous log, even if more serious faults happen, memory data cannot be written into a disk in time, part of data and even all data can still be effectively recovered when the controller is recovered, the situation of data loss under extreme conditions is reduced, and the reliability of the storage system can be effectively improved under the situation that IO efficiency is not greatly affected. The invention furthermore provides a data flashing apparatus and device of the storage system and a readable storage medium, which have the abov