Technology for preserving and recovering mapping table information of high-reliability solid state storage equipment

Abstract

The invention discloses a technology for preserving and recovering mapping table information of high-reliability solid state storage equipment. In order to guarantee that a mapping table can still be reconstructed when a mapping table preservation area is abnormal and then to guarantee reliability of storage equipment based on a flash memory, the technology includes the steps that all change operations, such as writing, erasing and deleting are numbered (Sequence Number), logical block numbers and Sequence Number are preserved in a clear area of a flash memory physical page, deletion operation and Sequence Number are recorded, and high reliability of products can be guaranteed by scanning the clear area of the physical page and scanning deletion operation records to reconstruct the mapping table when the mapping table is abnormal and cannot be recovered. By the implementation of the technology, reliability of the storage equipment based on the flash memory can be guaranteed, and even data can still be effectively recovered when the flash memory locally suffers from mechanical damage.

Description

technical field [0001] The invention relates to the technical field of computers and peripheral accessories thereof, in particular to computer peripheral storage devices based on flash memory chips. Background technique [0002] In order to effectively manage the bad blocks of flash memory and prolong the life of storage devices based on flash memory through the average wear algorithm; establishing and maintaining the mapping table of logical blocks and physical blocks (pages) is almost all similar devices must be implemented basic skills. For the storage of mapping table information, the current technology mainly saves the mapping table through operation logs, timing or event-driven. However, since the write operation of the flash memory is performed on a page-by-page basis, no matter whether it is writing a log or saving the mapping table, it is impossible to perform real-time operations. It is necessary to wait until the records accumulate to a certain number before trig...

AI Technical Summary

Problems solved by technology

However, since the write operation of flash memory is performed on a page-by-page basis, no matter whether it is writing a log or saving the mapping table, it is impossible to perform real-time operations. It is necessary to wait until the records accumulate to a certain number before triggering the write operation of the flash memory to save. Otherwise, the life of the product will be shortened due to frequent operation

However, once some abnormal conditions occur, such as abnormal power failure or bad blocks in the management area, etc., it may cause data loss or system crash

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