A method for reconstructing an L2P table and a related device

Abstract

The invention discloses a method for reconstructing an L2P table, which comprises the following steps: when an SSD is abnormally powered on, obtaining a power-down count flag of a memory block of thelast scratched L2P table from a nonvolatile memory; when the SSD is abnormally powered on, obtaining a power-down count flag of the memory block of the last scratched L2P table from the nonvolatile memory; judging whether the power-down counting flag is the same as the updated power-down counting flag; if so, brushing the L2P table from the nonvolatile memory into the volatile memory; if not, theL2P table is brushed from the nonvolatile memory to the volatile memory, and the L2P reconstruction process is performed according to the L2P table to obtain the reconstructed L2P table. Whether the complete L2P table is saved in the nonvolatile memory is judged by the obtained power-down count flag, and then the corresponding operation is carried out on the L2P table, so as to improve the recovery speed and stability of SSD abnormal power-up. The invention also discloses an L2P table reconstruction device, an abnormal power-down processing method of SSD, an abnormal power-down processing device, a device and a computer-readable storage medium, which have the above beneficial effects.

Description

technical field [0001] The present application relates to the field of computer technology, and in particular to a method for rebuilding an L2P table, a rebuilding device, a method for processing abnormal power-off of SSD, a device for processing abnormal power-off, a device, and a computer-readable storage medium. Background technique [0002] When using SSD (Solid State Drives) to store data content, you need to use FTL (FlashTranslation Layer) mapping table, also called L2P table (Logical To Physical Table logical block to physical block mapping table), used for Record the mapping relationship between the host logical address space (LBA Logical Block Address logical block address) and the Flash flash memory physical address space (PBA Logical Block Address logical block address). Specifically, the L2P table is a sequential table with the LBA as the index and the PBA as the content. When the SSD is working, it will write each piece of user logic data to the flash memory a...

AI Technical Summary

Problems solved by technology

That is, the L2P table is reconstructed by PBA full-disk scan, but the reconstruction time is proportional to the SSD capacity. If it is a 2TB SSD, the deep recovery time can reach several hours, which greatly affects the performance of the SSD.

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