Metadata recovery method and device based on SSD, equipment and medium

Abstract

The invention discloses a metadata recovery method and device based on an SSD, equipment and a medium. The method comprises the following steps: when the SSD is powered on and started, retrieving required target metadata in a PBA address interval pre-divided in a FLASH chip of the SSD; wherein the storage space corresponding to the PBA address interval is continuous, and only metadata is stored inthe storage space; and reading the target metadata, and loading the target metadata to a memory chip of the SSD. According to the method, the FLASH chip of the SSD is divided in advance; The PBA address interval obtained through division is continuous, only metadata is stored, the situation that the metadata is interfered by user data in the metadata retrieval process can be avoided, and therefore the metadata retrieval efficiency of the SSD in the power-on recovery process is relatively improved, and the power-on starting efficiency of the SSD is guaranteed. In addition, the invention further provides an SSD-based metadata recovery device, SSD-based metadata recovery equipment and an SSD-based metadata recovery medium, and the beneficial effects are the same as described above.

Description

technical field [0001] The present invention relates to the field of storage, and in particular, to an SSD-based metadata recovery method, device, device and medium. Background technique [0002] SSD, that is, Solid State Disk, referred to as Solid State Disk, is a hard disk made of solid-state electronic storage chip array. It is composed of a control unit and a storage unit (FLASH chip, DRAM chip). One, especially on servers with high performance requirements, SSDs are widely used. Most of the data stored in the SSD is user data, but metadata is required to manage these user data during operation. Therefore, with the continuous increase of SSD capacity, the amount of metadata data also continues to increase. Saving and restoring have become more important issues in SSD work. [0003] The working principle of the current SSD is generally to save the latest metadata in the memory in the FLASH chip when the power is turned off, so as to ensure that even if the SSD stops wor...

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Problems solved by technology

[0004] During the power-on recovery process of the SSD, it is necessary to retrieve the required metadata in the FLASH chip, and when there is a situation that the retrieved metadata is not available, it is also necessary to retrieve the metadata that can replace the metadata in the FLASH chip. Old metadata, but because metadata and user data may be stored in the same block of the current FLASH chip, during the power-on recovery process of the SSD, the retrieval of metadata is often interfered by user data, resulting in The retrieval efficiency of metadata is relatively low, so the time overhead of SSD metadata recovery is often large, and it is difficult to guarantee the startup efficiency of SSD

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