Large-capacity solid state disk mapping method

Abstract

The invention discloses a large-capacity solid state disk mapping method. The method is characterized by comprising the steps of dividing a logic address space accessed by a host into N sub logic address spaces same in size; correspondingly dividing a physical space of a solid state disk into N sub physical spaces same in size, which correspond to the sub logic address spaces, wherein N is 2n; separately maintaining a sub logic mapping table for each sub physical space and each sub logic address space; and searching for or updating the corresponding sub logic mapping table according to the sublogic address space which a logic address of the host belongs to during access of the host. By adding a partition mechanism, the mapping table is established for each partition, so that the problem of DRAM demand increment caused by 32bit deficiency of mapping table items is solved, the cost is reduced and the mapping table access efficiency is improved.

Description

technical field [0001] The invention relates to solid-state hard disk control technology, in particular to a large-capacity solid-state hard disk mapping method. Background technique [0002] SSD (Solid State Drive) has been widely used in various occasions, and its application scenarios extend from Client applications to enterprise-level Enterprise applications. [0003] Under the Client application model, since the existing HDD is mainly replaced, under the equivalent performance requirements, the SSD capacity requirement is not large. In enterprise-level applications, there are certain requirements for large-capacity SSDs (such as 2TB, 4TB, 8TB, 16TB, etc.). Furthermore, for enterprise-level large OP products, when the visible capacity of the host is 8TB, the physical capacity is often much larger than 8TB, for example, 12TB. [0004] In the traditional SSD of 4KB flat address mapping mode, a 4KB host logical address will be mapped to the physical address of the SSD, us...

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Problems solved by technology

[0008] For the above defects, the purpose of the present invention is how to solve the problem of doubling the DRAM demand caused by simply increasing the space mapping range by expanding the mapping table due to the rise of the FLASH physical capacity

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