Realization method for NVMe extension and solid state disk

Abstract

The invention discloses a realization method for NVMe extension and a solid state disk. The method is characterized by comprising the steps of querying a no-map management table in the SSD according to a logic space of a command after the SSD receives the reading command of a host, judging whether the command is a no-map command or not, and if yes, directly setting a map status bit used for identifying whether no map exists or not in a completion queue entry to be 1, directly ending the command and performing return to the host; otherwise, reading data according to a logic space address of thecommand, and after the reading is finished, setting the map status bit to be 0 and performing return to the host; and after the host receives the completion queue entry, interpreting whether the mapstatus bit is 1 or not, and if yes, directly setting a cache corresponding to the command to be 0 by the host and performing return and application or direct return and application. By optimizing thereading processing process, data transmission between the SSD and the Host is reduced, so that the command response delay and the service time are greatly shortened and the actually measured bandwidthcan effectively break through physical limitation of PCIe.

Description

technical field [0001] The invention relates to the field of storage technology, in particular to a method for implementing NVMe expansion and a solid-state hard disk. Background technique [0002] SSD (Solid State Drive) has been widely used in various occasions. As the performance requirements of PCs increase, the performance of storage devices, one of the key factors, is a key factor affecting overall performance. [0003] Through the analysis of the test models of some mainstream performance test tools, we found that a data type greatly affects the test results. This special data is called No-Map (no mapping) data, which means that there is no valid data in the corresponding logical space. [0004] This kind of scenario occurs mainly because the SSD has never written data after leaving the factory or the host side has discarded the data in it through special commands (TRIM, Security Erase, etc.). For this kind of data, the host only expects it to return specific data (...

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Problems solved by technology

Therefore, the existing processing flow still has a large room for improvement

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