Solid state disk and write operation method

Abstract

The invention discloses a solid state disk and a write operation method, and the solid state disk comprises a controller which is connected with a host and is used for receiving the write data from the outside, and comprises a first cache unit for storing the write data; a flash memory which is connected with the controller and is used for receiving the write data transmitted by the first cache unit according to a first instruction of the controller; and a second cache unit which is connected with the controller, stores the write data from the first cache unit as backup data, and transmits the backup data to the flash memory according to a second instruction of the controller, wherein the second instruction is obtained after the flash memory fails to write the data under the first instruction. According to the solid state disk and the write operation method, the write data of the host is firstly stored in the first cache unit before being transmitted to the flash memory and is backed up to the second cache unit, so that the backup data can be continuously called when the write operation fails, and the efficiency and the quality of the write operation are improved by combining the advantages of the first cache unit and the second cache unit, and the broadband demand is reduced.

Description

technical field [0001] The invention relates to the technical field of data storage, in particular to a solid-state hard disk and a writing operation method. Background technique [0002] Solid State Drives (SSD, Solid State Drives) are storage hard drives made of solid-state electronic memory chips, and are mainly composed of a controller, a storage medium, and a cache unit. At present, the most mainstream solid-state hard disk uses flash memory (FlashMemory) as a storage medium to store data, and uses SRAM (Static Random Access Memory) inside the controller or external DRAM (Dynamic Random Access Memory) as a cache. [0003] The minimum write operation unit of the flash memory is a page (page), and its size is different from the data unit of the host interface command. Therefore, when executing the host write command operation, it is necessary to temporarily store the write data in the cache, and then write the write data into the flash memory after integrating the write ...

AI Technical Summary

Problems solved by technology

However, the write operation time of flash memory is very long, so a large capacity cache is required

[0004] At present, for solid-state drives, when SRAM is used as a cache, although SRAM can provide high data read and write bandwidth, it is difficult to provide a large capacity due to the high cost of SRAM. Previously, it was necessary to release part of the cache space of the SRAM. If the write operation failed, the data in the released cache space would be lost. When DRAM is used as the cache, although it can provide a larger capacity, due to its low read and write bandwidth, It is also difficult to meet the high bandwidth requirements of the controller. At the same time, the technology to increase the read and write bandwidth of DRAM is relatively complicated. Adopting this technology will greatly increase the manufacturing cost of solid-state hard drives.

Therefore, the current caching solutions for solid-state drives cannot complete write data operations efficiently and with high quality.

Images