Solid state disk (SSD) and read-modify-write operation data management method thereof

Abstract

The invention is suitable for the field of Solid state disks (SSD) and information storage, and provides an SSD and a read-modify-write operation data management method thereof. The data management method comprises the following steps that: the SSD receives a logic block address write command of a host; a microprocessor of the SSD allocates a page buffer region for the logic block address write command, and constructs a host write operation request, a memory page read operation request and a memory page write operation request which have a synchronization mechanism based on the page buffer region, wherein the memory page read operation request containing a configurable direct memory for accessing desired data transmission description; and a serial hardware driver interface and a memory controller of the SSD executes host write operation, memory page read operation and memory page write operation according to the synchronization mechanism. The method provided by the invention can be used for lowering the degree of participation of the microprocessor, saving the memory bus bandwidth and improving the read-modify-write operation performance without adding extra buffer regions.

Description

technical field [0001] The invention relates to the fields of solid-state hard drives and information storage, in particular to a solid-state hard drive and a data management method for read-modify-write operations thereof. Background technique [0002] Solid-state hard drives mainly include microcontrollers and flash memory units. At present, the flash memory units of solid-state hard drives mainly use NAND FLSH (a type of flash memory) chips. The read-write unit of NAND FLASH particles is generally a whole page, such as 8KB; while the read-write unit of the file system The write unit only uses 512B due to historical reasons. Due to the mismatch between the two and the characteristics that NAND FLASH must be erased before writing, the problem of RMW (read-modify-write operation) arises. For example, if the file system wants to modify the content of LBA_i, the SSD needs to read out the NAND FLASH physical page where LBA_i is located, modify the content of the location where...

AI Technical Summary

Problems solved by technology

Its advantages are: simple implementation and no consumption of additional memory bus bandwidth; its disadvantages are: serialization of read-modify operations, low performance, and the microcontroller needs to participate in the whole process

Its advantages are: parallelization of read-modify operations, and its disadvantages are: independent read and modify buffers are required; merging operations need to consume additional memory bus bandwidth and time; microcontrollers need to participate in the entire process

[0005] In summary, the existing data management method of read-modify-write operation of solid-state hard disk is obviously inconvenient and defective in actual use, so it is necessary to improve it

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