Flash translation layer capable of perceiving RAID (Redundant Array of Independent Disks) and implementation method thereof

Abstract

The invention relates to a flash translation layer capable of perceiving a RAID (Redundant Array of Independent Disks) and an implementation method thereof. An operation identifier which shows the access type of the last-time access on a page and a logic page type identifier which shows whether the page is common data or calibration data are added into each logic page of a flash memory; a block type identifier which shows whether data stored in a block is the common data or the calibration data is added into each physical block of the flash memory; when a certain logic page is accessed, the access type of the last-time access and the access type of current access are compared, and if the access types are both read operation, an indication result shows that the data corresponding to the logic page is the common data; and when the certain logic page is subjected to a write operation, according to the type identification of the page, the page is written into a newly-distributed idle block, the type of the idle block is set to be the same with the type of the page, or the page is directly written into a physical block which is the same as the page in type. The flash translation layer is low in expenditure, reduces a data size migrated in a garbage collection process, and reduces writing to the flash memory so as to prolong the service life of the flash memory.

Description

technical field [0001] The invention is applicable to the technical field of flash memory solid-state storage, and provides a method and system for automatically separating hot and cold data capable of realizing RAID based on flash memory, and a flash memory. Background technique [0002] Flash memory (FlashMemory) is a semiconductor memory that has been widely used in recent years. The development of flash memory technology has caused new changes in the storage field. Flash memory has small size, light weight, no noise, anti-vibration, low power consumption (its energy consumption is only 1 / 5~1 / 6 of traditional hard disk), fast read and write speed (more than twice that of ordinary disk) and operating temperature The advantage of a large range is an ideal storage medium. [0003] An important feature of flash memory is that it cannot be over-written when modifying data, that is, when a page of data needs to be modified, it cannot be directly modified in place like a disk, ...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the design is complex and the overhead is relatively large. It is necessary to modify the RAID controller and provide a non-volatile storage medium as a Cache to ensure that data is not lost.

At the same time, more logic is needed to manage and optimize the Cache, and good results cannot be guaranteed, and it is application-dependent

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