Method and device for abnormal power-down data protection of non-volatile memory

Abstract

The present invention provides a method and device for abnormal power-down data protection of a non-volatile memory. The method comprises steps of detecting whether or not an abnormality occurs in a power signal of a PSU; when an abnormality occurring in the power signal of the PSU, switching BBU to supply power, and simultaneously sending a configuration command before shutdown; when it is detected that the configuration is completed before the shutdown, sending a power-off command to turn off other power source units, and sending an instruction to store cache data in the non-volatile memory;on the basis of the non-volatile memory, a battery backup unit is added to ensure that the cached data is stored in the non-volatile memory in time under an abnormal power-down condition to prevent data loss, which fills the blank in related technical fields in China, and a super capacitor is not added to affect board card space and memory density.

Description

technical field [0001] The invention relates to the technical field of computer storage, in particular to a data protection method and device for abnormal power failure of non-volatile memory. Background technique [0002] Non-volatile memory is one of the new directions of server design exploration at present. Different from conventional DDR DRAM, the data of non-volatile memory can be completely stored in memory after power failure. The current non-volatile memory mostly uses Flash as the storage medium. Since the read and write speed of Flash is much slower than the response speed of the memory controller, a first-level cache is generally added between the memory controller and the non-volatile memory to alleviate the two problems. Due to the difference in speed, the data interacts between the memory controller and the non-volatile memory through the cache, which not only has data non-volatility, but also takes into account the performance of data reading and writing. Si...

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Problems solved by technology

[0003] In the X86 field, the existing technical solutions are mainly monopolized by foreign manufacturers, using the non-volatile memory sticks of foreign manufacturers plus a super capacitor solution. When an abnormal power failure occurs, the external super capacitor starts to be a non-volatile memory stick, which can realize Electronic data protection, but the domestic technology is still blank

In addition, the solution of using a non-volatile memory module plus a super capacitor is currently in the verification stage. Due to the limited power of the super capacitor, generally speaking, a non-volatile memory needs to be equipped with a super capacitor, which sacrifices the limited capacity of the board to a certain extent. space, there are great restrictions on the density of on-board memory, and the structural design will also face great challenges

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