Method for data storage during abnormal power down of computer

Abstract

The invention discloses a method for data storage during abnormal power down of a computer. The method comprises the steps that a PSU gives out power down warning signals to a mainboard CPLD before the power down; the mainboard CPLD sends a request for triggering synchronization to a PCH; the PCH sends a synchronizing signal to all CPUs after receiving the request; each CPU writes data in a Cache into a DRAM after receiving the synchronizing signal, and then sends a write-in completing mark to a controller of a mixed cache after write-up operation; when the controller detects the write-in completing mark, all the data in the DRAM are transferred to an NVM, and a storage completing signal is sent to the PCH after data transfer is completed; the PCH writes in a marking state of abnormal power down shutdown in an internal memory. According to the method for the data storage during the abnormal power down of the computer, when the computer powers down suddenly, running data of the computer can be stored in the NVM, when a system is restarted, the data can be read from the NVM, and reproduction of an accident site can be achieved, and losses of a user are reduced.

Description

technical field [0001] The invention relates to the field of computers, in particular to a method for saving data when the computer is abnormally powered off. Background technique [0002] A general computer storage system is composed of memory and external memory. According to the speed of storage, it is the cache memory inside the CPU, the dynamic random access memory (Dynamic Random Access Memory, referred to as DRAM) memory and the solid state disk (Solid State Disk, referred to as SSD) Or mechanical hard disk external storage, in which Cache and DRAM are composed of volatile storage media, and its main feature is that data cannot be saved after power failure, while SSD or mechanical hard disk is composed of non-volatile storage media (Non-VolatileMemory, referred to as NVM). Data will not be lost after its power failure. When the computer is working, the CPU first obtains data from the Cache, and if there is no data in the Cache, then it will look for it from the DRAM,...

AI Technical Summary

Problems solved by technology

If the system suddenly loses power when the computer is working normally, because the data in the Cache and DRAM are not saved in time, all the data running in the Cache and DRAM will be lost, which will cause huge losses in some key applications

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