SSD critical log inheritance method

The invention relates to the technical field of SSD applications, in particular to an SSD critical log inheritance method. An existing log storage mode causes log loss, and numerous critical process information is lost, so that the problem analysis is very difficult. The SSD critical log inheritance method provided by the invention comprises the steps of defining target logs as critical logs, marking critical log blocks in written log blocks, marking normal log blocks in all-level log blocks, and performing writing; performing level division on the critical log blocks and the normal log blocks, wherein the critical logs are high-priority logs, and normal logs are all-priority logs; and when the log blocks are recorded fully, preferentially recovering the all-priority logs with the earlieststorage time. During log reading, the all-level logs and the critical logs are read; during analysis, the all-level logs are analyzed firstly and then the critical logs are analyzed; and the criticallogs fill up entries lost