Method and system for constructing disk cache based on nonvolatile memory of log file system

Abstract

The invention provides a method and system for constructing a disk cache based on a nonvolatile memory of a log file system. The method comprises that: nonvolatile memory cache comprises nonvolatile memory data cache and nonvolatile memory metadata cache; in the initialization stage of the nonvolatile memory cache, a shutdown mark set in the nonvolatile memory is checked, and when it is checked that shutdown is not normal shutdown, the nonvolatile memory cache executes fault recovery operation to guarantee system consistency; and after initialization of a nonvolatile memory cache is completed,data submission is executed in the data cache, metadata submission operation is executed in the metadata cache, when the storage space of the nonvolatile memory cache is insufficient, data write-backoperation is executed by the data cache, and metadata write-back operation is executed by the metadata cache. Double writing of data is avoided, write amplification of metadata is reduced, and the overall performance of the system is improved.

Description

technical field [0001] The present invention relates to a non-volatile memory cache, in particular to a method and system for constructing a disk cache based on a non-volatile memory of a log file system, and more specifically to a non-volatile memory based on a log file system cache. Background technique [0002] A log file system is a file system that uses a separate disk as a log or divides an area from the disk as a log. In a normal file system, data is written directly back to disk and overwrites the original data. However, since the atomic write granularity of data is smaller than the data block size of the file system, if a failure such as power failure or system crash occurs during the process of writing data to the disk, only a part of the data on the disk will be updated, resulting in the consistency of the file system. . In order to solve this problem, the journal file system came into being. Its idea is to record the data to the pre-set log area before writin...

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Problems solved by technology

However, since the atomic write granularity of data is smaller than the data block size of the file system, if a failure such as power failure or system crash occurs during the process of writing data to the disk, only a part of the data on the disk will be updated, resulting in the consistency of the file system.

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