Cache control method and device for solid state hard disk

Abstract

The invention discloses a method and a device for solid-state drive cache control. The method includes adding a current timestamp for a to-be-cached file and inserting the current timestamp into a level1 db(database); adding 1 to the total data mount of the level1 db and adding 1 to the target cumulant which is of the current timestamp; judging whether the target cumulant is larger than a first preset value, if so, then inserting the new timestamp as the current timestamp; if not, then judging whether the current total data amount is larger than a second preset value or not, if so, then deleting a cache file corresponding to the earliest timestamp while updating the current total data mount. Whether to delete the cache file is determined according to the total data amount of the current database; the deleted cache file is the file corresponding to the earliest timestamp so as to maintain usage rate of the solid-state drives at the stable level without major fluctuations. Besides, by the method and the device, bulk deletion can be realized and cache efficiency can be improved.

Description

technical field [0001] The invention relates to the technical field of data storage, in particular to a cache control method and device for a solid-state hard disk. Background technique [0002] In the field of data storage technology, especially distributed storage, it is necessary to read a large number of files. If it is read directly from the mechanical hard disk, it will take too long. Therefore, the existing method is usually to cache the data in the mechanical hard disk to When the leveldb database in the solid state disk needs to be read, it is directly taken out from the solid state disk, and then read through the memory. [0003] Since the role of the solid-state drive is a secondary cache, the utilization of the solid-state drive is very important. If there is a large amount of useless data in the solid-state drive, when a new data cache is required, the cache space of the solid-state drive is insufficient. It can be seen that it is very important to improve the ...

AI Technical Summary

Problems solved by technology

It can be seen from the examples that the current solutions in the industry make the utilization rate of the solid-state hard disk not constant within a certain range, but fluctuates seriously up and down, which seriously leads to the underutilization of the solid-state hard disk, and even the disk utilization rate reaches 100%. %

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