Device and method of controlling disk cache by identifying cached data using metadata

摘要

Provided are a device and method of controlling a dish cache, wherein a time of seeking a disk cache may be shortened and a hit rate of a disk cache may be increased. The device includes a main memory including a buffer cache, a flash memory including a flash cache, and a controller controlling the buffer cache and the flash cache, wherein the buffer cache and the flash cache are enabled to cache a data block stored in a disk, and the controller identifies a position where the data block is cached using metadata.

主权项

1. A device of controlling a disk cache, comprising:
a main memory including a buffer cache; a flash memory including a flash cache; and a controller controlling the buffer cache and the flash cache, wherein the buffer cache and the flash cache are enabled to cache a data block stored in a disk, and the controller, using metadata, determines whether a targeted data block is cached in the buffer cache or the flash cache using a file identifier of a file to which the targeted data block belongs and an offset information of the targeted data block within the file and identifies a position where the data block is cached, the metadata comprises a list of a file identifier of a file to which cached data blocks belong and block information regarding the cached data blocks.