STORAGE DEVICE AND METHOD FOR SAVING WRITE CACHE DATA

摘要

According to one embodiment, a storage device includes a nonvolatile storage medium, a volatile memory and a controller. The volatile memory includes a cache area and a cache management area. The cache area is used to store, as write cache data, write data to be written to a user data area of the nonvolatile storage medium. The cache management area is used to store management information associated with the write cache data and including a compression size for the write cache data. The compression size is calculated in accordance with reception of a write command. The controller compresses, based on the management information, write cache data which is not saved to a save area and is needed to be compressed, and writes the compressed write cache data to the save area.

主权项

1. A storage device comprising:
a nonvolatile storage medium including a user data area; a volatile memory including a cache area and a cache management area, the cache area being used to store, as write cache data, write data specified by a write command and to be written to the user data area, the cache management area being used to store management information associated with the write cache data and including a compression size for the write cache data, the compression size being calculated in accordance with reception of the write command; and a controller configured to execute save processing of compressing, based on the management information, non-saved write cache data which is not saved to a save area and is needed to be compressed, and writing the compressed write cache data to the save area.