SYSTEM AND METHOD OF TIME-BASED CACHE COHERENCY MAINTENANCE IN USER FILE MANAGER OF OBJECT-BASED STORAGE SYSTEM

摘要

A system and a method for maintaining time-based cache coherency of a user file manager in an object-based storage system are provided to enable each user file manager to individually maintain the time-based cache consistency by considering that the cache is valid for a predetermined time based on cached metadata and caching time of the data. A write-back cache(320) stores the metadata and the data. A timer(331) records storage time of the write-back cache. A metadata cache controller(330) fetches the metadata data stored in the write-cache over the predetermined time from a metadata management server(350). A data cache controller(332) fetches the data stored in the write-cache over the predetermined time from the object-based storage device(351). The write-back cache comprises a metadata cache and a data cache(323). The metadata cache comprises a dentry cache(321) and an inode cache(322) respectively storing dentry information and inode information.