Patent ID: 8166242
Filing Date: 2012-04-24
Classification: G06F

Abstract:
1. A distributed disk cache system comprising: a storage divided into a plurality of data areas; a cache server caching one or a plurality of data areas of the storage; an access apparatus accessing the storage or the cache server via a network; a monitoring apparatus connected to the network, monitoring access from the access apparatus to the storage via the network, and caching a data area to the cache server, the data area having a concentration level of the access exceeding a first threshold; an information management table storing a control information for controlling continuation of the caching of the data area cached to the cache server, the control information being set for each data area; and an information accumulation table storing statistical information of the data area cached to the cache server, the statistical information generated by statistically processing a result of monitoring the access from the access apparatus to the storage, wherein the monitoring apparatus stores a control information of a data area cached to the cache server in the information management table when the data area is cached to the cache server, updates statistical information of the data area cached to the cache server in the information accumulation table at a time interval of the control information of the data area cached to the cache server, and monitors whether the concentration level of the access to the storage exceeds the first threshold and whether the concentration level of the access to the cached data area is below a second threshold based on the updated statistical information of the data area cached to the cache server.