| 摘要 |
The present invention carries out cache management in such a manner that the management region required for cache management does not increase, and neither does the performance decline. It is possible to combine use of both a hierarchical directory method and a hash directory method, in order to manage cache data. In a hierarchical directory method, the desired data is retrieved by referring to respective tables T 1 to T 7, in succession. In a hash directory method, the desired data is reached by referring to a hash table T 10 and tables T 4 to T 7. Access conflicts between the respective methods are avoided by using the EDEV number and a portion of the VDEV number for a hash key. By combining use of both of these methods, it is possible to respond to cases where the storage capacity of the storage system has been increased, without having to raise the management region, and without causing a decline in performance.
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