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Disclosed is a hierarchical data archive system forecasting the best timing of cache-out or cache-in by utilizing information associating to each data such as the time singularity of the concern to the data.
English (United States)
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Data archive system of more efficient cache utilization and hit ratio
A typical hierarchical data archive system optimizes data access speed by equipping high-speed storage device like hard disks as a data cache between the host computer and lower layer storage devices like tape library. Since high-speed cache device has a restriction in capacity and cost per bit as compared with lower layer low-speed devices, the system choose and move data which may not be accessed for a while to lower layer storage. If the data is already stored in the lower devices, the system just discards the data from cache. Moreover, when the host requests the data but the date does not exist in cache, moving data is performed into cache from lower layer storage.
The system of present technology has opted for selection of the data to be cached out, by calculating statistics information on the past, such as LRU (Least Recently Used) or reference count to each data. About cached in, it moves the data if needed (i.e. On Demand).
2. Summary of Disclose
Disclosed system improves access time of the archived data by increasing cache hit ratio with annexing the feature and singularity of data as an associating information tag, and utilizing the information for the judgment of moving or discarding a data from cache earlier than the other, and which data should be recalled from lower storage ahead from the host request.
The feature and singularity of data are the facts which owner of the data already knows, for example, monthly or yearly accounts data are supposed to assess frequently at the end of the month or the end of a fiscal year.
As other examples, the weekend holiday information is accessed frequently around prior to weekend. The information of the Year End o...