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AssigneeInternational Business Machines Corporation
InventorsShrikant V. Karve, Kushal S. Patel, Sarvesh S. Patel
Estimating the term…
Migrating data in a tiered storage system. The tiered storage system includes an upper tier with at least one storage device and a lower tier with at least one storage device. Data on a storage device includes one or more extents, and each extent contains one or more grains. I/O activity of grains is recorded during a predefined time interval. For each extent, a mean heat value over grains in the extent during the predefined time interval is calculated from the recorded I/O activity, where a heat value is a numerical indication of frequency of access of a grain, and a spike heat indicator, which measures non-uniformity of heat values of grains in the extent is calculated. Two extents with mean heat values that differ at most by a predefined threshold are identified, and the extent with a greater spike heat indicator is migrated to an upper tier.
A computer-implemented method for migrating data in a tiered storage system the method comprising:
A computer system for migrating data in a tiered storage system, the computer system comprising:
A computer program product for migrating data in a tiered storage system, the computer program product comprising:
Dependencies are inferred from the claim text.