Storing data in a stub file in a hierarchical storage management system
AssigneeInternational Business Machines Corporation
InventorsHiroshi Araki, Shinobu Fujihara, Tohru Hasegawa, Takeshi Ishimoto, Hiroshi Itagaki, Hiroyuki Miyoshi, Yutaka Oishi
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Abstract
According to an aspect of the present invention, there is a method, computer program product and/or system for storing data that performs the following operations (not necessarily in the following order): (i) receiving a request to migrate a data file from primary storage to secondary storage; (ii) invoking a primary data extraction function, registered by a user, to determine primary data for the data file; and (iii) inserting the primary data into a stub file.
Claims20
A method for storing data, the method comprising:
- receiving a request to migrate a data file from primary storage to secondary storage;
- invoking a primary data extraction function, registered by a user, to determine primary data for the data file;
- and
- inserting the primary data into a stub file.
A method for retrieving data, the method comprising:
- receiving, from a requester, a request to access primary data for a data file;
- determining if the primary data is in a stub file corresponding to the data file;
- on condition that the primary data is in the stub file, retrieving the primary data from the stub file;
- and
- providing the primary data to the requester.
A method for accessing data, the method comprising:
- determining whether a data file has been migrated to secondary storage;
- retrieving primary data corresponding to the data file from primary storage responsive to determining that the data file has been migrated to secondary storage;
- and
- receiving the primary data.
Dependencies are inferred from the claim text.