Locating data within tape systems using sub dataset headers
AssigneeInternational Business Machines Corporation
InventorsTsuyoshi Miyamura, Setsuko Masuda, Keisuke Tanaka
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Abstract
Aspects of the present disclosure relate to a method of writing a dataset to a tape, the dataset comprising a plurality of sub datasets, each sub dataset including a plurality of headers and a plurality of records. The method includes storing, in each header of each sub dataset, at least a portion of a record range indicator indicating a range of records included in the dataset.
Claims20
A method of writing a dataset to a linear file tape system (LFTS) tape, the dataset including a plurality of sub datasets, each sub dataset including a plurality of headers and a plurality of records, the method comprising:
- storing, in each header of each sub dataset, a record range indicator indicating a range of records included in the dataset, wherein record range indicators are used to locate target records based on received reposition requests.
A system comprising:
- one or more processors;
- and
- one or more computer-readable storage media collectively storing program instructions which, when executed by the one or more processors, are configured to cause the one or more processor to perform a method of writing a dataset to a linear file tape system (LFTS) tape, the dataset including a plurality of sub datasets, each sub dataset including a plurality of headers and a plurality of records, the method comprising:
- storing, in each header of each sub dataset, a record range indicator indicating a range of records included in the dataset, wherein record range indicators are used to locate target records based on received reposition requests.
A computer program product comprising one or more computer readable storage media, and program instructions collectively stored on the one or more computer readable storage media, the program instructions comprising instructions configured to cause one or more processors to perform a method of writing a dataset to a linear file tape system (LFTS) tape, the dataset including a plurality of sub datasets, each sub dataset including a plurality of headers and a plurality of records, the method comprising:
- storing, in each header of each sub dataset, a record range indicator indicating a range of records included in the dataset, wherein record range indicators are used to locate target records based on received reposition requests.
Dependencies are inferred from the claim text.