Apparatus and method for controlling transportation of tape medium
AssigneeInternational Business Machines Corporation
InventorsTakashi Katagiri, Yuhko Mori, Yutaka Oishi
Life of this patent
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Abstract
An apparatus, computer readable medium device, and method for controlling transportation of a tape medium. A determination is made whether to execute a backhitch operation in response to writing a data set to tape from the buffer. If not, a determination is made whether a transaction size at which data is transferred from the buffer to the tape is less than a buffer size. If so, then a determination is made of a a new speed and whether a current speed is different from the determined new speed. If so, then a backhitch is initiated.
Claims25
1-21. (canceled)
An apparatus of controlling transportation of a tape medium during data writing to the tape medium, comprising:
- a buffer;
- a controller that performs operations, the operations comprising:
- calculating a first time to write data at a first tape speed level from a tape speed table and considering a first time required to execute a backhitch at the first tape speed level;
- calculating a second time to write data at a second tape speed level from the tape speed table and considering a second time required to execute a backhitch at the second tape speed level;
- and
- using the first tape speed level for operations in response to the second time to write data being less than the first time to write data.
A computer readable medium device including a program executed to control transportation of a tape medium during data writing from a buffer to the tape medium and perform operations, the operations comprising:
- calculating a first time to write data at a first tape speed level from a tape speed table and considering a first time required to execute a backhitch at the first tape speed level;
- calculating a second time to write data at a second tape speed level from the tape speed table and considering a second time required to execute a backhitch at the second tape speed level;
- and
- using the first tape speed level for operations in response to the second time to write data being less than the first time to write data.
A method of controlling transportation of a tape medium during data writing from a buffer to the tape, comprising:
- calculating a first time to write data at a first tape speed level from a tape speed table and considering a first time required to execute a backhitch at the first tape speed level;
- calculating a second time to write data at a second tape speed level from the tape speed table and considering a second time required to execute a backhitch at the second tape speed level;
- and
- using the first tape speed level for operations in response to the second time to write data being less than the first time to write data.
Dependencies are inferred from the claim text.