APPARATUS AND METHOD FOR CONTROLLING DATA WRITING TO A TAPE MEDIUM
First Claim
1. An apparatus for writing data to a tape medium, comprising:
- a storage unit that stores mode information indicating a data rate of the apparatus; and
a determination unit that determines to write a target amount of data to the tape medium responsive to the mode information indicating a particular data rate, wherein the target amount of data is calculated based on a nominal capacity of the tape medium minus a data capacity lost due to a backhitchless data writing.
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Accused Products
Abstract
Data of a target capacity calculated by a nominal capacity of a tape medium minus a data capacity lost due to execution of backhitchless writing is written to the tape medium. In a tape drive, a command processing unit 41 receives a synchronization command, and a buffer management unit passes data in a buffer to a channel input-output unit. Upon completion of writing the data to the tape, a backhitch determination unit determines whether a mode information storage unit stores information indicating that a high data rate mode is on, whether data of a target capacity can be written to the tape, and whether the written data can be read at a target read data rate. An operation signal output unit issues a command to execute backhitch in case these conditions are not satisfied.
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Citations
20 Claims
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1. An apparatus for writing data to a tape medium, comprising:
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a storage unit that stores mode information indicating a data rate of the apparatus; and a determination unit that determines to write a target amount of data to the tape medium responsive to the mode information indicating a particular data rate, wherein the target amount of data is calculated based on a nominal capacity of the tape medium minus a data capacity lost due to a backhitchless data writing. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus of controlling data writing to a tape medium, comprising:
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a storage unit that stores mode information indicating a data rate of the apparatus; and a determination unit that determines to write a target amount of data to the tape medium without executing backhitch after writing first data to the tape medium until writing second data next to the first data, wherein the mode information indicates a particular data rate, a read data rate for the tape medium satisfies a target read rate, and the target amount of data is calculated based on a nominal capacity of the tape medium minus a data capacity lost due to a backhitchless data writing.
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9. A method of writing data to a tape medium, comprising:
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storing mode information indicating a data rate of the apparatus in a memory; and writing a target amount of data to the tape medium responsive to the mode information indicating a particular data rate, wherein the target amount of data is calculated based on a nominal capacity of the tape medium minus a data capacity lost due to a backhitchless data writing. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A computer program product for writing data to a tape medium, the computer program product comprising computer program embodied on a data storage medium and configured to cause a tape storage system to:
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store mode information indicating a data rate mode of the system in a memory; and determine to write a target amount of data to the tape medium when the mode information indicates a particular data rate, and the target amount of data is calculated based on a nominal capacity of the tape medium minus a data capacity lost due to a backhitchless data writing. - View Dependent Claims (17, 18, 19, 20)
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Specification