Dynamically controlling tape velocity
AssigneeInternational Business Machines Corporation
InventorsNhan X. Bui, Kevin B. Judd, Roger J. Justo, Hirokazu Nakayama, Tomoko Taketomi
Life of this patent
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Abstract
A maximum velocity is dynamically determined during a tape drive operation to obtain a statistical standard deviation of a position error signal (PES) that yields an amount of stopwrite (SW) operations that avoids backhitching. The tape velocity is adjusted to the maximum velocity.
Claims21
A method for controlling tape velocity using a processor device, the method comprising:
- dynamically determining a maximum tape velocity during a tape drive operation to obtain a statistical standard deviation of a position error signal (PES) that yields an amount of stopwrite (SW) operations that avoids backhitching by calculating a linear relationship between the tape velocity and the statistical standard deviation;
- and
- adjusting the tape velocity by recursively lowering the tape velocity until the statistical standard deviation of the PES is calculated.
A system for controlling tape velocity a tape drive, the system comprising:
- a tape head,
- the tape drive, in communication with the tape head, and
- a processor device, controlling the tape head and the tape drive, wherein the processor device:
- dynamically determines a maximum tape velocity during a tape drive operation to obtain a statistical standard deviation of a position error signal (PES) that yields an amount of stopwrite (SW) operations that avoids backhitching by calculating a linear relationship between the tape velocity and the statistical standard deviation, and
- adjusts the tape velocity by recursively lowering the tape velocity until the statistical standard deviation of the PES is calculated.
A computer program product for controlling tape velocity by a processor device, the computer program product comprising a non-transitory computer-readable storage medium having computer-readable program code portions stored therein, the computer-readable program code portions comprising:
- a first executable portion that dynamically determines a maximum tape velocity during a tape drive operation to obtain a statistical standard deviation of a position error signal (PES) that yields an amount of stopwrite (SW) operations that avoids backhitching by calculating a linear relationship between the tape velocity and the statistical standard deviation;
- and
- a second executable portion that adjusts the tape velocity by recursively lowering the tape velocity until the statistical standard deviation of the PES is calculated.
Dependencies are inferred from the claim text.