Device and method for controlling writing of data

A data writing and data technology, applied in data recording, recording/reproduction/deletion methods, digital recording, etc., can solve the problem of write performance degradation
CN102714047AActive Publication Date: 2012-10-03IBM CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
IBM CORP
Publication Date
2012-10-03

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Abstract

Provided are a device and method for controlling writing of data, whereby a target amount of data is written to a tape medium, said target amount being a nominal capacity minus an amount of capacity lost by not backhitching. In the provided tape drive controller (16), when a command processing unit (41) receives a synchronization command, a buffer management unit (42) hands over data from a buffer to a channel I / O unit (43), and a write to a tape finishes, a backhitch determination unit (44) then determines whether the following conditions are fulfilled: information indicating a high-data-rate mode is stored in a mode information storage unit (45); of a nominal capacity, it is possible to write a target amount of data to the tape, said target amount being stored in a target amount storage unit (46); and it is possible to read the written data at a target read-out data rate. An operation signal output unit (48) gives an instruction to backhitch only in the case in which it is determined that the aforementioned conditions are not fulfilled.
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Description

technical field

[0001] The invention relates to a device and method for controlling data writing. In particular, the present invention relates to apparatus and methods for controlling the writing of data to tape media. Background technique

[0002] For example, based on LTO (Linear Tape Open), a tape drive for writing data to a tape medium such as a magnetic tape may periodically receive a synchronization command from a host (application) during data writing. The synchronization command is a command for forcibly writing data stored in a buffer in the tape drive to the tape medium. The purpose of periodically receiving the synchronization command in this way is to know (want to ensure) that all the data sent by the application program to the tape drive is written into the tape medium without remaining in the buffer in the tape drive.

[0003] After the tape drive receives a sync command, the buffers within the tape drive become empty, so the tape drive typically "backs off"...

Claims

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