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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

Active Publication Date: 2012-10-03
IBM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The writing of subsequent data becomes after the retreat ends, therefore, frequently receiving synchronous commands will lead to a significant decrease in the performance of writing

Method used

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  • Device and method for controlling writing of data
  • Device and method for controlling writing of data
  • Device and method for controlling writing of data

Examples

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Embodiment Construction

[0036] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0037] figure 1 It is a schematic diagram of a configuration example of the tape drive 10 to which this embodiment is applied. This tape drive 10 includes a host interface (hereinafter, referred to as “host I / F”) 11 , a buffer 12 , channels 13 , a head 14 , and a motor 15 . In addition, a controller 16 , a head position control system 17 , and a motor driver 18 are included. Furthermore, since the tape cassette 20 can be loaded by insertion into the tape drive 10, the tape cassette 20 is also shown here. This tape cassette 20 includes a tape 23 wound around reels 21 and 22 . The belt 23 moves in the longitudinal direction from the reel 21 to the reel 22 or from the reel 22 to the reel 21 as the reels 21 and 22 rotate. In addition, the tape 23 may be exemplified as a magnetic tape, or may be a tape medium other than a magnetic tape.

[0038] Here, the host...

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PUM

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B20/10G11B15/087G11B15/20
CPCG11B5/09G11B20/10527G11B15/20G11B2020/10759G11B5/00821G11B2220/90
Inventor 片桐隆司中山浩一大石丰吉村克巳名仓宽尚安部敦
Owner IBM CORP
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