Tape storage device and writing method thereof

A storage and write request technology, applied in information storage, recording information storage, tape-like record carriers, etc., can solve the problems of data capacity reduction and recording density reduction, and achieve the effect of improving data recording density

Active Publication Date: 2015-12-16
IBM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If there is a gap, the recording density will decrease, so the capacity of the data written on the tape medium will decrease.

Method used

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  • Tape storage device and writing method thereof
  • Tape storage device and writing method thereof
  • Tape storage device and writing method thereof

Examples

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Embodiment Construction

[0061] Hereinafter, some typical embodiments (hereinafter referred to as "embodiments") will be described regarding the method of writing data (files, transactions) to a tape drive according to the present invention. These examples are illustrative and do not limit the selection method of the present invention.

[0062] image 3 Indicates that an error occurred when the DS# of the separate file A and subsequent file B was not written. If two FMs are accommodated in one data set, the tape drive will generate duplication work when writing file A and two FMs. If all of them are filled in DS#N, the last FM will be overwritten and deleted, and it is necessary to rewrite DS#N to write the file B.

[0063] When writing to file B, file B is also added to the empty area of ​​DS#N and written to DS#N. When an error occurs while writing file B, it is guaranteed that the data already written in file A will be lost. There, when a write error occurs, it is considered to write B to anoth...

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Abstract

A mechanism is provided for tape writing of small transactions. A first file is written as a plurality of fixed-length data sets (DS), the DS number of the final DS in the plurality of DS is stored in memory as #N(DS#N) and the WP number as #M(WP#M), and the final first file and the second file in the DS following the final DS(DS#N, WP#M) containing the first file are packed and written in sequential DS units, and are stored as DS#N, DS#N+1, etc, and WP#M+1 in sequential order in DS containing the second file. The remaining first, second, or third file is packed and DS#N with WP#M is overwritten as DS#N with WP#M+2, and the remaining #N in the DS numbers of the second file and the third file in the subsequent DS are written as DS#N+1, N+2, etc. with WP#M+2, and the DS#N, #N+1, #N+2, etc. with WP+M+2 are stored.

Description

technical field [0001] The present invention relates to a method of writing to tape, and in particular, to a writing method and a tape recording device (tape drive) when small transactions are requested for tape writing. Background technique [0002] A typical example of the tape drive is an LTO (LinearTape_Open: Linear Tape Open) tape drive, an IBM tape drive TS1130, or the like. Tape media used in tape drives are broadly classified into two types: a data cartridge and a WORM (Write Once Read Many: Write Once Read Many) cartridge. For example, a CD as a recording medium will be described. The two cases correspond to CD-RW (Compact Disc-Rewritable: Compact Disc Rewritable) and CD-R (Compact Disc Recordable: Compact Disc Recordable), respectively. The former can erase / update the one-time saved data, however, the latter cannot. [0003] The host sends variable-length transactions (also called files or data) to the tape drive to record (Write commands). Sent by variable len...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/06G11B20/10
CPCG06F3/0682G06F3/0608G06F3/061G06F3/0619G06F3/0638G06F3/0643G06F3/0652G06F16/178G11B20/1202G11B2220/956
Inventor 大石丰平田崇将渡边辉江增田摄子森祐子
Owner IBM CORP
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