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A memory and writing request technology, which is applied in the direction of information storage, record information storage, tape-like record carrier, etc., can solve the problems of data capacity reduction and recording density reduction, and achieve the effect of increasing data recording density
Active Publication Date: 2013-01-30
IBM CORP
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If there is a gap, the recording density will decrease, so the capacity of the data written on the tape medium will decrease.
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[0061] Hereinafter, some typical embodiments (hereinafter referred to as “examples”) regarding the method of writing data (files, transactions) to a tape drive according to the present invention will be described. 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 another ...
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Abstract
Disclosed is a tape writing method for small transactions. For a data set of fixed length, (step 1) a first file is written as a plurality of DSs, and the DS number and the WP number of the last DS are stored into memory as #N (DS#N) and #M (WP#M), respectively; and (step 2) into the DS which follows the last DS (DS#N, WP#M) that includes the first file, the last first and second files are packed and sequentially written in units of DSs, and into the DS which includes the second file, DS#N, DS#N+1, ..., and WP#M+1 are sequentially stored into memory. (Step 3) The remainder of the first, second, and third files are packed, and with DS#N at WP#M+2, the DS#N of WP#M is appended onto, and for after the DS number of the second and third files, the remaining portion of the #N is written as following DSs as DS#N+1, DS#N+2, ..., at WP#M+2. With DS#N, #N+1, #N+2, ..., the WP#M+2 is stored into memory.
Description
technical field [0001] The present invention relates to a method of writing to a tape, and in particular, to a writing method and a tape recording device (tape drive) when a small transaction is requested for tape writing. Background technique [0002] A typical example of the tape drive is an LTO (Linear Tape_Open: Linear Tape Open) tape drive and / or IBM's tape drive TS1130, or the like. Tape media used in tape drives are roughly 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 (Write command). Sent by variable length...
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