US 2017/0249100 A1Published application

Dynamic partitioning for tape medium

AssigneeInternational Business Machines Corporation

InventorsKousei Kawamura, Koichi Masuda, Sosuke Matsui, Yutaka Oishi, Takahiro Tsuda

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Abstract

The present invention provides a method of partitioning a tape medium dynamically by using a new method of writing data. It enables users to change size of the partitions later and to use all capacity of a tape efficiently. When a tape is divided into partitions, data is written in such a manner that the wraps are written in the partitions of the data band alternately in the forward direction and in the backward direction on the data band from the different sides of the data band toward the inside of the data band (W1, W2, W3 . . . ) and the location (C) at which the wrap (Wm) of the one partition collides with the wrap (Wn) of the other partition is defined as the demarcation (PB) of these partitions (P0,P1).

Claims17

Dependent claims

A method for determining a boundary of adjacent partitions, when dividing storage areas on a tape into at least two or more partitions, the tape having one or more data bands, each data band having at least one wrap, comprising the steps of:

writing data on the at least one wrap in one of the data bands, the data being written in order toward a bottom of the at least one wrap from a top of the at least one wrap in a width direction of the tape while reciprocating a beginning of the tape to an end of the tape in a longitudinal direction of the tape,
writing data on the at least one wrap in one of the data bands, the data being written in order toward the top of the at least one wrap from the bottom of the at least one wrap in the width direction of the tape while reciprocating the beginning of the tape to the end of the tape in the longitudinal direction of the tape, and
in a warp or a boundary of the at least one wrap, where the data being written in order toward a bottom of the at least one wrap from a top of the at least one wrap and the data being written in order toward the top of the at least one wrap from the bottom of the at least one wrap collide, setting a collision position, or a position at a predetermined distance from the collision position in the wrap and the boundary of the at least one wrap to the boundary of the adjacent partitions.

A storage system for managing files using a file system comprising:

a host;
and
at least one tape drive which is able to communicate with the host and write data on a tape to be loaded,
the tape having one or more data bands, each data band having at least one wrap under the control of the file system to be executed by the host, the tap drive performing the steps of:
writing data on the at least one wrap in one of the data bands, the data being written in order toward a bottom of the at least one wrap from a top of the at least one wrap in a width direction of the tape while reciprocating a beginning of the tape to an end of the tape in a longitudinal direction of the tape,
writing data on the at least one wrap in one of the data bands, the data being written in order toward the top of the at least one wrap from the bottom of the at least one wrap in the width direction of the tape while reciprocating the beginning of the tape to the end of the tape in the longitudinal direction of the tape, and
in a warp or a boundary of the at least one wrap, where the data being written in order toward a bottom of the at least one wrap from a top of the at least one wrap and the data being written in order toward the top of the at least one wrap from the bottom of the at least one wrap collide, writing data by a collision position or a position at a predetermined distance from the collision position in the wrap, or writing data by the boundary of the at least one wrap.

4 more elements

A computer program product for writing data on a tape loaded in a tape drive, the tape having one or more data bands, each data band having at least one wrap, the computer program product comprising a computer readable storage medium having program instructions embodied therewith, the program instructions executable by a computer to cause the tape drive to perform a method comprising the steps of:

writing data on the at least one wrap in one of the data bands, the data being written in order toward a bottom of the at least one wrap from a top of the at least one wrap in a width direction of the tape while reciprocating a beginning of the tape to an end of the tape in a longitudinal direction of the tape,
writing data on the at least one wrap in one of the data bands, the data being written in order toward the top of the at least one wrap from the bottom of the at least one wrap in the width direction of the tape while reciprocating the beginning of the tape to the end of the tape in the longitudinal direction of the tape, and
in a warp or a boundary of the at least one wrap, where the data being written in order toward a bottom of the at least one wrap from a top of the at least one wrap and the data being written in order toward the top of the at least one wrap from the bottom of the at least one wrap collide, writing data by a collision position or a position at a predetermined distance from the collision position in the wrap, or writing data by the boundary of the at least one wrap.

Dependencies are inferred from the claim text.