Reading order search method and program for recording

摘要

The present invention provides a search method used to search for the reading order of a plurality of recording groups when the plurality of recording groups written on tape are continuously read by a tape drive which manages data on tape in recording units having a fixed data length for each recording. This search method includes the steps of: receiving information on a plurality of tape groups to be read; and sorting the plurality of recording groups to be read so the reading time is shortened. In the sorting step, the time required to sort the plurality of reading groups is reduced by combining two or more recording groups into a single object to be sorted in the sorting step when at least two or more contiguous recording groups have been assigned to the same region or are assigned across adjacent regions among the plurality of regions.

主权项

1. A method for searching a reading order of a plurality of recording groups when the plurality of recording groups written on a tape are continuously read by a tape drive which manages data on the tape in recording units having a fixed data length for each recording, the method comprising the steps of:
receiving information on a plurality of recording groups to be read, each of the plurality of recording groups having at least one recording, a recording number at a beginning and a recording number at an end of each recording group being managed by the tape drive, a predetermined number of regions being established in a longitudinal direction of each wrap of the tape, the predetermined number of regions making up a plurality of regions, and at least one recording group being assigned to each of the predetermined number of regions; and sorting the plurality of recording groups to be read so a reading time thereof is shortened;
wherein a time required to sort the plurality of recording groups is reduced by combining two or more recording groups into a single object to be sorted in the sorting step when at least two or more contiguous recording groups have been assigned to the same region or across adjacent regions among the plurality of regions;the step of sorting the plurality of recording groups further comprises the steps of:
assigning consecutive numbers to each of the plurality of recording groups in ascending order from a beginning of each recording group and sorting the recording groups, andcontinuously searching for a next recording group to be read after one recording group has been read, andthe searching step includes selecting the next recording group so that a travel time of a reading head to a start position of the next recording group inside a region of the plurality of regions assigned to the next recording group is minimized.