Repositioning operation on a tape medium based on dataset information

A computer-implemented method comprising:

• obtaining dataset information of a dataset on a tape medium in a sync operation, wherein the dataset information of all datasets written from a beginning of the tape medium to a current position is written in an index, wherein the dataset information includes positions of data in the dataset;
• sending the dataset information of the dataset to a host;
• in response to starting a repositioning operation, receiving, from the host, the dataset information of the dataset;
• reading the dataset information of the dataset;
• and
• repositioning to a target on the tape medium, based on the dataset information of the dataset, wherein a tape drive refers to the dataset information and moves to a position immediately before the target.

A computer-implemented method comprising:

• obtaining dataset information of a dataset on a tape medium in a sync operation, wherein the dataset information of all datasets written from a beginning of the tape medium to a current position is written after an index, wherein the dataset information includes positions of data in the dataset;
• sending the dataset information of the dataset to a host;
• in response to starting a repositioning operation, receiving, from the host, the dataset information of the dataset;
• reading the dataset information of the dataset;
• and
• repositioning to a target on the tape medium, based on the dataset information of the dataset, wherein a tape drive refers to the dataset information and moves to a position immediately before the target.