Data migration management based on data location

A computer program product comprising:

• one or more computer readable storage media and program instructions stored on the one or more computer readable storage media, the program instructions comprising instructions to:
• obtain positional information corresponding to end of data (EOD) on a tape and a data extent stored in the tape, wherein the positional information includes longitudinal position (LPOS), latitudinal position (wrap), and number of data blocks;
• compare a block number of at least one of a currently read or located data with the positional information of the data extent to identify a current position of a tape head;
• identify a positional relationship between a location of data to be read, the positional information of the EOD on the tape, and the current position of the tape head;
• identify a directional relationship between a current direction of the tape head locating to data to be read and a pending write direction;
• and
• determine an appendable range for data after the EOD on the tape based, at least in part, on the identified positional relationship and the identified directional relationship.

A computer system comprising:

• one or more computer processors;
• one or more computer-readable storage media;
• and
• program instructions stored on the computer-readable storage media for execution by at least one of the one or more processors, the program instructions comprising instructions to:
• obtain positional information corresponding to end of data (EOD) on a tape and a data extent stored in the tape, wherein the positional information includes longitudinal position (LPOS), latitudinal position (wrap), and number of data blocks;
• compare a block number of at least one of a currently read or located data with the positional information of the data extent to identify a current position of a tape head;
• identify a positional relationship between a location of data to be read, the positional information of the EOD on the tape, and the current position of the tape head;
• identify a directional relationship between a current direction of the tape head locating to data to be read and a pending write direction;
• and
• determine an appendable range for data after the EOD on the tape based, at least in part, on the identified positional relationship and the identified directional relationship.