Controller, computer-readable recording medium, and apparatus

A computer-readable recording medium having stored therein a program for causing a client apparatus to execute a digital signature process comprising:

• recording migration data from a source to a destination assigned to a plurality of storages based on information for indicating a position of a recording area which is between areas in which data is recorded in units of blocks;
• receiving a request to release at least one of the plurality of storages during data migration and migrating recorded data recorded in the at least one of the plurality of storages to other recording area formed in other storages of the plurality of storages;
• and
• releasing the at least one of the plurality of storages after migrating the recorded data.

An apparatus comprising:

• at least one storage assigned to a source;
• a plurality of storages assigned to a destination;
• and
• a controller comprising a memory that stores a program, and a processor that executes, based on the program, a procedure;
• the procedure comprises:
• recording migration data from a source to a destination assigned to a plurality of storages based on information for indicating a position of a recording area which is between areas in which data is recorded in units of blocks;
• receiving a request to release at least one of the plurality of storages during data migration and migrating recorded data recorded in the at least one of the plurality of storages to other recording area formed in other storages of the plurality of storages;
• and
• releasing the at least one of the plurality of storages after migrating the recorded data.