Computer system, data management method, and recording medium for storing program

A data management method of a computer system including a hierarchical storage in which hierarchical management of storage areas where data is stored is conducted depending upon a utilization situation of stored data, the data management method comprising:

• a step of causing a control unit in the computer system to acquire a utilization situation of an upper-hierarchy storage area in the hierarchical storage;
• a step of causing the control unit in the computer system to determine which of index processing of data that becomes an index update candidate in data stored in the hierarchical storage and migration processing of moving the data to a lower-hierarchy storage area in the hierarchical storage is given priority depending upon the use situation;
• and
• a step of causing the control unit in the computer system to execute index processing or migration processing of the data that becomes the index update candidate in response to the determination.

A computer-readable non-temporary recording medium storing a program to cause a computer including a hierarchical storage in which hierarchical management of storage areas where data is stored is conducted depending upon a life cycle of stored data to execute:

• a procedure for acquiring a use situation of an upper-hierarchy storage area in the hierarchical storage;
• a procedure for determining whether to execute index processing of data that is included in data stored in the hierarchical storage and that becomes an index update candidate depending upon the use situation;
• and
• a procedure for causing migration of a file of the index update candidate to a lower-hierarchy storage area in the hierarchical storage without conducting index processing of the file, in a case where index processing is not executed by the determination.