| 摘要 |
PROBLEM TO BE SOLVED: To continue writing data by erasing data and performing a degradation operation when data volume not less than a specified data capacity are maintained in a temporary storage means for temporarily maintaining data at the time of writing data in a storage medium. SOLUTION: When an array controller AC of a storage medium library array device LA receives write data to be written in a medium from a higher order control device, etc., it judges whether or not a total write data capacity remaining in an internal cache memory exceeds a specified capacity. When the total value exceeds the specified capacity and the controller receives a control instruction to perform a degradation operation from the higher order control device, etc., the controller erases all the write data remaining in the cache memory so as to write newly sent write data in the cache memory and continue writing write data by performing the degradation operation.
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