| 摘要 |
PROBLEM TO BE SOLVED: To efficiently use a storage.SOLUTION: A moving data block is selected, a data file including the moving data block is selected as a moving data file, and all the data blocks of the moving data file are added to the moving data block. For each of the individual moving data blocks, when all the data files including the moving data block are selected as the moving data files, the moving data block is selected as a deletion data block. When the total data amount of the deletion data block is equal to or larger than a prescribed target reduction data amount, and when the ratio of the total data amount of the moving data block to the total data amount of the deletion data block is equal to or lower than a prescribed value, the data file is moved from a moving origin node to a moving destination node. |
