Storage control apparatus, storage control system, and storage control method for failure detection and configuration of cascaded storage cabinets

A storage control system comprising:

• a plurality of cabinets coupled in a cascade, each cabinet of the plurality of cabinets including a plurality of storages;
• and
• a storage control apparatus that
• detects a failure in a respective storage of the plurality of storages included in a first cabinet of the plurality of cabinets,
• moves data in at least one of the plurality of storages included in the first cabinet, and including the respective storage in which the failure was detected, to at least one storage of the plurality of storages included in a second cabinet of the plurality of cabinets
• rebuilds, when the plurality of storages included in the first cabinet do not include a spare storage, data included in the respective storage in which the failure was detected using parity data included in any one of the plurality of storages included in the first cabinet other than the respective storage in which the failure was detected, into corresponding storage of the plurality of storages included in the second cabinet,
• controls, in accordance with the moving and the rebuilding, a first connection between the first cabinet and the plurality of cabinets other than the first cabinet, and a second connection between the plurality of storages included in the first cabinet and the plurality of cabinets other than the first cabinet,
• checks, after the data is moved, whether data in at least one of the plurality of storages included in the first cabinet matches data in at least one of the plurality of storages included in the second cabinet, and
• when the check indicates that the data does not match, performs mirroring of data between at least one of the plurality of storages included in the first cabinet and at least one of the plurality of storages included in the second cabinet.

A storage control method for use with a plurality of cabinets coupled in a cascade, each cabinet of the plurality of cabinets including a plurality of storages, the method comprising:

• detecting, by a processor, a failure in a respective storage of the plurality of storages included in a first cabinet of the plurality of cabinets;
• moving data in at least one of the plurality of storages included in the first cabinet, and including the respective storage in which the failure was detected, to at least one of the plurality of storages included in a second cabinet of the plurality of cabinets;
• rebuilding, when the plurality of storages included in the first cabinet do not include a spare storage, data included in the respective storage in which the failure was detected using parity data included in any one of the plurality of storages included in the first cabinet other than the respective storage in which the failure was detected, into corresponding storage of the plurality of storages included in the second cabinet;
• controlling, in accordance with the moving and the rebuilding, a first connection between the first cabinet and the plurality of cabinets other than the first cabinet, and a second connection between the storages included and the first cabinet and the plurality of cabinets other than the first cabinet;
• checking, after the moving, whether data in at least one of the plurality of storages included in the first cabinet matches data in at least one of the plurality of storages included in the second cabinet;
• and
• when the checking indicates that the data does not match, performing mirroring of data between at least one of the plurality of storages included in the first cabinet and at least one of the plurality of storages included in the second cabinet.