Storage control apparatus and storage control method

A non-transitory computer-readable storage medium storing a computer program that causes a computer to perform a procedure for performing storage control that controls access to a predetermined area in a storage device, the procedure comprising:

• obtaining, from a storage unit, management information for managing whether data is written in a first storage area, the first storage area being continuous from a start address of a logical volume;
• when writing write target data and a check code corresponding to the write target data to a second storage area in units of predetermined areas, the second storage area being continuous and including an address next to an end address of the first storage area specified based on the management information, updating the management information such that the first storage area includes the second storage area by changing the end address of the first storage area to an end address of the second storage area;
• when reading read target data from inside the first storage area specified based on the management information, reading a check code corresponding to the read target data, together with the read target data;
• and
• when reading read target data from outside the first storage area specified based on the management information, determining on a per predetermined area basis whether data is written, reading a check code corresponding to the read target data, together with the read target data, from a storage area where data is written, and setting a predetermined value in a check code corresponding to a storage area where no data is written.

A storage control method that controls access to a predetermined storage area in a storage device, the storage control method comprising:

• obtaining, by a processor, from a storage unit, management information for managing whether data is written in a first storage area, the first storage area being continuous from a start address of a logical volume;
• when writing write target data and a check code corresponding to the write target data to a second storage area in units of predetermined areas, the second storage area being continuous and including an address next to an end address of the first storage area specified based on the management information, updating, by the processor, the management information such that the first storage area includes the second storage area by changing the end address of the first storage area to an end address of the second storage area;
• when reading read target data from inside the first storage area specified based on the management information, reading, by the processor, a check code corresponding to the read target data, together with the read target data;
• and
• when reading read target data from outside the first storage area specified based on the management information, determining, by the processor, on a per predetermined area basis whether data is written, reading a check code corresponding to the read target data, together with the read target data, from a storage area where data is written, and setting a predetermined value in a check code corresponding to a storage area where no data is written.