Disk array device, disk array control method, and recording medium

A disk array control method applied to a disk array device including a plurality of disk devices, the disk array control method comprising:

• generating a redundant code data denoting a redundant code able to recover an actual data sent from a higher-level device based on the actual data and operators, when at least part of the actual data is lost;
• writing the actual data by a predetermined device quantity of first disk devices in a first disk device group composed of disk devices as the first disk devices among the plurality of disk devices;
• and
• writing the redundant code data by second disk devices of the same quantity as the predetermined device quantity of the first disk devices, in a second disk device group composed of disk devices as the second disk devices other than the first disk devices among the plurality of disk devices,
• wherein the disk array control method is further configured to generate the redundant code data able to recover the actual data based on the data written into arbitrary disk devices of the device quantity among the plurality of disk devices, while the number of types of the operators used for generating the redundant code data is less than the device quantity by one or more.

A computer-readable medium storing a program for controlling disk array comprising instructions for causing a disk array device including a plurality of disk devices to carry out the processes of:

• generating a redundant code data denoting a redundant code able to recover an actual data sent from a higher-level device based on the actual data and operators, when at least part of the actual data is lost;
• writing the actual data by a predetermined device quantity of first disk devices in a first disk device group composed of disk devices as the first disk devices among the plurality of disk devices;
• and
• writing the redundant code data by second disk devices of the same quantity as the predetermined device quantity of the first disk devices, in a second disk device group composed of disk devices as the second disk devices other than the first disk devices among the plurality of disk devices,
• wherein the program for controlling disk array is configured to further cause the disk array device to carry out the process of generating the redundant code data able to recover the actual data based on the data written into arbitrary disk devices of the device quantity among the plurality of disk devices, while the number of types of the operators used for generating the redundant code data is less than the device quantity by one or more.