Method, electronic device, and computer program product for data rebuilding

An electronic device, comprising:

• a processor;
• and
• a memory coupled to the processor, wherein the memory has instructions stored therein, and the instructions, when executed by the processor, cause the electronic device to perform actions comprising:
• determining, in response to a failure of a disk where a redundant array of independent disks (RAID) extent of a RAID in a storage system is located, a first disk set based on a predetermined range and the failed disk, wherein the first disk set comprises a plurality of disks within the predetermined range that are associated with the RAID extent;
• determining a second disk set for rebuilding data located on the failed disk based on other disks in the first disk set than the plurality of disks that are associated with the RAID extent;
• determining a plurality of scores for a plurality of disks in the second disk set based on a plurality of disk correlations, a plurality of RAID extent spans, and a plurality of weights of the plurality of disks in the second disk set;
• determining a target disk among the plurality of disks in the second disk set based on the plurality of scores;
• and
• rebuilding the data located on the failed disk on the target disk.

A computer program product that is tangibly stored on a non-transitory computer-readable medium and comprises computer-executable instructions, wherein the computer-executable instructions, when executed by a device, cause the device to perform a method, the method comprising:

• determining, in response to a failure of a disk where a redundant array of independent disks (RAID) extent of a RAID in a storage system is located, a first disk set based on a predetermined range and the failed disk, wherein the first disk set comprises a plurality of disks within the predetermined range that are associated with the RAID extent;
• determining a second disk set for rebuilding data located on the failed disk based on other disks in the first disk set than the plurality of disks that are associated with the RAID extent;
• determining a plurality of scores for a plurality of disks in the second disk set based on a plurality of disk correlations, a plurality of RAID extent spans, and a plurality of weights of the plurality of disks in the second disk set;
• determining a target disk among the plurality of disks in the second disk set based on the plurality of scores;
• and
• rebuilding the data located on the failed disk on the target disk.