Method, electronic device and computer program product for rebuilding disk array

An electronic device, comprising:

• a processor;
• and
• a memory having computer program instructions stored thereon which, when executed by the processor, cause the electronic device to perform acts comprising:
• in response to receiving a message for rebuilding disk arrays in a storage system, determining a target disk that causes the rebuilding;
• determining from the disk arrays a set of disk arrays related to the target disk;
• generating a plurality of subsets of disk arrays from the set of disk arrays, each subset including a plurality of disk arrays that can be rebuilt in parallel;
• determining, based on a number of disks included in each of the plurality of subsets, a target subset from the plurality of subsets;
• and
• rebuilding a plurality of disk arrays in the target subset in parallel,
• wherein generating the plurality of subsets from the set of disk arrays comprises:
• obtaining a number of cores of computing resources of the storage system;
• determining a number of disk arrays in each subset based on the number of the cores;
• and
• generating the plurality of subsets from the set of disk arrays, the number of disk arrays included in each subset being equal to the determined number.

A computer program product having a non-transitory computer readable medium which stores a set of instructions to rebuild disk arrays;

• the set of instructions, when carried out by computerized circuitry, causing the computerized circuitry to perform a method of:
• in response to receiving a message for rebuilding disk arrays in a storage system, determining a target disk that causes the rebuilding;
• determining from the disk arrays a set of disk arrays related to the target disk;
• generating a plurality of subsets of disk arrays from the set of disk arrays, each subset including a plurality of disk arrays that can be rebuilt in parallel;
• determining, based on a number of disks included in each of the plurality of subsets, a target subset from the plurality of subsets;
• and
• rebuilding a plurality of disk arrays in the target subset in parallel, wherein determining the target subset comprises:
• determining, based on the number of disks included in each of the plurality of subsets, an indication factor of each subset in the plurality of subsets, the indication factor indicating a ratio of a total number of associated disk arrays of each subset to a number of disks related to each subset;
• and
• determining the target subset from the plurality of subsets based on the indication factor.