Method and device for rebuilding data in storage array group

An electronic device, comprising:

• a processor;
• and
• a memory coupled to the processor, the memory having instructions stored therein, the instructions, when executed by the processor, causing the electronic device to perform acts comprising:
• in response to determining that a first storage device of a plurality of storage devices comprised in the storage array group is in a non-working state, generating a write record of the storage device, the write record being generated by setting a corresponding portion of the write record in response to a write operation occurring for a corresponding storage area of a plurality of storage areas in the first storage device during the non-working state, each storage area containing a respective plurality of chunks and corresponding chunk metadata for chunks of the storage area, the chunk metadata including a need_rebuild record used to identify chunks of the storage area needing to be rebuilt;
• and
• in response to determining that the first storage device returns from the non-working state to a working state, (1) determining, based on the corresponding portion of the write record being set, that a target storage area in need of execution of data rebuilding is present in the first storage device, (2) marking the need_rebuild record for the target storage area to indicate that the chunks of the target storage area need to be rebuilt, (3) setting a rebuilding checkpoint field to a starting chunk address of a chunk range of the target storage area, and (4) initiating, based on the determining and the rebuilding checkpoint field, a data rebuilding of the target storage area, the data rebuilding being executed chunk-by-chunk according to the need-rebuild record for the target storage area.

A computer program product having a non-transitory computer readable medium which stores a set of instructions to rebuild data in a storage array group;

• the set of instructions, when carried out by computerized circuitry, causing the computerized circuitry to perform a method of:
• in response to determining that a first storage device of a plurality of storage devices comprised in the storage array group is in a non-working state, generating a write record of the storage device, the write record being generated by setting a corresponding portion of the write record in response to a write operation occurring for a corresponding storage area of a plurality of storage areas in the first storage device during the non-working state each storage area containing a respective plurality of chunks and corresponding chunk metadata for chunks of the storage area, the chunk metadata including a need_rebuild record used to identify chunks of the storage area needing to be rebuilt;
• and
• in response to determining that the first storage device returns from the non-working state to a working state, (1) determining, based on the corresponding portion of the write record being set, that a target storage area in need of execution of data rebuilding is present in the first storage device, (2) marking the need_rebuild record for the target storage area to indicate that the chunks of the target storage area need to be rebuilt, (3) setting a rebuilding checkpoint field to a starting chunk address of a chunk range of the target storage area, and (4) initiating, based on the determining and the rebuilding checkpoint field, a data rebuilding of the target storage area, the data rebuilding being executed chunk-by-chunk according to the need-rebuild record for the target storage area.