Data migration method, system and device for storage server, and non-transitory readable storage medium

A data migration device of a storage server, comprising:

• a memory, configured to store a computer program;
• and
• a processor, configured to execute the computer program to:
• determine storage information of a storage server, wherein, the storage information is storage information of the storage server before inserting m disks;
• determine, according to the storage information, the number n of strips to be migrated, wherein, the strips to be migrated are used to migrate to the m disks which are inserted into the storage server;
• select n strips from among c strips according to a preset migration rule to serve as the strips to be migrated, and select, from the n strips to be migrated, data blocks to be migrated and migrate the data blocks to the disks which are newly inserted, so that after migration of the data blocks is completed, difference in strip usage between any two disks of the m disks in the storage server does not exceed 1;
• and
• determine data content of check data blocks of the strips so as to complete data migration of the storage server, and for c-n strips among the c strips that are not selected as the strips to be migrated, determine data content of check data blocks of the c-n strips by means of incremental update of an erasure code,
• wherein n<c, m, n and c are all positive integers, and c represents the number of full strips in use by of the storage server before the m disks are newly inserted into the storage server.

A non-transitory readable storage medium, wherein the non-transitory readable storage medium stores a computer program which, when being executed by a processor, cause the processor is enabled to:

• determine storage information of a storage server, wherein, the storage information is storage information of the storage server before inserting m disks;
• determine, according to the storage information, the number n of strips to be migrated, wherein, the strips to be migrated are used to migrate to the m disks which are inserted into the storage server;
• select n strips from among c strips according to a preset migration rule to serve as the strips to be migrated, and select, from the n strips to be migrated, data blocks to be migrated and migrate the data blocks to the disks which are newly inserted, so that after migration of the data blocks is completed, difference in strip usage between any two disks of the m disks in the storage server does not exceed 1;
• and
• determine data content of check data blocks of the strips so as to complete data migration of the storage server, and for c-n strips among the c strips that are not selected as the strips to be migrated, determine data content of check data blocks of the c-n strips by means of incremental update of an erasure code,
• wherein n<c, m, n and c are all positive integers, and c represents the number of full strips in use by of the storage server before the m disks are newly inserted into the storage server.