Storage management methods and systems

A storage management system, comprising:

• a storage unit configured to store one or more programs;
• and
• a processing unit coupled to the storage unit and configured to execute the one or more programs to cause the system to perform acts comprising:
• in response to receiving a write request, dividing data to be written into a plurality of data blocks with a predetermined size, the plurality of data blocks having their respective logic block addresses;
• evenly mapping, based on the logic block addresses, the plurality of data blocks to a plurality of Redundant Array of Independent Disks (RAID) extents of a RAID;
• and
• mapping the plurality of data blocks in the plurality of RAID extents to a disk such that the plurality of data blocks are distributed in order of size of the logic block addresses in the disk.

A computer program product for storage management, the computer program product comprising:

• a non-transitory computer readable medium encoded with computer-executable code, the code configured for the execution of:
• in response to receiving a write request, dividing data to be written into a plurality of data blocks with a predetermined size, the plurality of data blocks having respective logic block addresses;
• evenly mapping, based on the logic block addresses, the plurality of data blocks to a plurality of Redundant Array of Independent Disks (RAID) extents of a RAID;
• and
• mapping the plurality of data blocks in the plurality of RAID extents to a disk such that the plurality of data blocks are distributed in order of size of the logic block addresses in the disk.