Method and device for selecting raid level for mapped raid

An electronic device, comprising:

• a memory;
• and
• a processing unit coupled to the memory and configured to:
• determine, for a given Redundant Array of Independent Disks (RAID) level, a desired ratio of rebuilding speed between mapped RAID and non-mapped RAID based on the first number of disks in the non-mapped RAID and the second number of disks in the mapped RAID, the mapped RAID being configured to rebuild a failed disk using a plurality of disks;
• determine an actual ratio of rebuilding speed between the mapped RAID and the non-mapped RAID based on the second number of disks in the mapped RAID;
• and
• in response to the actual ratio being above the desired ratio, select the given RAID level for the mapped RAID.

A computer program product for selecting a Redundant Array of Independent Disks (RAID) level for mapped RAID, the mapped RAID being configured to rebuild a failed disk using a plurality of disks, the computer program product comprising:

• a non-transitory computer readable medium encoded with computer-executable code, the code configured to enable the execution of:
• determining, for a given RAID level, a desired ratio of rebuilding speed between the mapped RAID and non-mapped RAID based on the first number of disks in the non mapped RAID and the second number of disks in the mapped RAID;
• determining an actual ratio of rebuilding speed between the mapped RAID and the non-mapped RAID based on the second number of disks in the mapped RAID;
• and
• in response to the actual ratio being above the desired ratio, selecting the given RAID level for the mapped RAID