Storage system for holding a remaining available lifetime of a logical storage region

A method for managing a plurality of physical disks in a storage system having a control unit coupled to the plurality of physical disks, comprising:

• holding, by the control unit, a first preset lifetime of each of a plurality of first type physical disks in the plurality of physical disks, the first present lifetime being a first level time;
• holding, by the control unit, a second preset lifetime of each of a plurality of second type physical disks in the plurality of physical disks, the second preset lifetime being a second level time different from the first level time;
• holding, by the control unit, an accumulated active time of each of the plurality of physical disks;
• and
• forming, by the control unit at least one first type RAID group in the plurality of first type physical disks and at least one second type RAID group in the plurality of second type physical disks,
• wherein the control unit forms at least one first type logical storage region in the plurality of first type physical disks and at least one second type logical storage region in the plurality of second type physical disks, and wherein the control unit holds a remaining available time of each logical storage region based on the preset lifetime and the accumulated active time of each physical disk configuring the logical storage region.