Data Reserving Method for a Redundant Array of Independent Disks and Related Data Reserving Device and System

A data reserving device for a redundant array of independent disks (RAID) comprising:

• a non-volatile storage device;
• a detection unit, for detecting an alternating-current (AC) power inputted to a power supply device used for transforming the AC power into an direct-current (DC) power for the RAID;
• and
• a control unit, for storing data of a memory module of the RAID into a non-volatile storage device when the AC power is not inputted to the power supply device.

A redundant array of independent disks (RAID) comprising:

• a plurality of disks;
• a memory module;
• a power supply device, coupled to an alternating-current (AC) power, for transforming the AC power into an direct-current (DC) power;
• a disk control unit, coupled to the plurality of disks, the memory module and the power supply device, for receiving the DC power to drive the plurality of disks, and storing configuration information and temporary data of the plurality of disks into the memory module;
• and
• a data reserving device comprising:
• a non-volatile storage device;
• a detection unit, for detecting the AC power;
• and
• a control unit, for storing data of the memory module into the non-volatile storage device when the AC power is not inputted to the power supply device.