What is the pre-copy technology of hard disks?

When a storage system detects that a member disk in a RAID group is to fail, the system copies the data on the member disk to a hot spare disk in advance. In this way, the risk of data loss is reduced. This technology is called pre-copy.

The SMART detects a potential disk failure and sends an alarm, and then the pre-copy technology backs up the data on the hard disk onto a hot spare disk in advance. Through this fast backup method, the reconstruction time required after the failure of a hard disk is shortened or even eliminated, and the failure rate of hard disks during reconstruction is also reduced; therefore, the reliability of the storage system is dramatically improved.

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