What is the pre-copy technology of hard disks?

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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.

Other related questions:
Disk pre-copy technology
Disk pre-copy technology: The disk pre-copy technology enables the storage system to monitor the disk status. When a member disk in a RAID group is about to fail, data on the disk is pre-copied to a hot spare disk, reducing data loss risks. The disk status is determined by reading the attribute of the self-monitoring, analysis, and reporting technology (S.M.A.R.T.). When the disk is about to fail, the pre-copy technology enables data on the disk to be copied to and backed up on the hot spare disk. By backing up data quickly to shorten or avoid long-time reconstruction after the disk fails, the disk failure rate during reconstruction is reduced and the product security is improved.

What are the energy conservation technologies of hard disks in the storage system?
The main energy conservation technology of disks in the storage system is the disk spin-down technology. The storage system houses specific interfaces for application systems to intelligently control the spin-down process of hard disks. Through this technology, the hard disks without I/O requests consume little energy, and the power consumption of hard disks in the whole storage system is efficiently reduced.

Energy saving technologies of hard disks in the storage system
Energy saving technologies of hard disks in the storage system: FAQ-What are the energy saving technologies of hard disks in the storage system

What are the differences between a full LUN copy and an incremental LUN copy?
Both copy data from the source LUN to target LUNs. Their difference is: Full LUN copy: It copies all data from the source LUN to target LUNs each time. Incremental LUN copy: When it is started for the first time, it requires an initial synchronization during which all data is copied from the source LUN to target LUNs. For subsequent times, it copies only the changed data from the source LUN to target LUNs.

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