Disk NCQ technology


Native command queuing (NCQ) is an extension of the SATA II protocol allowing disks to internally optimize the order in which read and write commands are executed. Disks that support NCQ can put a maximum of 32 commands in a queue, adjust the command execution order, and enable immediate command execution. As a result, disk performance is improved and CPU usage is reduced.

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.

Intelligent disk power-on technology
Intelligent disk power-on technology enables the disks in storage systems to be batch powered on. This reduces requirements for power supplies and ensures the security and stability of storage systems. This is in contrast to powering all of the disks within a storage system simultaneously, which notably affects the power supply due to the high inrush current.

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.

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 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.

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