What is a disk array?

The full name of RAID is Redundant Array of Independent Drives, which means disk array and "Redundant Array of Independent Disks".

Definition of Disk Array:

Disk array is composed of many cheaper disks, which are combined into a huge disk group. The addition effect generated by providing data by a single disk is used to improve the efficiency of the whole disk system. Using this technology, data is divided into many parts and stored on each hard disk.

The principle of expanding data disk array;

As an independent system, the disk array is directly connected to the outside of the host or connected to the host through the network. A disk array has multiple ports that can be connected by different hosts or different ports. Hosts connected to different ports of the array can improve the transmission speed.

At that time, just like the integrated cache in a single disk on a PC, there was a certain amount of buffer memory in the disk array to speed up the interaction with the host. The host interacts with the cache of the disk array, and the cache interacts with a specific disk.

References:

Baidu Encyclopedia Entry-Disk Array