What is a disk array, what are the commonly used ones, and what are the advantages and disadvantages

1. The disk array is composed of many low-cost disks to form a disk group with a huge capacity, and the addition effect generated by the data provided by individual disks is used to improve the performance of the entire disk system.

2. The function is to store the same data in different places on multiple hard disks. By placing data on multiple drives, I/O operations can overlap in a balanced manner to improve performance. Because multiple drives increase mean time between failures (MTBF), storing redundant data also increases fault tolerance.

Redundant arrays of independent drives (RAID) means "redundant arrays composed of independent disks". A disk array is composed of many independent disks that are combined into a disk group with a huge capacity, and the additional effect generated by the data provided by individual disks improves the performance of the entire disk system. Using this technology, the data is sliced into many segments and stored on separate hard drives.

Disk arrays can also use the concept of parity check, which can still read data in the event of a failure of any hard disk in the array, and when the data is reconstructed, the data will be calculated and re-placed into a new hard drive.

HA emphasizes high availability and scalability. Array dual-machine puts more emphasis on security. The word "high availability" should be emphasized here, and high availability does not mean that your application will not be interrupted!

Of course, the application may only be a temporary pause. This is not the case with dual machines, and at the same time, dual machines also have special requirements for the application itself, and its application range is much narrower than HA, and its high ** is not something that ordinary users can afford. On the other hand, the use of dual arrays for fault tolerance or even disaster recovery is very efficient due to the proprietary protocol used internally.

Of course, there is also a question of planning here. For example, is the data synchronous or asynchronous?

This needs to be done according to your own application.

This article should be useful to you.

Complex not to mention a disk array, a computer's storage system consists of multiple hard disks, the advantage is that the data can be processed much faster.

Disks can be connected together, they can be made high-speed, they can be made into backups, they can be made into both.