Can anyone fully explain RAID to me

RAID is the abbreviation of "Redundant Array of Independent Disk", which means independent redundant disk array in Chinese. Redundant disk array technology was born in 1987 and was proposed by the University of California, Berkeley. To put it simply, it is to combine N hard disks into a virtual single large-capacity hard disk through a raid controller (divided into hardware and software).

The adoption of RAID brings huge benefits to the storage system (or the server's built-in storage), where the transfer rate increases.

Categories: Computer, Networking, >> Hardware.

Problem description: It's better to use plain language that you can understand, otherwise it will make me dizzy.

Analysis: RAID technology will be roughly the state bench cluster to work with multiple hard disks. It's generally more common on servers.

There are seven kinds of RAID, among which RAID0 and RAID1 are the most common, RAID0 works by writing multiple hard disks (if it is two) at the same time, that is, the data stream is divided into two strands, respectively, into two hard disks, which is equal to speeding up (the theoretical speed is equal to twice the read and write speed of a single 7200RPM hard disk), RAID0 is highly respected by some computer enthusiasts, but there is a fatal shortcoming: that is, as long as one of these two hard disks has a problem, will paralyze the system. The parameters of the two hard disks must be exactly the same, that is, they must be the same hard disk.

However, as long as we pay attention to timely backup in daily use, the loss is not big for our ordinary users.

RAID 1 is mostly used on servers, and take those two hard disks as an example, it works by treating one as a pure backup and the other as a normal application hard disk. When writing data, the data system on the ordinary hard disk is automatically backed up to that hard disk, so the advantage is: it improves the disaster recovery ability of the system, and when the main hard disk crashes, the backup hard disk can automatically act as the main hard disk.

Of course, its shortcomings are also obvious: that is, the performance is only equivalent to a single hard disk, and the capacity is only as large as the main hard disk, which is not used by our average users. Others such as RAID 3 and RAID 7 have their own features, but most regular servers don't support them at all, so they don't have much practical value.

In addition, it should be noted that the RAID function needs to be supported by the motherboard, and the motherboard after 05 years generally provides support for the RAID function, that is to say, you only need to buy two hard disks that are the same, and turn on the RAID function in the BIOS (additional software support in the Windows interface is required). If the motherboard doesn't support it, you can only buy a hardware card dedicated to RAID.

Actually, I only know so much, you can search in it, and you will understand.