What are the main applications of RAID technology?

There are 7 types in total, among which RAID 0, RAID 1, RAID 5 and RAID 6 are more commonly used for buried fighting.

1. RAID 0: If you have n disks, you can only write one disk at the same time, and then write the next one when it is full, after doing RAID 0, N blocks can be written at the same time, and the speed is improved very quickly, but because there is no backup, the reliability is very poor. n minimum is 2.

2. RAID 1: Because RAID 0 is too unreliable, RAID 1 is derived. If you have n disks, use n 2 disks as mirror disks, and write data to one disk as well as the other at the same time.

If one of the disks is broken, the mirrored disk is automatically topped up, which has the best reliability, but the space utilization is too low. n minimum is 2.

3. RAID 3: In order to explain RAID 5, RAID 3 is if you have n disks, one of which is used as a check disk, and the remaining N-1 disk is equivalent to reading and writing at the same time as Sun Air RAID 0, when one of the disks is broken, the original data of the broken disk can be restored through the check code.

4. RAID 5: On the basis of RAID 3, there is a difference, which is also equivalent to the size of 1 disk as the check disk, and the size of the N-1 disk as the data disk, but the check code is distributed in each disk, not a single disk, that is, the distributed check rule blind check disk, which has many benefits.

5. RAID 6: On the basis of RAID 5, a check code is added, which is like solving an equation, a check code and an equation, with a maximum of two unknowns, that is, a maximum of two bad disks.

RAID spec brother guess.

It mainly contains several specifications such as RAID 0 RAID 7, and their emphases are different, and the common specifications are as follows:

RAID 0: Error-free controlled bands.

To achieve RAID0 it is necessary to have more than two hard drives, RAID0 implements bands, and the data is not stored on one hard disk in the form of envy, but is stored on different drives in blocks of data. Because the data is distributed across different drives, the data throughput rate is greatly improved, and the load on the drives is more balanced.

If you just need the data to be efficient on different drives. It does not need to calculate the checksum and is easy to implement. The disadvantage is that it does not have data error control, and if the data in one drive is wrong, even if the data on the other disks is correct, it will not help.

It should not be used in applications where data stability is required.

If the user is using images (including animations) and other occasions that require large transmissions, it is more appropriate to use raid0. At the same time, RAID can increase the data transfer rate, for example, the files that need to be read are distributed across two hard disks, which can be read at the same time. Then the original time to read the same file is shortened to 1 2.

Of all the levels, RAID 0 is the fastest.

But RAID 0 has no redundancy, and if one disk is (physically) damaged, all data is unusable.

RAID 1: Mirror structure.

RAID1For devices using this RAID1 structure, the RAID controller must be able to read two disks and write to two mirror disks at the same time. You can also see from the structure diagram below that there must be two drives. Because it is a mirror structure, when there is a problem with a group of disks, the mirror image can be used to improve the fault tolerance of the system.

It is relatively easy to design and implement. Only one piece of data can be read out of a disk at a time, which means that the data block transfer rate is the same as the read rate of a separate disk. Because the verification of RAID 1 is very complete, it has a great impact on the processing power of the system, and the usual RAID function is implemented by software, and this implementation method will greatly affect the server efficiency when the server load is relatively heavy.

When you need to have a very high level of reliability, such as statistics, then RAID 1 is more suitable. In addition, RAID1 supports "hot replacement", that is, the faulty disk can be replaced without power failure, and the data can be restored from the image disk after the replacement is completed. When the primary hard drive is damaged, the mirrored hard drive can work in place of the main hard drive.

The mirrored hard disk is equivalent to a backup disk, and as you can imagine, the security of this hard virtual disk mode is very high, and the data security of RAID 1 is the best among all RAID levels. However, the disk utilization rate is only 50%, which is the lowest of all RAID levels.

RAID technology has two major characteristics: one is speed, the other is security, due to these two advantages, RAID technology was used in the SCSI interface of the advanced server in the early days of the hard disk system, with the development of computer technology in recent years, the speed of the CPU of the PC has entered the GHZ era. IDE interface hard drives are not far behind, and ATA66 and ATA100 hard disks have been launched one after another.

This makes it possible for RAID technology to be used in low-to-mid-range and even personal PCs. RAID is usually made possible by a RAID controller in a hard disk array tower or a RAID card in a computer.

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