Diagram of RAID super powerful water dispenser

 

The Redundant Arrays of Inexpensive Disks (RAID) has the meaning of "cheap and redundant disk arrays. The principle is to use arrays as disk groups, and use them in combination with the Design of Distributed Data arrangement to improve data security. A disk array is a combination of many Inexpensive Disks into a disk group with a large capacity. The addition effect produced by the data provided by individual disks improves the efficiency of the entire disk system. This technology is used to cut data into multiple segments and store them on each hard disk. The disk array can also use the same-bit check (parity
Check) concept, when any hard disk in the array fails, the data can still be read. During Data Reconstruction, the data is computed and re-placed into the new hard disk.

RAID 0: RAID 0 continuously splits data by bit or byte and reads/writes data on multiple disks in parallel. Therefore, RAID 0 has a high data transmission rate, but it does not have data redundancy, therefore, it cannot be regarded as a real raid structure. Raid
0 only improves performance, and does not guarantee data reliability. In addition, failure of one of the Disks will affect all data. Therefore, RAID 0 cannot be used in scenarios with high data security requirements.

Raid 1: Data redundancy is achieved through disk data images, which generate mutually backed up data on pairs of Independent Disks. When raw data is busy, data can be directly copied from the image, so RAID 1 can improve read performance. Raid 1 is the most costly disk array, but provides high data security and availability. When a disk fails, the system can automatically switch to the image disk to read and write data without restructuring the invalid data.

Raid 01/10: The combination is divided into RAID 10 and raid 01, which are the product of combining RAID 0 and RAID 1 standards, when data is continuously divided by bit or byte and multiple disks are read/written in parallel, the disk image is redundant for each disk. It has both raid
The exceptional speed of 0 and the high data reliability of RAID 1, but the CPU usage is also higher, and the disk utilization is relatively low. Raid 1 + 0 is the first mirror and then partition data, and then all the hard disks are divided into two groups, is considered as the lowest combination of RAID 0, then the two groups are considered as RAID 1 operation. RAID 0 + 1 is the opposite of RAID 1 + 0 programs. It is to partition and then mirror the data to two hard disks. It divides all hard disks into two groups and becomes the lowest combination of RAID 1. The two hard disks are regarded as RAID 0. In terms of performance, RAID 0 + 1 has a faster read/write speed than RAID 1 + 0. Reliability: when one hard disk in Raid 1 + 0 is damaged, the other three hard disks will continue to operate. Raid
0 + 1 as long as one hard disk is damaged, the other hard disk of the same RAID 0 group will also stop operating, only two hard disks are left operating, and the reliability is low. Therefore, raid 10 is far more commonly used than RAID 01. Most retail boards support RAID 0/1/5/10, but not raid 01.

RAID 3: It is very similar to raid 2. Data is distributed in blocks on different hard disks. The difference is that raid 3 uses simple parity and stores the parity information on a single disk. If a disk is invalid, data can be re-generated on the parity disk and other data disks. If the parity disk is invalid, data usage will not be affected. Raid
3. A large amount of continuous data can provide a good transmission rate, but for random data, the parity disk will become the bottleneck of write operations.

RAID 5: RAID 5 does not separately specify a parity disk, but cross-access data and parity information on all disks. On RAID 5, read/write pointers can be performed on the array devices at the same time, providing higher data traffic. RAID 5 is more suitable for small data blocks and random read/write data. Raid
3 compared with RAID 5, the main difference is that raid 3 requires all array disks for each data transmission. For RAID 5, most data transmission only applies to one disk, and can perform parallel operations. There is a "Write loss" in RAID 5, that is, each write operation will generate four actual read/write operations, two of which read the old data and parity information, write new data and parity information twice.

 

The Redundant Arrays of Inexpensive Disks (RAID) has the meaning of "cheap and redundant disk arrays. The principle is to use arrays as disk groups, and use them in combination with the Design of Distributed Data arrangement to improve data security. A disk array is a combination of many Inexpensive Disks into a disk group with a large capacity. The addition effect produced by the data provided by individual disks improves the efficiency of the entire disk system. This technology is used to cut data into multiple segments and store them on each hard disk. The disk array can also use the same-bit check (parity
Check) concept, when any hard disk in the array fails, the data can still be read. During Data Reconstruction, the data is computed and re-placed into the new hard disk.

RAID 0: RAID 0 continuously splits data by bit or byte and reads/writes data on multiple disks in parallel. Therefore, RAID 0 has a high data transmission rate, but it does not have data redundancy, therefore, it cannot be regarded as a real raid structure. Raid
0 only improves performance, and does not guarantee data reliability. In addition, failure of one of the Disks will affect all data. Therefore, RAID 0 cannot be used in scenarios with high data security requirements.

Raid 1: Data redundancy is achieved through disk data images, which generate mutually backed up data on pairs of Independent Disks. When raw data is busy, data can be directly copied from the image, so RAID 1 can improve read performance. Raid 1 is the most costly disk array, but provides high data security and availability. When a disk fails, the system can automatically switch to the image disk to read and write data without restructuring the invalid data.

Raid 01/10: The combination is divided into RAID 10 and raid 01, which are the product of combining RAID 0 and RAID 1 standards, when data is continuously divided by bit or byte and multiple disks are read/written in parallel, the disk image is redundant for each disk. It has both raid
The exceptional speed of 0 and the high data reliability of RAID 1, but the CPU usage is also higher, and the disk utilization is relatively low. Raid 1 + 0 is the first mirror and then partition data, and then all the hard disks are divided into two groups, is considered as the lowest combination of RAID 0, then the two groups are considered as RAID 1 operation. RAID 0 + 1 is the opposite of RAID 1 + 0 programs. It is to partition and then mirror the data to two hard disks. It divides all hard disks into two groups and becomes the lowest combination of RAID 1. The two hard disks are regarded as RAID 0. In terms of performance, RAID 0 + 1 has a faster read/write speed than RAID 1 + 0. Reliability: when one hard disk in Raid 1 + 0 is damaged, the other three hard disks will continue to operate. Raid
0 + 1 as long as one hard disk is damaged, the other hard disk of the same RAID 0 group will also stop operating, only two hard disks are left operating, and the reliability is low. Therefore, raid 10 is far more commonly used than RAID 01. Most retail boards support RAID 0/1/5/10, but not raid 01.

RAID 3: It is very similar to raid 2. Data is distributed in blocks on different hard disks. The difference is that raid 3 uses simple parity and stores the parity information on a single disk. If a disk is invalid, data can be re-generated on the parity disk and other data disks. If the parity disk is invalid, data usage will not be affected. Raid
3. A large amount of continuous data can provide a good transmission rate, but for random data, the parity disk will become the bottleneck of write operations.

RAID 5: RAID 5 does not separately specify a parity disk, but cross-access data and parity information on all disks. On RAID 5, read/write pointers can be performed on the array devices at the same time, providing higher data traffic. RAID 5 is more suitable for small data blocks and random read/write data. Raid
3 compared with RAID 5, the main difference is that raid 3 requires all array disks for each data transmission. For RAID 5, most data transmission only applies to one disk, and can perform parallel operations. There is a "Write loss" in RAID 5, that is, each write operation will generate four actual read/write operations, two of which read the old data and parity information, write new data and parity information twice.