17Jul
Redundant Array of Independent Disks RAID Controller Levels And Types RAID 0-53
Posted in Format Hard Drive by manyuRedundant array of independent disks is RAID. RAID controller levels and types are RAID 0, RAID 1, RAID 2, RAID 3, RAID 4, RAID 4, RAID 5, RAID 6, it’s actually divided into Software Raid and Hardware Raid . Soft array through the software program provided by the computer’s CPU capacity to run. As the software program is not a complete system, it can only provide the most basic fault capabilitis and other settings such as hot spare drives, remote management capabilities. Hard Array is operated by an independent disk array hardware to provide the control and computing functions. Do not rely on the system CPU resources.
As the hard-array is a complete system, all the required functions can be done inside. So hard array features and performance offered by the soft array. Also, if you want to do disk array systems, the hard array is the only option.
As a high-performance storage systems, has already started gaining more widely used. But the most commonly used is 0,1,3,5 four levels.
Redundant Array of Independent Disks RAID Controller Levels And Types RAID 0: To achieve RAID 0 must have two or more hard drives, data is not stored in a hard disk, but is divided into blocks of data stored in different drives. At all levels, RAID 0 is the fastest. However, there is no redundancy, if a disk (physical) damage, all of the data are not available. How do I setup and partition RAID 0 array
RAID Controller Levels And Types RAID 1: it must be able to read two disk and write to the two mirror disks at the same time. Must have two drives, the speed did not increase, but allows a single disk error, the highest reliability. When the primary hard drive (physical) damage, the mirror instead of the primary hard drive is working. Because of the mirror disk backup data, so the data security level of RAID 1 in all RAID is the best. But the disk utilization is only 50% of all RAID disk, the lowest level.
RAID Controller Levels And Types RAID 2: Hamming code with a checksum. Conceptually, RAID 2 RAID 3 with similar compartmentalization of both the distribution of data on different hard disk, slice in bits or bytes. RAID 2, however, use some coding techniques to provide error checking and recovery. This encoding requires more disk storage inspection and recovery information, making the RAID 2 technical implementation of more complex. Therefore, rarely used in a commercial environment.
RAID Controller Levels And Types RAID 3: principles of data storage is different with RAID 0 and RAID 1 . RAID 3 is a hard disk to store data parity bits, data is stored in the rest of the hard drive section. It is the same as RAID 0 in parallel ways to store numbers, but the speed is not fast than RAID 0. If the data(Physics) is damaged, simply need to replace the bad hard drive.
Redundant Array of Independent Disks RAID disk control system will check the data according to parity bit in the new plate reconstruction data on bad disk. However, if the disk (physical) damage, then all the data are not available.
RAID Controller Levels And Types RAID 4: parity check codes with the structure of independent disks.
RAID4 and RAID3 is much similar, the difference is its access to data is based on data blocks, that is conducted according to the disk each time a plate. It can be see in the chart, RAID3 is a one bar, while a vertical bar RAID4 time. but in the failure to resume, it’s much difficult than RAID3, and controller design is large, and the efficiency to access data is not very good.
RAID Controller Levels And Types RAID 5: write to the disk array data, parity data stored in each disk array, allowing a single disk errors. RAID 5 is also based on the data parity bit to ensure data security, but it is not a separate hard drive to store data parity bit, but the data section of the parity bit stored in each disk interaction. In this way, any damage to a hard disk, can check under the other places on the hard disk to reconstruct damaged data. Hard disk utilization for the n-1.
RAID Controller Levels And Types RAID 6 is a very attractive technology, which allows an array of two simultaneous disk failures without losing data. Disk reliability is already very high, especially in high-end Fibre Channel disk, then the necessary failure of two disks at the same time the situation fortified it? The answer is yes, the current disk capacity has been great, if one disk fails, the entire RAID group of disks are needed for data reconstruction, the bigger the disk capacity required longer time in the data reconstruction If a disk failure occurs again, then all data will be lost. So RAID 6 technology will improve the reliability of more than 1,000 times.
Advantages of Using Software RAID Over Hardware RAID
Large data blocks in the use case, RAID 6 the random read performance is good; because not only have to verify the data written to each hard drive and want to check the hard disk in a special write data, RAID 6 poor random write performance . RAID 6 sustained write performance of the general, using small blocks of data in the performance of a good time. Overall, RAID 6 have faster read performance, higher fault tolerance. But at the same time, RAID 6 there are shortcomings very slow write speed, RAID controller design more complex and costly.
Redundant Array of Independent Disks All RAID controller levels and types RAID is more emphasis on data security, and because of the high cost, so not suitable for all enterprises, for the data in terms of general safety, RAID 5 or more appropriate, and only high-security data, only RAID 6 technology needs.
RAID Controller Levels And Types RAID 7: Optimization of high-speed data transfer disk structure. all the I / O transmission are synchronized, can be controlled separately, so that the parallel system is improved, and improving the speed of the system to access the data; each disk comes with high-speed buffer memory, real-time operating system can use any real-time operation chip, to achieve different needs of real-time systems.
RAID Controller Levels And Types RAID 10: disk structure with high reliability and high efficiency. A band structure and a mirror structure. The new structure have high prices, poor scalability. Capacity is not used, but require speed and error control of the database.
Redundant Array of Independent Disks RAID Controller Levels And Types RAID 50: called distribution of parity bit array bands. similar with RAID 30, it has the common characteristics of RAID 0 and RAID 5. It consists of two RAID 5 disk component (at least 3 each), each group has used the distributed parity bit, and then set up two hard drives into a RAID 0, experimental data collected across the disk. RAID 50 provides reliable data storage and excellent overall performance, and support for larger volume sizes. Even if the failure of two physical disks (one for each array), data can also be successfully restored. RAID 50 requires a minimum of six drives, it is the most suitable choice for high reliability storage, high read speed, high-performance data transmission applications. These applications include transaction processing, and there are many users accessing small files of office applications.
How to set up RAID drives and enhance hard disk performance
RAID Controller Levels And Types RAID 53: High data transfer disk structure. Structure similar with the the data section of Level 0 array, where each section is a RAID 3 array. It’s redundant and fault tolerance similar with RAID 3. This requires a high data transfer rate, but it is expensive and inefficient.
Redundant Array of Independent Disks RAID Controller Levels And Types RAID 1.5: a new disk array, it has the characteristics of RAID 0 +1, which the different is that its realization requires only two drives. RAID 1.5 is also a disk array model which can not use all disk space, therefore, two 80 GB hard disk after formed RAID 1.5, and is the same as RAID 1.
