Summary of Functions of raid0, raid1, raid10, RAID5, raid50, raid6, and raid60

1. raid0 features: data is split on several disks using strip. Data is divided into many data blocks, each of which is written to a different disk. Therefore, the workload of each disk is reduced, which helps accelerate data transmission. Raid-0 makes the disk better respond, especially for email, database, and Internet applications. Raid-0 requires at least two hard disks. Advantage: by distributing I/O load to multiple hard disks, the system performance can be improved. Easy to implement. Note that raid-0 does not provide data protection and is not suitable for key data. 2. Features of raid1: Raid-1 is implemented through Disk Images and is mainly used to ensure data reliability. The same data will be copied and stored on different disks. If a disk fails, you can find the corresponding data on a disk in the array, therefore, it is easy to recover. Images can not only create redundant data to bring high availability, but also ensure the normal operation of key applications. Advantage: Data Reading performance is improved, while data writing performance is no different from that of a single disk. 100% data redundancy means that data does not need to be rebuilt in the case of a disk failure. Note: inefficient use of disk capacity-the maximum cost (100%) for all RAID types ). 3. Raid 10 features: Raid-10 is a combination of RAID-1 and raid-0. This configuration requires at least four hard disks. In all RAID levels, the performance, protection function, and capacity are the best. Raid-10 contains paired image disks, whose data is stripped from the entire array. In most cases, raid-10 can withstand failures of multiple disks, so it can ensure the normal operation of the system. The probability of data loss is minimized. Advantage: it has the same redundancy as RAID-1 (image) and is an ideal choice for data protection. Note that the price may be high, depending on the image disk array. 4. RAID 5 features: Raid-5 uses a technology called parity check to maintain data redundancy. When data is stripped from multiple disks, the parity data is also included and distributed across all disks in the array. Parity data is used to maintain data integrity and re-build when the disk fails. If a disk in the array fails, the lost data can be reconstructed based on the parity data of other disks. Raid-5 requires at least three hard disks. Advantage: more effective use of the disk capacity of all redundant RAID configurations. Maintain good read/write performance. Note that disk failure affects the throughput rate. The reconstruction information after the fault takes longer than the image configuration. 5. Raid 50 features: Raid-50 is a combination of RAID-5 and raid-0. This configuration is used to strip data that includes parity information on each disk of the raid-5 sub-disk group. Each raid-5 sub-disk group requires three hard disks. Raid-50 is highly fault tolerant because it allows a disk in a group to fail without data loss. In addition, the reconstruction speed is greatly improved because the parity bit is deployed on the raid-5 sub-disk group. Advantage: higher fault tolerance capability and the potential for faster data reading speed. Note that disk failure affects throughput. The reconstruction information after the fault takes longer than the image configuration. 6. Features of raid6: raid6 performance: (1) random read performance of raid6: Good (when using big data blocks ). (2) random Write Performance of RAID 6: poor, because not only do you need to write validation data on each hard disk, but also write data on a dedicated validation hard disk. (3) continuous reading performance of RAID 6: Good (when using small data blocks ). (4) continuous Write Performance of RAID 6: average. (5) Advantages of raid6: fast reading performance and higher fault tolerance capability. (6) Disadvantages of raid6: Low write speed. Raid controllers are more complex in design and cost-effective. 7. raid60 features: higher fault tolerance, support for fault fixing for two hard disks at the same time, and higher read performance. There are still some technical problems, which are not mature enough and few users currently.