RAID 0 RAID 0 (Data Stripping ). The data on the entire Logical Disk is distributed across multiple physical disks, and can be read/written in parallel to provide the fastest speed, but there is no redundancy capability. At least two disks are required. We can use RAID 0 to obtain a larger capacity for a single logical disk, and get a higher access speed by simultaneously reading multiple disks. RAID 0 first considers the disk speed and capacity, ignoring the security. As long as one of the Disks has a problem, the data in the entire array will not be guaranteed.
Q: How many disks does RAID0 have? A: RAID 0 requires at least two hard disks. RAID 1 RAID 1, also known as the image method, is the data redundancy. In the entire image process, only half of the disk capacity is valid (the other half is used to store the same data ). Compared with RAID 0, RAID 1 first considers security, halving the capacity, and changing the speed.
Q: How many disks does RAID1 have?
A: Raid 1 requires at least two hard disks.
RAID 0 + 1
To achieve high speed and security, RAID 10 (or RAID 0 + 1) can be simply split into a RAID 0 array consisting of multiple disks for mirroring.
Q: RAID0 + 1 at least a few hard disks can be implemented.
A: RAID0 + 1 requires at least four disks.
RAID 3 and RAID 5
Both RAID 3 and RAID 5 are verified. RAID 3 uses a disk to store verification data. The corresponding data verification information must be modified for any data changes. The disk that stores the data has several parallel operations, and the disk that stores the verification data has only one disk, this leads to a bottleneck in verifying data storage. RAID 5 is used to cut the data validation generated by each disk into blocks and store them in each disk that forms an array, this relieves the bottleneck during data storage verification. However, data splitting and storage control are all subject to a high speed.
FAQs
Q: How many hard disks does RAID5 need? Why is the capacity of a disk lost?
Answer: at least 3
RAID5 stores the data and the corresponding parity information on each disk that makes up RAID5, And the parity information and the corresponding data are stored on different disks respectively, any of these N-1 block disks Store complete data, that is, there is space equivalent to a disk capacity for storing parity information. Therefore, when a disk in RAID 5 is damaged, data integrity is not affected, thus ensuring data security. After a damaged disk is replaced, RAID will automatically use the remaining parity information to reconstruct the data on the disk to maintain the high reliability of RAID 5.
For more information about RAID data recovery technology, please go to the official website of Jiangmin Feike Co., http://fix.jiangmin.com.
From: Jiangmin Feike hard disk data recovery technology area, original address: http://fix.jiangmin.com/bloger/post/92.html
