How raid different types of disks are organized

RAID (Redundant array of independent disks )    

RAID is an abbreviation for the English Redundant array of independent disks, which is known as a redundant array of independent disks . RAID technology is divided into several different levels, each of which offers different speeds, security and cost-performance. Depending on the actual situation, selecting the appropriate RAID level can meet the user 's requirements for storage system availability, performance, and capacity. The commonly used RAID levels are the following:RAID0,RAID1,raid0+1,RAID3,RAID5, etc.

I. RAID0 (Strip Technology)   

RAID 0 requires at least two or more drives, which combine two or more hard drives into a single piece, and the data is continuously partitioned on each disk. Because the bandwidth doubles, the read/write speed doubles, but RAID 0 improves performance without providing data protection, so long as any piece of hard drive is damaged, all data is lost. Therefore, RAID 0 cannot be applied to critical areas where data is highly available. RAID0 work

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two. RAID1 (mirror Technology)  

    RAID1 through disk data mirroring implementation data redundancy disk array disk array disk array It's very safe, but it's more expensive. A RAID disk array solution , because two hard drives can only provide the capacity of a piece of hard disk. RAID1 disk array

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three. RAID5 (mirror Technology)  

   RAID5 is a storage performance,Data Securityand theStorage -cost-balanced storage solutions. RAID5 has the same data reading speed as the RAID0, just one moreParity Checkinformation, the speed at which data is written is compared to a singleDiskThe write operation is slightly slower. And because multiple data corresponds to aParity Checkinformation, the RAID5 disk space utilization is (n-1)/n. RAID5 uses at least 3 hard drives to build a RAID5 disk array, and when data is written to the hard disk, RAID5 data writing generates data content and checksum information based on the algorithm,RAID5 stores the data and the corresponding parity information on each disk that makes up the RAID5, and the parity information and the corresponding data are stored on separate disks, where the complete data is stored on any N-1 block disk. This means that there is space equivalent to a disk capacity for storing parity information. Therefore, when a disk in RAID5 is damaged, the data integrity is not affected, thus ensuring data security. When the damaged disk is replaced, the raid also automatically rebuilds the data on the disk with the remaining parity information to maintain the RAID5 's high reliability.

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This article from "Remnant Dream" blog, declined reprint!

How raid different types of disks are organized