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Redundant Arrays of Inexpensive Disks (RAID)
RAID (redundant array of independent disks) is a concept in the storage subsystem can deliver a higher level of protection for the down-time and lost data from conventional hard disk. RAID architecture refers to the drive that is designed to protect critical data through redundancy. In theory, the RAID array that consists of a conventional disc works for hundreds or even thousands of years without loss of data due to disk failure. The ATTACK also offer other benefits: can increase input/output performance, make the service simpler and quicker and allows the user to perfecting the system drive to suit the needs of the specific application.
The concept of attack first articulated by a group of searchers back at Berkeley in 1987. Their work defined five levels of RAID: five ways to distribute the data across the array disks so that the failure of one disk does not cause data loss. The original design, the three have proven to be commercially interesting: level 1, level 3 and 5 levels. Although not strictly RAID, an additional level, level 0, it is often included among the RAID because the design similarities to the original design.
Level 0 distributes data across disks with striping-a technique to store the pieces in a row data on disk is different. Striping improves i/o throughput of data protection but gives no more than conventional drives. Level 1 achieves data redundancy through mirroring data kept identical on two separate discs. Mirroring offers excellent reliability and some improvement in i/o throughput but relatively inefficient in total disk space usage.
Level 3 and Level 5 combines the striping with parity code to allow recovery of data if a disk fails. Level 3 and Level 5 uses disk space more efficiently than level 1. There are more attacks from redundancy. RAID contributes to balancing the load automatically, avoiding the heat of the disc, where 80 percent of the i/o request is targeting 20 percent of the disk capacity. Appropriate level of attack can accelerate data transfers or handle more i/o requests per second. Level-3 drive to process large amounts of data rapidly by transferring data from all disc in parallel, shorten transfer time for applications such as image processing or CAD the reading in large files, respectively. Level-5 array can handle a large number of i/o requests simultaneously, making them suitable for applications that make many small requests.
The concept of attack first articulated by a group of searchers back at Berkeley in 1987. Their work defined five levels of RAID: five ways to distribute the data across the array disks so that the failure of one disk does not cause data loss. The original design, the three have proven to be commercially interesting: level 1, level 3 and 5 levels. Although not strictly RAID, an additional level, level 0, it is often included among the RAID because the design similarities to the original design.
Level 0 distributes data across disks with striping-a technique to store the pieces in a row data on disk is different. Striping improves i/o throughput of data protection but gives no more than conventional drives. Level 1 achieves data redundancy through mirroring data kept identical on two separate discs. Mirroring offers excellent reliability and some improvement in i/o throughput but relatively inefficient in total disk space usage.
Level 3 and Level 5 combines the striping with parity code to allow recovery of data if a disk fails. Level 3 and Level 5 uses disk space more efficiently than level 1. There are more attacks from redundancy. RAID contributes to balancing the load automatically, avoiding the heat of the disc, where 80 percent of the i/o request is targeting 20 percent of the disk capacity. Appropriate level of attack can accelerate data transfers or handle more i/o requests per second. Level-3 drive to process large amounts of data rapidly by transferring data from all disc in parallel, shorten transfer time for applications such as image processing or CAD the reading in large files, respectively. Level-5 array can handle a large number of i/o requests simultaneously, making them suitable for applications that make many small requests.
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