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Multimedia and Mass Storage ? Raid Explained

Free Essay Sample «Multimedia and Mass Storage ? Raid Explained»

RAID or Redundant Array of Inexpensive Disks is basically method that combines multiple hard disks into a single logical unit for attaining high availability, better performance, and greater resilience in comparison to a single disk drive. Benefits derived from use of the process is real time data recovery, uninterrupted access to data in case of failure of a hard drive, increase in system uptime and network availability, protection against data loss, and increased system performance. Raid can be software or hardware based. Software systems generate Raid algorithm using server CPU and is cheap but can severely limit raid performances. Hardware raid rhythms are generated on controller board keeping the server free, are robust and bit expensive. Various Raid levels are 0 through7, 10 and 0+1. RAID 2 uses byte level striping with Hamming Code and14 disks. Like RAID 2 the RAID 3 also uses byte level stripping and dedicated parity disk and XOR algorithm for generating parity. Raid 4 has one major difference Raid 3 as it uses block level stripping. RAID 4 requires at least three hard drives. To sum up one can define RAID as an acronym for redundant array of inexpensive disks or sometimes redundant array of independent disks, is a technology that allows high levels of storage reliability from low-cost and less reliable PC-class disk-drive components, via the technique of arranging the devices into arrays for redundancy.

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Multimedia and Mass Storage – Raid Explained

RAID or Redundant Array of Inexpensive Disks is bascally method that combines multiple hard disks into a single logical unit. Objective of Raid is attaining high availability, better performance, and greater resilience in comparison to a single disk drive.

Benefits derived from use of the process is real time data recovery, uninterrupted access to data in case of failure of a hard drive, increase in system uptime and network availability, protection against data loss, and increased system performance.

Raid can be software or hardware based. Software systems generate Raid algorithm using server CPU and is cheap but can severely limit raid performances. Hardware raid rhythms are generated on controller board keeping the server free, are robust and bit expensive.

Various Raid levels are 0 through7, 10 and 0+1. “RAID levels 2, 4, 6, 7 & 0+1 are a combination of the other RAID levels shown.” 

RAID 2 is highly complex in nature and expensive as well. Hence it is not popular. It uses byte level striping with error correcting code known as Hamming Code. Usually 14 disks are required including 10 data disks and 4 ECC disks. Data is split at bit level over a number of data and ECC disks.

“Every time data is written to the array, the Hamming codes are calculated and written to the ECC disks. When the data is read from the array, these ECC codes are read as well to confirm that no errors have occurred since the data was written. If a single-bit error occurs, it can be corrected immediately.” 

Like RAID 2 the RAID 3 also uuses byte level stripping and dedicated parity disk. Error correcting method however is different as Raid 3 uses XOR algorithm for generating parity.

“RAID 3 is a practical solution that delivers good performance and fault tolerance. The dedicated parity disk does slow down write speeds though, because the parity information has to be written to the parity drive whenever a write occurs. RAID data recovery however, is not as big an issue with this implementation. RAID 3 requires at least 3 hard drives. 

Similar to Raid 3, Raid 4 has one major different with it as it uses block level stripping and the user can change strip size to suit the required application. “RAID 4 requires at least three hard drives. Like RAID 3, it offers good performance and fault tolerance, and RAID data recovery isn't as much of a concern. The dedicated parity disk however, remains the bottleneck. RAID 4 improves performance by striping data across many disks in blocks. It provides fault tolerance through a dedicated parity disk.”

To sum up one can define RAID as “an acronym for redundant array of inexpensive disks or sometimes redundant array of independent disks, is a technology that allows high levels of storage reliability from low-cost and less reliable PC-class disk-drive components, via the technique of arranging the devices into arrays for redundancy.” (Source:  David A. Patterson, Garth A. Gibson, and Randy Katz - University of California, Berkeley - Redundant array of inexpensive disks- 1987)

Free Essay Sample «Multimedia and Mass Storage ? Raid Explained»

 

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