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Transcript: RAID DISADVANTAGE RAID-6 RAID 4 comprises block-level striping with dedicated parity. RAID 4 was previously used primarily by NetApp, but has now been largely replaced by an implementation of RAID 6 (RAID-DP). Defi. & History RAID is a storage technology that combines multiple disk drive components into a logical unit for the purposes of data redundancy and performance improvement. The term "RAID" was first used by David Patterson Garth A. Gibson, and Randy Katz at the University of California, Berkeley in 1987, standing for redundant array of inexpensive disks The foremost advantage of using a RAID drive is that it increases the performance and reliability of the system.The RAIDThe parity involves that the data from the crashed system be matched up with the data that is stored in the other disk.The parity check and thus it regularly checks for any possibility of a system crash. RAID-4 RAID-2 RAID 4 comprises block-level striping with dedicated parity. RAID 4 was previously used primarily by NetApp, but has now been largely replaced by an implementation of RAID 6 (RAID-DP). Standard Levels RAID 5 comprises block-level striping with distributed parity. Unlike in RAID 4, parity information is distributed among the drives. . Upon failure of a single drive, subsequent reads can be calculated from the distributed parity such that no data is lost. . RAID 3 comprises byte-level striping with dedicated parity. All disk spindle rotation is synchronized and data is striped Parity is calculated across corresponding bytes and stored on a dedicated parity drive. Hardev Khehra DCS-1235 AGENDA RAID 0 comprises striping . This level provides no data redundancy nor fault tolerance, but improves performance through parallelism of read and write operations across multiple drives. RAID 0 has no error detection mechanism, so the failure of one disk causes the loss of all data on the array ADVANTAGE 1. Defi and History 2. Raid-0 3. Raid-1 4. Raid-2 5. Raid-3 6. Raid-4 7. Raid-5 8. Raid-6 9. Advantages 10. Disadvantages 11. Any question A major disadvantage regarding the RAID drive is that there needs to be written the drivers for a Network Operating System (NOS). Hence the major fact and also the most important usage of the RAID system is that it is essentially designed and extensively used in a server. So when the server comes into the picture, there obviously has to be a network. RAID-3 RAID- 0 RAID 2 comprises bit-level striping with dedicated Hamming-code parity. All disk spindle rotation is synchronized and data is striped such that each sequential bit is on a different drive.Hamming-code parity is calculated across corresponding bits and stored on at least one parity drive. RAID 6 comprises block-level striping with double distributed parity. Double parity provides fault tolerance up to two failed drives.As with RAID 5, a single drive failure results in reduced performance of the entire array until the failed drive has been replaced RAID-1 RAID-5 RAID-4 RAID 1 comprises mirroring. Data are written identically to two (or more) drives, thereby producing a "mirrored set". The read request is serviced by any of the drives containing the requested data. This can improve performance if data is read from the disk with the least seek latency and rotational latency.


Transcript: RAID Redundant Array of Inexpensive or Independent Disks. RAID is the term used to describe a storage systems' resilience to disk failure through the use of multiple disks and by the use of data distribution and correction techniques. Disadvantages. RAID-What is Raid? Why RAID COMMON CHARACTERISTICS Reliability Overhead Cost. Usable Storage Capacity percentage. performance. Fault tolerance and recovery. RAID LEVELS. There are 7 Basic RAID levels. RAID 0. RAID 1. RAID 2. RAID 3. RAID 4. RAID 5. RAID 6. And there are some combinations of Different RAID levels. Y.M.Rezwanul Mannaf How to Evaluate? As more devices are added reliability deteriorates. Files may be striped across multiple drives. Creating redundancy in the system. Rebuild files from redundant information. It may cause a huge loss if we fail to chose right RAID level. Affordable Alternative to Mass Storage. --> Cost/Megabyte is Dropping. -->Smaller Drive Makes it Possible. -->Obtain Performance of Expensive High End Disk. High Throughput And Reliability. -->Use of Small Diameter Disk. --> Seek Distances Lower. --> High I/O Rates and Less power. Software RAID: --> Software RAID tends to offer duplication or mirroring. --> It uses more system resources as more disk ports and channels are required. -->It is subject to additional load during write and copy operations. --> It may have lower cost than hardware RAID. Software and/or Hardware RAID RAID 0. Advantages RAID is a great system for increasing speed and availability of data. More data protection than non-RAID disk systems. Fulfills the needs of multimedia and other data hungry programs. Provides fault tolerance. Protect from MTBF. Improve performance and greater capacity. A Set of Common Physical Disks or Drives. The Operating System Views this Separate Disks as a Single Logical Disk. Data Are Distributed Across the Physical Drives of the Array. Redundant Disk Capacity is Used to Store Parity Information. Parity Information Can Help in recovering Data in Case of Disk Failure.

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