Define raid structure, Database Management System

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Define raid? Briefly explain it?

A range of disk organization methods, collectively called redundant arrays of independent disks (RAID)

o   Improvement of reliability through redundancy.

o   Improvement in performance thorugh parallelism

1. Bit level striping

2. Block level striping

RAID levels

  • RAID level 0
  • RAID level 1
  • RAID level 2(memory style error correcting code)
  • RAID level 3 (Bit interleaved parity organization)
  • RAID level 4 (Block interleaved parity organization)
  • RAID level 5 (Block interleaved distributed parity)
  • RAID level 6 (P+Q redundancy)

 


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