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)