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RAID and Storage Arrays

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A Brief and Basic Explanation on RAID and storage arrays

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RAID and Storage Arrays

  1. 1. RAID And Storage Arrays Chris Pierce
  2. 2. Definitions: Array - a systematic arrangement of objects. RAID - Redundant Array of Independent Disks In plain english please? RAID is an umbrella term used for any method that divides or replicates data across multiple hard disk drives.
  3. 3. Types of RAID: RAID 0 - Striped Disks Disk 1 Disk 2 Data is thrown across both disks allowing for increased Data “A” RAID Controller performance but with the A1 A2 cost of 0 redundancy. A3 A4 A5 A6
  4. 4. Types of RAID: RAID 0 - Striped Disks Disk 1 Disk 2 Data is thrown across both disks allowing for increased Data “A” RAID Controller performance but with the A1 A2 cost of 0 redundancy. A3 A4 A5 A6
  5. 5. Types of RAID: RAID 0 - Striped Disks Disk 1 Disk 2 Data is thrown across both disks allowing for increased Data “A” RAID Controller performance but with the A2 cost of 0 redundancy. A4 A6
  6. 6. Types of RAID: RAID 1 - Mirroring Disks Data is replicated across Disk 1 Disk 2 both disks allowing for Data “A” RAID Controller increased redundancy with A1 A1 a only a small performance cost. A2 A2 A3 A3
  7. 7. Types of RAID: RAID 1 - Mirroring Disks Data is replicated across Disk 1 Disk 2 both disks allowing for Data “A” RAID Controller increased redundancy with A1 A1 a only a small performance cost. A2 A2 A3 A3
  8. 8. Types of RAID: RAID 1 - Mirroring Disks Data is replicated across Disk 1 Disk 2 both disks allowing for Data “A” RAID Controller increased redundancy with A1 A1 a only a small performance cost. A2 A2 A3 A3
  9. 9. Types of RAID: RAID 1 - Mirroring Disks Data is replicated across Disk 1 Disk 2 both disks allowing for Data “A” RAID Controller increased redundancy with A1 A1 a only a small performance cost. A2 A2 A3 A3
  10. 10. Types of RAID: RAID 5 - Striped Parity Disk 1 Disk 2 Disk 3 Data “A” RAID Controller A1 A2 P1 Data is striped across P2 A3 A4 multiple disks and a parity bit is written for redundancy. A5 P3 A6
  11. 11. Types of RAID: RAID 5 - Striped Parity Disk 1 Disk 2 Disk 3 Data “A” RAID Controller A1 A2 P1 P2 A3 A4 A5 P3 A6
  12. 12. Types of RAID: RAID 5 - Striped Parity Disk 1 Disk 2 Disk 3 Data “A” RAID Controller A1 A2 P1 P2 A3 A4 A5 P3 A6
  13. 13. Types of RAID: RAID 5 - Striped Parity (Cont.) Disk 1 Disk 2 Disk 3 010011 RAID Controller Parity is checked across the array. If the data written is added to be even then the parity bit is 0. If the data written is odd, the parity bit is set to 1
  14. 14. Types of RAID: RAID 5 - Striped Parity (Cont.) Disk 1 Disk 2 Disk 3 010011 RAID Controller 0 1 Parity is checked across the array. If the data written is added to be even then the 0 0 parity bit is 0. If the data written is odd, the parity bit is set to 1 1 1
  15. 15. Types of RAID: RAID 5 - Striped Parity (Cont.) Disk 1 Disk 2 Disk 3 010011 RAID Controller 0 1 1 Parity is checked across the array. If the data written is added to be even then the 0 0 0 parity bit is 0. If the data written is odd, the parity bit is set to 1 1 0 1
  16. 16. Types of RAID: RAID 5 - Striped Parity (Cont.) Disk 1 Disk 2 Disk 3 010011 RAID Controller 0 1 1 Parity is checked across the array. If the data written is added to be even then the 0 0 0 parity bit is 0. If the data written is odd, the parity bit is set to 1 1 0 1
  17. 17. Types of RAID: RAID 5 - Striped Parity (Cont.) Disk 1 Disk 2 Disk 3 010011 RAID Controller 0 1 1 Parity is checked across the array. If the data written is added to be even then the 0 0 0 parity bit is 0. If the data written is odd, the parity bit is set to 1 1 0 1
  18. 18. Other RAID Configurations: Don’t be confused by RAID 50, RAID 10, RAID 51, or other High Number RAID Configurations. RAID 50 = RAID 5 + RAID 0 RAID 10 = RAID 1 + RAID 0 RAID 51 = RAID 5 + RAID 1
  19. 19. What RAID is NOT! RAID is NOT data backup - Data can still become damaged in a RAID array. RAID is NOT immune to viruses and other disasters that could potentially cause data loss. RAID is NOT an insecticide used to “Kill Bugs Dead” by SC Johnson Company.
  20. 20. What RAID is NOT! RAID is NOT data backup - Data can still become damaged in a RAID array. RAID is NOT immune to viruses and other disasters that could potentially cause data loss. RAID is NOT an insecticide used to “Kill Bugs Dead” by SC Johnson Company.
  21. 21. Questions? cpierce@csdurant.com www.twitter.com/cpiercecs

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