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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 was first Redundant Array of Inexpensive Disk. There are several types of RAID and I&amp;#x2019;ll cover 3 main types with the time I have.
• RAID 0 isn&amp;#x2019;t really RAID because it lacks the &amp;#x201C;R&amp;#x201D;edundancy
RAID 0 requires a minimum of 2 disks.
RAID 0 space is the size of both disk combined together (Example: 2x160GB HDD = 320GB)
• RAID 0 isn&amp;#x2019;t really RAID because it lacks the &amp;#x201C;R&amp;#x201D;edundancy
RAID 0 requires a minimum of 2 disks.
RAID 0 space is the size of both disk combined together (Example: 2x160GB HDD = 320GB)
• RAID 0 isn&amp;#x2019;t really RAID because it lacks the &amp;#x201C;R&amp;#x201D;edundancy
RAID 0 requires a minimum of 2 disks.
RAID 0 space is the size of both disk combined together (Example: 2x160GB HDD = 320GB)
• RAID 1 allows for redundancy of data.
RAID 1 requires a minimum of 2 disks.
RAID 1 space is the size of the smallest disk (Example 2 160GB HDD&amp;#x2019;s = 160GB)
• RAID 1 allows for redundancy of data.
RAID 1 requires a minimum of 2 disks.
RAID 1 space is the size of the smallest disk (Example 2 160GB HDD&amp;#x2019;s = 160GB)
• RAID 1 allows for redundancy of data.
RAID 1 requires a minimum of 2 disks.
RAID 1 space is the size of the smallest disk (Example 2 160GB HDD&amp;#x2019;s = 160GB)
• RAID 5 allows for redundancy of data with performance increase.
RAID 5 requires a minimum of 3 disks.
RAID 5 space is the size of the number of disk minus 1 (n-1) (Example 3 160 HDD&amp;#x2019;s=320GB)
• RAID 5 allows for redundancy of data with performance increase.
RAID 5 requires a minimum of 3 disks.
RAID 5 space is the size of the number of disk minus 1 (n-1) (Example 3 160 HDD&amp;#x2019;s=320GB)
• RAID 5 allows for redundancy of data with performance increase.
RAID 5 requires a minimum of 3 disks.
RAID 5 space is the size of the number of disk minus 1 (n-1) (Example 3 160 HDD&amp;#x2019;s=320GB)
• RAID 5 can Self Heal with the addition of a HOT SPARE Disk.
• RAID 5 can Self Heal with the addition of a HOT SPARE Disk.
• RAID 5 can Self Heal with the addition of a HOT SPARE Disk.
• RAID 5 can Self Heal with the addition of a HOT SPARE Disk.
• Raid 50 and other are just a lazy way of writing it without the &amp;#x201C;+&amp;#x201D; sign.
• Thank You!
• ### 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.