1. RAID REDUNDANT ARRAY OF INEXPENSIVE DISKS

2. Why RAID?

3. APPLICABILITY Large Data Transfers Numerous Small Transfers

4. RELIABILITY STORAGE CAPACITY PERFORMANCE - MTTF -Data Transfer Rate -I/O performance

5. Parity 1 0 0 1 0 1 | 1 1 1 0 0 1

6. RAID levels

7. RAID 0: NON-REDUNDANT STRIPING Disk 0 Disk 3 Disk 2 Disk 1

9. RAID 1: MIRRORED DISKS Disk 0 Disk 3Disk 2 Disk 1

11. RAID 2: HAMMING CODE Disk 0 Disk 3 Disk 2 Disk 1 Disk 4 Disk 6 Disk 5 DATA DISKS PARITY OR CHECK DISKS

12. Hamming Code (ECC)

13. RAID 3: SINGLE CHECK DISK Disk 0 Disk 3 Disk 2 Disk 1 Disk 5 DATA DISKS PARITY OR CHECK DISK

15. RAID 4: INDEPENDENT DISKS Disk 0 Disk 3 Disk 2 Disk 1 Disk 5 DATA DISKS PARITY OR CHECK DISK

17. Disk 5 RAID 5: NO SINGLE CHECK DISK Disk 0 Disk 3 Disk 2 Disk 1

19. Summary

20. Conclusions RAID provides an effective solution for disk drive performance and reliability issues Can be adjusted to meet specific requirements Can be hardware or software based