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RAID

RAID. REDUNDANT ARRAY OF INEXPENSIVE DISKS. Why RAID?. APPLICABILITY. Large Data Transfers Numerous Small Transfers. RELIABILITY. - MTTF. PERFORMANCE. Data Transfer Rate I/O performance. STORAGE CAPACITY. Parity. 1. 1. | 1. 1 0 0 1 0 1. 0. 0. 1. RAID levels.

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RAID

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  1. RAID REDUNDANT ARRAY OF INEXPENSIVE DISKS

  2. Why RAID?

  3. APPLICABILITY • Large Data Transfers • Numerous Small Transfers

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

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

  6. RAID levels

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

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

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

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

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

  12. Summary

  13. 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

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