RAID Levels

RAID 0

• Disk Striping
• No Fault Tolerance
• 100% of Disk capacity available
• Performance is very high
• Minimum 2 disks required

RAID 1

• Disk Mirroring
• Highest Level Of Fault Tolerance
• 50% of Used Disk capacity available
• Performance is high
• Minimum 2 disks required

RAID 3

• Disk Stripping with dedicated parity
• High Level Of Fault Tolerance
• Capacity = [(n-1)/n]*100%
• Performance is very high
• Minimum 3 disks required

RAID 5

• Disk Stripping with distributed parity
• High Level Of Fault Tolerance
• Capacity = [(n-1)/n]*100%
• Performance is very high
• Minimum 3 disks required

RAID 10

• Mirroring over stripped Disk set
• High Level Of Fault Tolerance
• Capacity = 50% of disk used
• Performance is very high
• Minimum 4 disks required
• Used in mission critical environment, where price sits at lower bench than
  performance and availability factors.