RAID

RAID -  Reduntant array of Independent Disks

Types of RAID

RAID 0

RAID 1

RAID 2

RAID 3

RAID 4

RAID 5

RAID 6

RAID 10

RAID 01

RAID 0

Block are stripped.

Minimum 2 disks

Excellent Performance

Don’t use for critical System

RAID 1

Minimum 2 Disks

Good performance

Excellent Redundancy

RAID 2

Bits Stripped
Uses Error correction codes

Minimum 2 Disks

Good performance

Excellent Redundancy

RAID 3
Bytes striped dedicated parity disk
Minimum 2 Disks

Dedicated disk to store parity and multiple disk to store data disk

Sequential read and write good random read and write worst performance

RAID 4

Blocks striped dedicated parity disk

Minimum 2 Disks

Dedicated disk to store parity and multiple disk to store data disk

Sequential read and write good random read and write worst performance

RAID 5

Minimum 3 disks

Good Performance

Good Redundancy

Best cost effective

RAID 6

Minimum 4 disks dual parity

RAID 01

Mirror of stripes

Requires minimum 3 hard disks

RAID 10

Stripe of mirrors