Areca ARC-1882LP User Manual download pdf (Page 196)

APPENDIX

196

Summary of RAID Levels

6Gb/s SAS RAID controller supports RAID Level 0, 1, 10(1E), 3, 5, 6,

30, 50 and 60. The following table provides a summary of RAID levels.

RAID Level Comparsion

RAID

Level

Description Disks

Requirement

(Minimum)

Data

Availability

0 Also known as striping.

Data distributed across multiple

drives in the array. There is no data

protection.

1 No data

Protection

1 Also known as mirroring.

All data replicated on 2 separated

disks. N is almost always 2. Due to

this is a 100 % duplication, so is a

high costly solution.

2 Up to one disk

failure

10(1E) Also known as mirroring and striping.

Data is written to two disks

simultaneously, and allows an odd

number or disk. Read request can be

satised by data read from wither one

disk or both disks.

3 Up to one disk

failure in each

sub-volume

3 Also known Bit-Interleaved Parity.

Data and parity information is

subdivided and distributed across all

data disks. Parity information normally

stored on a dedicated parity disk.

3 Up to one disk

failure

5 Also known Block-Interleaved

Distributed Parity.

Data and parity information is

subdivided and distributed across all

disk. Parity information normally is

interspersed with user data.

3 Up to one disk

failure

6 RAID 6 provides highest reliability,

but not widely used. Similar to RAID

5, but does two different parity

computations or the same computation

on overlapping subsets of the data.

The RAID 6 can offer fault tolerance

greater that RAID 1 or RAID 5 but only

consumes the capacity of 2 disk drives

for distributed parity data.

4 Up to two disk

failure

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