Datoptic RM12-S6.TB - Rackmount Manual do Utilizador descarregar pdf (Página 89)

APPENDIX

198

Summary of RAID Levels

6Gb/s SATA 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 Comparision

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

1 2 ... 84 85 86 87 88 89 90

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