MicroNet Technology RAIDBank4 manual Appendix B RAID Level Comparison Table

B-RAID Level Comparison Table

Appendix B: RAID Level Comparison Table

RAID

Description

M i n .

Max.

Capacity

Fault Tolerance

Data

I/O

Level

Drives

Drives

Transfer Rate

Request Rates

0

Also known as striping

1

4

( N )

No fault tolerance

Very High

Very High for

Data

distributed across multiple

Disks

Both Reads and Writes

drives in the array. There is no data

protection

1

Also known as mirroring.

2

2

1 Disk

Greater

than

RAID

Reads are higher

Reads are twice faster

All data replicated on 2 Separate

3,5

Than a single disk;

than a single disk;

disks. This is a high availability

Writes

similar

to a

Write are similar to a

Solution,

single disk

single disk.

10

Also

known as Block-Interleaved

4

4

( N / 2 )

Greater

than

RAID

Transfer

rates

more

Reads are twice faster

Parity. Data and parity information

Disks

3,5

similar to RAID 1 than

than a single disk;

is subdivided and distributed across

RAID 0

all disk. Parity must be the equal

Writes are similar to a

to the smallest disk capacity in the

single disk.

array.

Parity

information normally

stored on a dedicated parity disk.

3

Also

known as Bit-Interleaved

3

4

( N - 1 )

Lower than RAID 1,

Reads are similar to

Reads are approximately

Parity. Data and parity information

Disks

10

RAID 0;

twice as fast as a single

is subdivided and distributed across

greater than a single

disk;

all disk. Parity must be the equal

drive

Writes are slower than

to the smallest disk capacity in the

a single disk

Writes are similar to a

array.

Parity

information normally

single disk.

stored on a dedicated parity disk.

5

Also

known

Block-Interleaved

3

4

( N - 1 )

Lower than RAID 1,

Reads are similar to

Reads are similar to

Distributed Parity.

Disks

10

RAID 0;

RAID 0;

Data and parity information is

greater than a single

subdivided and distributed across

drive

Writes are slower than

Writes are slower than a

all disk. Parity must be the equal

a single disk

single disk.

to the smallest disk capacity in the

array.

Parity

information normally

stored on a dedicated parity disk.

RAIDBank4 Owner’s Manual 53