RAID 50 can sustain one to four drive failures while maintaining data integrity, if each failed disk is in a different RAID 5 array.

Uses

Works best when used with data that requires high

 

reliability, high request rates, high data transfer, and

 

medium to large capacity.

 

 

Strong Points

Provides high data throughput, data redundancy, and very

 

good performance.

 

 

Weak Points

Requires 2 to 4 times as many parity drives as RAID 5.

 

 

Drives

6 to 30

 

The initiator takes one ID per channel. This leaves 15 IDs

 

available for each channel.

 

 

Figure 3.5 shows a RAID 50 array with six disk drives.

Figure 3.5 RAID 50 Array

MegaRAID Controller

 

 

 

Data Flow

 

 

 

RAID 5

 

 

RAID 5

 

Disk 1

Disk 2

Disk 3

Disk 4

Disk 5

Disk 6

Segment 1

Segment 2

Parity (1-2)

Segment 3

Segment 4

Parity (3-4)

Segment 6

Parity (5-6)

Segment 5

Segment 8

Parity (7-8)

Segment 7

Parity (9-10)

Segment 9

Segment 10

Parity (11-12)

Segment 11

Segment 12

 

 

 

RAID 0

 

 

3-8

RAID Levels

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