Dell PowerEdge Expandable RAID Controller 3 Podręcznik Użytkownika Pobierz pdf (Strona 28)

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DELL PERC H700 and H800 Technical Guide 28

Figure 10. Example of RAID 60 (6 + 0)

Advantages of RAID 60

 Allows creation of largest RAID groups, up to 256 drives (theoretical); large RAID volumes are

allowed for up to 192 drives connected to PERC H800

 High degree of fault tolerance due to 2 parity calculations being done for each RAID 6 subset

 Medium-to-high write transaction rate

Disadvantages of RAID 60

 One of the more complex RAID implementations

 Less space-efficient than RAID 6 since separate parity calculations are done for each RAID 6

subset

 Retrieval of parity information after a drive failure takes longer than using a mirrored solution

Drive 1

Drive 2

Drive 3

Drive 5

Drive 6

Drive 7

Parity

Generation

Data 1

Q parity

P parity

Parity

Generation

RAID 0

RAID 6

Q parity

P parity

Q parity

P parity

Drive 4

Q parity

P parity

Q parity

P parity

Drive 8

Data 2

Data 3

Data 4

Data 5

Data 6

Data 8

Data 10

Data 7

Data 15

Data 9

Data 16

Data 11

Data 12

Data 13

Data 14

1 2 ... 23 24 25 26 27 28 29

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