Hp StorageWorks 1000 Modular Smart Array Manuel d'utilisateur télécharger pdf (Page 49)

HP StorageWorks 1000/1500 Modular Smart Array Command Line Interface user guide 49

Figure 8 RAID 6 array, with four physical hard drives (D1, D2, D3, and D4) showing distributed parity

information (Px,y)(Qx,y)

This method is most useful when data loss is unacceptable, but cost is also an important factor. The

probability that data loss will occur when arrays are configured with RAID 6 is less than when they are

configured with RAID 5.

Table 6 RAID 6 features

Advantages Disadvantages

High read performance. Relatively low write performance (lower than RAID

5), because of the need to create two sets of parity

data.

High data availability—Any two drives can fail

without loss of critical data.

More drive capacity is usable than with RAID

1+0—Parity information requires only the storage

equivalent to two physical drives.

P5,6

Q7,8

D1 D2 D3 D4

P3,4

Q5,6

P1,2

Q3,4

P7,8

Q1,2

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Hp StorageWorks 1000 Modular Smart Array Manuel d'utilisateur Page 49