Fault Tolerance; Raid 0 (Data Striping) (S1-S4) Of Data Blocks (B1-B12) - HP ProLiant ML110 G1 User Manual

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Figure 5 RAID 0 (data striping) (S1-S4) of data blocks (B1-B12)

For data in the array to be readable, the data block sequence within

each stripe must be the same. This sequencing process is performed by

the array controller, which sends the data blocks to the drive write heads

in the correct order.

A natural consequence of the striping process is that each hard drive in a

given array contains the same number of data blocks.

NOTE:

If one hard drive has a larger capacity than other hard drives in the

same array, the extra capacity is wasted because it cannot be used by

the array.

Fault tolerance

Drive failure, although rare, is potentially catastrophic. For example, using

simple striping as shown in

failure of all logical drives in the same array, and hence to data loss.

To protect against data loss from hard drive failure, storage servers should

be conﬁgured with fault tolerance. HP recommends adhering to RAID 5

conﬁgurations.

The table below summarizes the important features of the different kinds

of RAID supported by the Smart Array controllers. The decision chart in

Storage management overview

B10

B11

Figure

B12

5, failure of any hard drive leads to

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