Arrays; Configuring Arrays From Physical Drives - HP ProLiant ML110 G1 User Manual

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•

Analyze the current ﬁle server structure and environment.

•

Plan properly to ensure the best conﬁguration and use of storage.

• Determine the desired priority of fault tolerance, performance,

and storage capacity.

• Use the determined priority of system characteristics to

determine the optimal striping policy and RAID level.

•

Include the appropriate number of physical drives in the arrays to

create logical storage elements of desired sizes.

Arrays

See

Figure

of several physical drives (P1–P3) can be logically combined into one or

more logical units (L1) called arrays. When this is done, the read/write

heads of all the constituent physical drives are active simultaneously,

dramatically reducing the overall time required for data transfer.

NOTE:

Depending on the storage server model, array conﬁguration may not

be possible or necessary.

Figure 4 Conﬁguring arrays from physical drives

Because the read/write heads are simultaneously active, the same amount

of data is written to each drive during any given time interval. Each unit of

data is termed a block. The blocks form a set of data stripes over all the

hard drives in an array, as shown in

4. With an array controller installed in the system, the capacity

HP ProLiant Storage Server user guide

Figure

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