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Storage Management Overview

45NAS 2000s Administration Guide

Storage Elements Overview

Note: Each fully populated HP StorageWorks 4300/4400 Family storage enclosure supports up to

14 hard drives.

Preliminary physical storage management tasks involve managing:

■ Physical Hard Drives

■ Arrays

■ Logical Drives (LUNs)

Drive array concepts and data protection methods, including fault tolerance options are

discussed in this section. This information will help guide decisions on how to best configure

the arrays.

Physical Hard Drives

For personal or small business use, the capacity and performance of a single hard drive is

adequate. However, larger businesses demand higher storage capacities, higher data transfer

rates, and greater security from data loss if drives fail.

Merely adding extra drives to the system increases the total storage capacity, but has little

effect on the system efficiency, because data can only be transferred to one hard drive at a time.

Figure 20 illustrates the read/write process with separate physical hard drives.

Figure 20: Separate physical drive (P1, P2, P3) read/write (R/W) operations

Arrays

With an array controller installed in the system, the capacity of several physical drives can be

logically combined into one or more logical units 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.

R/W

P1 P2 P3

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HP 2000s Betriebsanweisung Seite 45