Compaq StorageWorks 4000 - RAID Array Uživatelská příručka stáhnout pdf (Strana 144)

The information in this appendix describes hard drive array concepts, data

protection methods, including fault-tolerance options, and data reliability

features of the Compaq RA4000 Controller installed in the Compaq RA4000.

Before configuring the RA4000 Controller, review the following general

information so that you will be familiar with the terms and concepts required

for configuration.

A drive array is a collection of hard drives (physical drives) grouped together

to create an array of physical drives. An array is made up of one or more

subsets called logical drives (sometimes called logical volumes) that are

spread across all physical drives in the array. Operating systems view logical

drives as a single, contiguous storage space although it is made up of parts of

several physical drives.

The generic drive array illustrated in Figure E-1 consists of two logical drives

spread across three physical drives. Figure E-2 through Figure E-4 illustrate

other drive array configurations.

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Compaq StorageWorks 4000 - RAID Array Uživatelská příručka Strana 144