Adaptec AHA-3980 Guía de usuario descargar pdf (Pagina 12)

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Creating and Managing Arrays

Stock Number: 510685-00, Rev. A Page: 1-4

Print Spec Number: 493069-00

Current Date: 3/3/99 ECN Date: 3/28/95

spares), which are automatically activated when an array disk fails.

A spare must have at least the capacity of the smallest disk in the

array.

Mixing Disks from Different Manufacturers

or with Different Capacities

An array can contain different models of SCSI disks, even disks with

different capacities; for example, an array can include a Quantum

340 MByte disk and a Conner 540 MByte disk. If you mix disks with

different capacities, however, the smallest disk determines the logi-

cal capacity of all other disks in the array (regardless of RAID level).

If a RAID 0 array contains one 340 MByte disk and four 540 MBytes

disks, for example, the capacity of the array is equivalent to about

five 340 MByte disks. To avoid wasted disk capacity, therefore, use

disks of similar size.

Mixing Disks on Different RAID Adapter Channels

An AHA-3980 RAID adapter has two channels: A and B. An

AHA-3985 RAID adapter has three channels: A, B, and C. Each

channel acts as an independent RAID controller, implementing a

separate SCSI bus (for more information on the AHA-3980 or

AHA-3985, see the AHA-3980/3985 User’s Guide). An array can con-

sist of disks on different channels of the same RAID adapter; how-

ever, it cannot include disks from multiple RAID adapters.

The Adaptec Array Software

Adaptec’s array software lets you perform all tasks relating to set-

ting up and managing up to four nonbootable arrays. To perform

these tasks, you use the Administrator utility. This utility lets you

■

Create the initial arrays

■

Format the arrays

■

Add, modify, or delete arrays

■

View array information

■

Perform routine management tasks such as testing spare disks,

verifying the integrity of arrays, regenerating data on replace-

ment disks, and reactivating off-line arrays and spares

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