Apple Xserve RAID User's guide Technical Information download pdf (Page 15)

Working With RAID Arrays

Use RAID Admin and Disk Utility to configure arrays and

volumes and use Fibre Channel Utility to refine fibre

channel performance.

Once you’ve configured the Xserve RAID system with basic settings, you can create

RAID arrays (also known as RAID sets). For explanations of RAID levels and

combinations offered by the Xserve RAID system, see Chapter 7, “RAID Overview,” and

Chapter 8, “Planning RAID Storage for the Xserve RAID System,” in the

Xserve RAID User’s

Guide.

Creating a RAID Array

You use the Create Array window of RAID Admin to set up an array. This window lists

the hardware RAID levels you can create and displays a picture of the system’s front

panel so that you can easily choose the drives to include in each array. A checkbox is

on each available drive in the picture.

Note:

The Xserve RAID system uses two RAID controllers. The upper controller manages

drives 1 through 7 on the left side of the system (when viewed from the front); the

lower controller manages drives 8 through 14 on the right side. If your system has

fewer than 14 drives, you may want to rearrange the drive modules to take advantage

of both RAID controllers, which provide greater performance and redundancy.

You cannot create a RAID array that spans both controllers. (You can use Disk Utility to

add software RAID to two or more arrays, however; see “Adding Software RAID to Two

or More Arrays” on page 21 for details.)

Important:

Do not remove drive modules when the Xserve RAID system is powered.

When the system is powered on and you remove a drive module that is a member of a

RAID array, the array will either become degraded or will be lost if the RAID level is

unprotected.

Any drives not used in an array are treated as global spares (also called “hot spares”) for

all arrays on that controller.

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Apple Xserve RAID User's guide Technical Information Page 15