Apple Xserve RAID User's guide Technical Information download pdf (Page 18)

18 Chapter 2 Working With RAID Arrays

Rebuilding a RAID Array

If a drive fails and the array RAID level is 1, 3, 5, or 0+1, data availability will be

unaffected, but the data is no longer protected. The array is in a degraded state. The

RAID controller that controls the affected array will automatically attempt to

reconstruct the data in order to return the system to a protected state. For example, if a

hot spare drive is available when a drive fails in an array, the controller takes the

available drive and integrates it into the array. The controller then rebuilds the RAID

array using the new drive.

Array performance will be diminished until the drive is rebuilt. During this rebuilding

process, an indicator on the drive module being added to the array alternately flashes

amber and green. The system displays a warning signal (yellow) in the main RAID

Admin when an array is degraded. Rebuilding progress is shown in the Arrays & Drives

monitoring pane.

The Xserve RAID system automatically rebuilds a RAID array in certain instances.

• If you have created a protected array (RAID 1, 3, 5, or 0+1) and you have an

unassigned drive (a hot spare), each RAID controller automatically uses the spare

drive to rebuild the array if a drive in the array fails.

• If no hot spare drive is available on the RAID controller, the array operates in a

degraded state until you replace the failed drive.

• If you have a RAID 0 array, the system cannot rebuild the array in the event of a drive

failure or other interruption. All data on the array will be lost.

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Apple Xserve RAID User's guide Technical Information Page 18