Apple Xserve RAID User's guide User's Guide download pdf (Page 14)

14 RAID Utility User Guide

Verifying a RAID Set

You can use the Verify RAID Set command to conrm that data stored on a RAID 1,

RAID 0+1, or RAID 5 volume is protected.

The performance of the RAID set and any volume based on it is degraded during

verication.

To verify a RAID set:

1 Open RAID Utility.

2 Select the RAID set in the left column.

3 Click Verify RAID Set.

If the verication process reports problems, you can use the command

$ raidutil modify volume --rewrite

in Terminal to recreate the volume’s data protection information. For information, see

the raidutil man page or enter raidutil at the command-line prompt.

If a Volume is Degraded

A degraded volume is either not providing full performance or has lost its ability to

guarantee data protection. All data on a degraded volume is available, but data will be

lost if a drive fails. A volume’s status is listed as degraded:

While the volume is being created. This is normal, and the volume’s status changes Â

from degraded to good as soon as initialization is nished.

When a drive fails in the RAID 1, RAID 5, or RAID 0+1 set that the volume is based Â

on. The volume remains in a degraded state until you replace the faulty drive or

until an available spare is integrated into the RAID set.

While the RAID set that the volume is based on is recovering from a loss of data Â

redundancy. The volume’s status changes from degraded to good as soon as the

recovery process in nished.

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Apple Xserve RAID User's guide User's Guide Page 14