User guide
RAID Utility User Guide 15
If a Drive Fails
If a RAID set or volume becomes degraded because a drive has failed, you can use
RAID Utility to identify the drive that needs to be replaced.
Note: If your RAID setup includes a spare drive, it is automatically incorporated into the
RAID set, and the set switches from degraded to good as soon as the recovery process
nishes. If there is no spare, the set remains degraded until you replace the failed drive,
and if a second drive fails before you replace the rst, you could lose data.
To replace a failed drive:
1 Open RAID Utility, select the RAID set or volume that is displaying a problem status
indicator, and look for a drive bay with a red status indicator.
The bay numbers in RAID Utility correspond to the numbered drive bays in your
Mac Pro or Xserve.
2 Replace the bad drive module.
3 Use the Make Spare command to set up the new drive as a global spare.
If no spare was available when the original drive failed, the RAID card uses the new
spare immediately to rebuild the aected RAID set and volumes. If a spare was
available at the time of the failure, it is already incorporated into the aected RAID set,
and the new spare remains available until it’s needed.
If SMART Status is Listed as Unsupported
Self-Monitoring, Analysis, and Reporting Technology (SMART) status information
is available only for SATA drives. If you are using SAS drives, SMART is listed as
unsupported in the drive information in RAID Utility.
Using the Command Line
You can also set up and manage your RAID card from the command line using the
raidutil command. For information, see the raidutil man page or enter raidutil at
the command-line prompt.