Dell Precision T3400 (Late 2007) - Manual (Page 60)

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About RAID Configurations
Rebuilding a Degraded RAID Level 1 Configuration
If your computer does not have a spare hard drive, and the computer has
reported a degraded RAID level 1 volume, you can manually rebuild the
computer’s redundancy mirror to a new hard drive:
1 Click the Start button and point to Programs→ Intel(R) Matrix Storage
Manager → Intel Matrix Storage Console to launch the Intel Storage
Utility.
2 Right-click the available hard drive to which you want to rebuild the RAID
level 1 volume, and click Rebuild to this Disk.
3 You can use your computer while the computer is rebuilding the RAID
level 1 volume.