Promise Technology FASTTRAK SX4300 - Manual (Page 31)

Chapter 3: FastBuild™ Utility
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4. In the Define LD Menu screen, compare the number of drives assigned to
the logical drive (Total Drv) with the disk drives listed under Drive
Assignments.
In the above example, three drives are assigned but only two appear. The
missing disk drive is the failed drive. The disk drive on Channel 2 has failed.
In an actual situation, you would replace this disk drive.
See “Installing the Disk Drives” on page 7 for help identifying Channels on
the FastTrak Controller card.
RAID 0 and JBOD
Because RAID 0 and JBOD logical drives are not fault-tolerant, there is no way to
rebuild the logical drive when a disk drive fails. After you replace the failed disk
drive, you must create a new logical drive and copy your data to it from a backup
source.