Dell POWEREDGE 4300 Service Manual page 57

Three indicator lights in each SCSI hard-disk drive carrier provide information
on the status of the SCSI hard-disk drives (see Figure 3-1). The SCSI backplane
firmware controls the drive online and drive failure indicators.
hard-disk drive
online indicator
hard-disk drive
activity indicator
hard-disk drive
failure indicator
Table 3-4 lists the drive indicator patterns established by the SCSI backplane
firmware. Different patterns are displayed as drive events occur in the system.
For example, in the event of a hard-disk drive failure, the drive failed pattern
appears. After the drive is selected for removal, the drive being prepared for
removal pattern appears, followed by the drive ready for insertion or removal
pattern. After the replacement drive is installed, the drive being prepared for
operation pattern appears, followed by the drive online pattern.
NOTE: If you do not have a Dell PowerEdge Expandable RAID Controller host
adapter card installed, you will see only the drive online and drive bay empty
indicator patterns.
Codes and Messages 3-17