Each hard drive has a group of three status LEDs, as shown in the following figure. Both disk-based hard drives and flash SSDs use the same set of LEDS.
Note - The OK/Activity LED has slightly different behavior for SSDs than for disk-based drives. This difference is described in the table that follows the figure.
Figure 63 Hard Drive LEDs
The following table explains how to interpret the hard drive status LEDs.
Table 42 Status LEDs for Hard Drives
Note - The front and rear panel Service Required LEDs are also lit when the system detects a hard drive fault.