HP ProLiant ML310 G5p Server - Manual (Page 8)

Component identification 8
SAS and SATA device numbers
Hot-plug SATA or SAS hard drive LEDs
Item LED description Status
1 Fault/UID status Amber = Drive failure
Flashing amber = Fault-process activity
Blue = Unit identification is active
Off = No fault-process activity
2 Online/Activity status Green = Drive activity
Flashing green = High activity on the drive or
drive is being configured as part of an array
Off = No drive activity