Bug ID 15799738
When the solid state drive (SSD) is connected directly to the on-board SATA controller (ICH10), the SSD LED is ON when it is idle, and OFF when the SSD is busy (reading or writing). By design, the LED does not flash during SSD activity as is normal with HDDs.
Affected hardware:
Sun Fire X4170 M2 Server
Sun Fire X4270 M2 Server
Workaround:
This is expected behavior, and can be safely ignored.