NEC S1300 User Manual page 29

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Figure 1-7. Front Chassis Features and Indicators (Bezel Removed)
1-16 Disk Array Unit Overview
This Manual:http://www.manuallib.com/nec/s1300ug-disk-array-unit-user-guide.html
Tray Ejector
POWER LED (green)
SERVICE LED (orange)
Disk module
HDD READY LED (green)
HDD FAULT LED
(orange)
The ejector is used to secure and remove the disk module
or dummy tray to the chassis.
The POWER LED lights green if the AC power is supplied
and the power switch is set to ON. The LED is off if the
power switch is set to OFF.
The SERVICE LED lights orange when the disk array unit
encounters an error. The LED flashes during the self-test
and initialization immediately after the power is turned on.
The LED goes off when the disk array unit has started, and
it is off while the disk array unit is operating normally.
The dedicated tray containing the HDD (hard disk drive).
The disk modules are installed in three slots from the left
and bound as RAID level 5 (shipping default). The remaining
twelve slots contain dummy trays.
The HDD READY LED lights green while the disk module
operates normally. The LED blinks when the disk module
transfers data.
The HDD READY LED blinks during the self-test or
initialization just after power-on.
The HDD FAULT LED lights at the occurrence of an error in
the disk drive. The LED is off while the disk drive operates
normally.