IBM Midrange System DS4000 Series Hardware Manual page 68

The LEDs are:
LED #1 and LED #2. See Table 3-2 on page 51.
LED #3 (amber): Drive port bypass:
– Off: Normal status.
– On: Drive port bypass problem.
LED #4 (green): Drive channel speed L1:
– Speed L1. See Table 3-2 on page 51.
LED #5 (green): Drive channel speed L2:
– Speed L2. See Table 3-2 on page 51.
LED #6 (amber): Drive port bypass:
– Off: Normal status.
– On: Drive port bypass problem.
LED #7 (blue): Service action allowed:
– Off: Normal status.
– On: Safe to remove.
LED #8 (amber): Needs attention:
– Off: Normal status.
– On: Controller needs attention (controller fault or controller is offline).
LED #9 (green): Cache active:
– On: Data in cache.
– Off: No data in cache.
LED #10 (green): Ethernet link speed:
– Off: 100BASE-T or 10BASE-T.
– On: 1000BASE-T.
LED #11 (green): Ethernet link activity:
– Off: No link established.
– On: Link established.
– Blinking: Activity.
LED #12 (green/yellow): Numeric display (enclosure id/diagnostic display):
– Diagnostic LED: On = Diagnostic code is displayed.
– Diagnostic LED: Flashing = Controller enclosure ID is displayed.
See "Numeric display LEDs" on page 51 for more information.
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IBM Midrange System Storage Hardware Guide