IBM Midrange System DS4000 Series Hardware Manual page 98

Power LED (green)
– On: The subsystem is powered on.
– Off: The subsystem is powered off.
RAID controller LEDs
There are LEDs on the RAID controllers that serve as indicators of key information (refer to
Figure 3-58, Table 3-5, and Table 3-6 for LED status details).
Figure 3-58 DS5020 RAID controller LEDs
Host SFP LEDs
LED #0 (green): Host channel speed L1
LED #1 (green): Host channel speed L2
Table 3-5 FC host SFP status LED definitions
LED#0
OFF
ON
OFF
ON
Disk Channel SFPs LEDs
Table 3-6 FC disk expansion port SFP LED definitions
LED#0
OFF
ON
OFF
ON
80
IBM Midrange System Storage Hardware Guide
EXP 0 SFP
Bypass
Host 1 SFP Host 2 SFP
LED0 LED1 LED0 LED1
HOST BOARD
PORTS
Gb ETH 0
Encoded Rate LEDs
LED0 LED1
EXP 1 SFP
Bypass
Gb ETH 1
Link rate
Activity
LED#1
OFF
OFF
ON
ON
LED#1
OFF
OFF
ON
ON
Ready to remove (blue)
Fault (amber)
Cache active (green)
Seven segment display
BBU
CRU
Debug
port
Port status
Link down
Link rate 2 Gbps
Link rate 4 Gbps
Link rate 8 Gbps
Port status
Link down
Reserved
Link rate 2 Gbps
Link rate 4 Gbps