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Chapter 1 Before You Begin 17
Figure 1-3 shows the LEDs at the back of the controller.
Figure 1-3 Controller LEDs (Back View)
Table 1-5 describes the LEDs on the back of the controller
Table 1-5 Controller LEDs (Back)
Location LED Color State Description
Power and
cooling
module
AC Power Good Green Off AC power is off or input voltage is below the
minimum threshold.
On AC power is on and input voltage is normal.
Power and
cooling
module
DC Voltage/
Fan Fault/
Service Required
Amber Off DC output voltage is normal.
On DC output voltage is out of range or a fan is
operating below the minimum required RPM.
Controller
module
Host link status Green Off The port is empty or the link is down.
On The port link is up and connected.
Controller
module
Host link activity Green Off The host port is not connected or the link is down.
On The host link is up and active.
10/100 BASE-T
STATUS
ACTIVITY
DIRTY
CLEAN
CACHE
CLI
Service
LINK ACT
iSCSI
Port 0
iSCSI
Port 1
LINK ACT
10/100 BASE-T
STATUS
ACTIVITY
DIRTY
CLEAN
CACHE
CLI
Service
LINK ACT
iSCSI
Port 0
iSCSI
Port 1
LINK ACT
AC Power Good
Service Required
DC Voltage/Fan Fault/
Host link status
Host link activity
Unit Locator
OK to Remove
Fault/Service Required
OK
Cache status
Host activity
Expansion port status
Ethernet activity
Ethernet link status