LEDs

LED colors are used consistently throughout the enclosure and its components to indicate status

Green: Good or positive indication
Flashing green or amber: Non-critical condition
Amber: Fault

Note: When the enclosure is powered on, all LEDs light up for a short period to ensure that they are working. This condition does not indicate a fault unless the LEDs remain lit after a few seconds.

PSU LEDs

Figure 1. PSU LEDs

Table 1. PSU LED states
PSU Fail (Amber)	AC Missing (Amber)	Power (Green)	Status
Off	Off	Off	No AC power to either PSU.
On	On	Off	PSU present, but not supplying power or PSU alert state (usually due to critical temperature).
Off	Off	On	Main AC present, switch on. This PSU is providing power.
Off	Off	Flashing	AC power present, PSU in standby (other PSU is providing power).
Flashing	Flashing	Off	PSU firmware download
Off	On	Off	AC power missing, PSU in standby (other PSU is providing power).
On	On	On	Enclosure management software has lost communication with the PSU.
On	-	Off	PSU has failed. Follow the procedure in "Replacing a Power Supply Unit (PSU)."

Cooling module LEDs

Figure 2. Cooling module LEDs

Table 2. Cooling module LED descriptions
LED	Description
Module OK	Constant green indicates that the fan is working correctly. Off means the fan has failed. Follow the procedure in "Replacing a Cooling Module."
Battery Fault	Not currently used.
Fan Fault	Amber indicates that a fan has failed. Follow the procedure in "Replacing a Cooling Module."

Operator’s panel LEDs

The operator’s (ops) panel displays the aggregated status of all the modules, as shown in the following figure.

Figure 3. Operator’s panel LEDs

Table 3. Ops panel LED descriptions
Display/LED	Description
Unit Identification Display	Usually shows the identification number for the enclosure, but can be used for other purposes.
Power On/Standby LED	Amber if the system is in standby. Green if the system has full power.
Module Fault LED	Amber indicates a fault in a PSU, cooling module or SBB I/O module. Check the drawer LEDs to see if a drive fault is indicated (see Drawer LEDs)
Logical Status LED	Amber indicates a fault from something other than enclosure management usually a disk (drive fault, or Spectrum scale RAID). Check the drawer LEDs to see if a drive fault is indicated (see Drawer LEDs).
Drawer 1 Fault LED	Amber if there is a drive, cable, or sideplane fault in drawer 1. Open the drawer and check the disk drive LEDs for faults.
Drawer 2 Fault LED	Amber if there is a drive, cable, or sideplane fault in drawer 2. Open the drawer and check the disk drive LEDs for faults.

Drawer LEDs

The following figure shows the names and locations of the disk drawer LEDs.

Figure 4. Drawer LEDs (left sideplane only)

Table 4. Drawer LED descriptions
LED	Description
Sideplane OK/Power Good	Green if the sideplane card is working and there are no power problems.
Drawer Fault	Amber if a drawer component has failed. If it is a drive that has failed, an amber LED lights up on the failed drive; follow the procedure in "Replacing a Disk Drive in Carrier (DDIC)." If the drives are functioning correctly, contact your storage vendor to identify the failure.
Logical Fault	Amber if there is a drive fault.
Cable Fault	Amber if the cabling between the drawer and the back of the enclosure has failed. Contact support to resolve the problem.
Activity Bar Graph	Shows the amount of data I/O from zero segments lit (no I/O) to all six segments lit (maximum I/O).

Disk drive in carrier (DDIC) LED

Each disk drive has a single amber drive fault LED as shown in the following figure. When lit, service action is required for the drive. See Elastic Storage Server Spectrum Scale RAID Administration Guide for servicing and replacing the drive. Do not remove or replace a drive without following the proper procedure stated in Elastic Storage Server Spectrum Scale RAID Administration Guide.

Figure 5. Drive Fault LED

SBB I/O Module LEDs

The following figure shows the LEDs on the 6 Gb/s SAS EBOD SBB I/O module.

The LEDs on the SBB I/O module depend on the type of module in use. The following figure shows the LEDs for a common I/O module, the 6 Gb/s SAS EBOD.

Figure 6. SBB I/O module LEDs

Table 5. 6Gb/s SAS EBOD I/O Module LED Descriptions
LED	Description
I/O Module OK	Constant green if the I/O module is operating correctly. Flashing green indicates an I/O module VPD error.
I/O Module Fault	Constant amber if the I/O module is faulty. For replacement procedure see Replacing an SBB I/O module.
External Host Port Activity	Constant green indicates that there is a host port connection but no activity. Flashing green indicates that there is a host port connection, and data is being transferred.