This topic provides detailed information on the use of
component and attention LEDs.
The component and attention LEDs assist in identifying failing
components in your I/O enclosure. If a failing component is detected
in your enclosure, an amber colored LED on or near the failing component
is lit. Use the information in this topic along with the "Start of
call" procedure, located in your host system's service information, to isolate
the failing component.
LEDs are either green or amber. The LEDS are typically located
on the component.
Green LEDs indicate either of the following:
- Electrical power is present.
- Activity is occurring on a link. (The enclosure is either sending
or receiving information.)
Amber LEDs indicate a fault or identify condition. If your enclosure
or any of its components in your enclosure has an amber LED turned
on or blinking, identify the problem and then take the appropriate
action to restore the enclosure to its normal operating state.
The following definition list identifies, defines, and explains
the on and off state of each LED. Following the definition list are
two illustrations that show the location of each LED.
- Disk drive enclosure status LEDs
- The two disk drive enclosure status LEDs indicate the following:
- Power good LED - (solid, not blinking) when lit this green colored
LED indicates that the disk-drive enclosure is receiving dc electrical
power.
- Cage Fault LED - (solid, not blinking) when lit this amber colored
LED indicates that one of the components located in the disk-drive
enclosure has failed.
Note: - The failing component can be located either on the front or the
rear of the subsystem.
- The disk-drive enclosure might be able to continue operating satisfactorily
although the failure of a particular part has been detected.
- Disk drive LEDs
- Up to twenty four disk drives can be installed into the front
and back of the disk-drive enclosure (twelve disk drives per side).
Each disk drive contains three LEDs that are visible via light pipes.
The light pipes are attached to the disk-drive carrier and extend
out the left side of each disk drive.
- Disk drive activity LED (green) - The disk drive activity LED
is controlled by the disk. For most disk drives the green LED is lit
when the disk is processing a command. However, for some disk drives
a different mode page setting allows the green LED to be lit when
the disk drive motor is spinning and the LED blinks toward an off
state when a command is in progress.
- Disk drive fault LED (amber) - The disk fault LED is controlled
by the SES processor on the SCSI card. The disk drive fault LED can
be viewed in one of the following three states:
- Off - This is the normal state for the disk-drive fault LED
- On - (solid, not blinking) indicates one of the following:
- A drive is to be removed
- The disk drive is faulty
- Appears on an empty slot where a drive is to be installed
- Blinking - The disk drive is rebuilding
- Disk drive identify (green) - The light pipe for this LED is located
on the lower left side of the disk drive and is used for the identify
function by disk-drive enclosures that are connected to an IBM® System i® systems.
- Power supply LEDS
- This disk drive enclosure contains two power supplies and they
are located on the back lower third portion of the chassis. The power
supply located on the left of the chassis is power supply 1. The power
supply located on the right side of the chassis is power supply 2.
Each power supply contains four LEDs located on the lower right side.
The following list identifies and defines each of the power supply
LEDs.
- Cage fault LED - This is an amber colored LED and is labeled C/F.
The power supply cage fault LED provides the same information as the
cage fault indicator located on the front of the enclosure.
- AC good LED - This a green colored LED and is labeled I/G
- DC power good LED - This green colored LED is labeled D/G. Indicates
that the enclosure is getting good dc power. It is on when +1.8 V,
+3.3 V, +5 V, and +12 V are good. It goes off when any of the mentioned
voltages are not good.
- Power supply fault LED - This amber colored LED is labeled FLT
and comes on solid when there is a fault with the power supply.
The following table explains the fault condition or power
supply state indicated by each power supply LED:
Table 1. Power
supply fault condition| LED name |
Normal operation state |
Input not present state |
Input present state |
Fault state |
|---|
| Cage fault LED |
OFF |
OFF |
ON |
|
| AC good LED |
ON |
OFF |
ON |
ON |
| DC power good LED |
ON |
OFF |
OFF |
OFF |
| Power supply fault LED |
OFF |
OFF |
ON |
OFF |
- Fan assembly LEDs
- The three disk-drive enclosure fan assemblies are located on the
front lower third of the enclosure chassis. There are two LEDs located
on each fan. The green colored LED is lit when power to the fan is
present. The second LED is amber colored when lit and comes on when
the fan needs to be replaced.
Note: - The fan does not need to be completely dead before the fan fault
LED is lit. The fan can be turning either to slow or to fast indicating
to the system that it is having a problem.
- The fans green LED will remain lit even when the amber LED is
indicating a fan fault.
- SCSI card LEDs
- Each SCSI card has a green and amber colored LED. The green colored
LED indicates that activity is taking place through the card. The
amber colored LED is used as an identify LED and indicates which one
of the SCSI cards needs to be replaced.
The following two figures show the location of each LEDs found
on your I/O enclosure.
Figure 1. I/O enclosure front
view showing maintenance LEDs
| Index Number |
Component LED |
Index Number |
Component LED |
|---|
| 1 |
7031-D24 or 7031-T24 |
6 |
Fan power LED |
| 2 |
Disk drive activity LED |
7 |
Fan fault LED |
| 3 |
Disk drive fault LED |
8 |
Fan assembly |
| 4 |
Status panel power good LED |
9 |
Disk drive identify LED (activated
on System i models only) |
| 5 |
Status panel cage fault LED |
|
|
Figure 2. I/O enclosure rear
view showing maintenance LEDs
| Index Number |
Component LED |
Index Number |
Component LED |
|---|
| 1 |
7031-D24 or 7031-T24 |
9 |
Power supply dc power good LED |
| 2 |
Disk drive activity LED |
10 |
Power supply ac power good LED |
| 3 |
Disk drive fault LED |
11 |
Cage fault LED |
| 4 |
SCSI card fault LED |
12 |
Power supply 2 |
| 5 |
SCSI card activity LED |
13 |
Power supply 1 |
| 6 |
Dual initiator SCSI card |
14 |
Rack indicator connector |
| 7 |
Single initiator SCSI card |
15 |
Disk drive identify LED (activated
on System i models only) |
| 8 |
Power supply fault LED |
|
|
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