Disk drive enclosure LED positions and definitions.
The
7031-D24 and
7031-T24 use a series of green and
amber LEDs. The Light Emitting Diodes (LED)s are located on the front and
the back of the disk-drive enclosure and are used to indicate disk drive enclosure
and component activity, fault, and power status. 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 interface 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 iSeries 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 interface card LEDs
- Each SCSI interface card has a green and amber colored LED. The green
colored LED indicates that activity is taking place through the interface
card. The amber colored LED is used as an identify LED and indicates which
one of the SCSI interface cards needs to be replaced.
The following two figures show the location of each LEDs found on the 7031-D24 or 7031-T24.
Figure 1. Front view showing
maintenance LEDs on the 7031-D24 and 7031-T24
| 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 iSeries models only) |
| 5 |
Status panel cage fault LED |
|
|
Figure 2. Rear view showing
maintenance LEDs on the 7031-D24 and 7031-T24
| 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 interface card fault LED |
12 |
Power supply 2 |
| 5 |
SCSI interface card activity LED |
13 |
Power supply 1 |
| 6 |
Dual initiator SCSI interface card |
14 |
Rack indicator connector |
| 7 |
Single initiator SCSI interface card |
15 |
Disk drive identify LED (activated
on iSeries models only) |
| 8 |
Power supply fault LED |
|
|
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