page 17. When a fault occurs, the color of the LEDs will display as shown in the following table.
Table 16. PSU LED status
PSU status (green)
PSU status (amber)
Status
Off
Off
No AC power on this PSU only
On
Off
AC present; PSU working
correctly
Off
On
PSU fault (over temperature, over
voltage, over current)
Off
Blinking
PSU firmware download is in
progress
Front panel LEDs
The front panel displays the aggregated status of all the modules. The enclosure status LEDs located on
subsections that follow the table.
Disk drive carrier module LED
Disk drive status is monitored by an amber LED mounted on the front of each drive carrier module, as
shown in the figure below. The drive module LED conditions are defined in the table following the figure
below.
In normal operation the amber LED will be:
• Off if there is no drive present.
• Off as the drive operates.
• On if there is a drive fault.
Figure 26. Drive carrier module LED
Table 17. Drive carrier module LED
State (Amber)
Status
Off
Enclosure is not powered on.
Off
Disk drive module is installed and operational
Blinking: 1s on/1s off
SES device identity set
On
SES device fault bit set
On
Power control circuit failure
48 IBM Cloud Object Storage System: Medium/Large J11/J12 Disk Enclosure Hardware Installation and
Maintenance Manual
Summary of Contents for 4957-J11
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