LEDs

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Overview

LED colors are used consistently throughout the enclosure and its components for indicating status:
Green
Good or positive indication
Blinking green/amber
Non-critical condition
Amber
Critical fault

PSU LEDs

Under normal conditions, the bi-tonal PSU Status OK LED will be a constant green. See also Figure 1. When a fault occurs, the color of the LEDs will display as shown in the following table.

Table 1. 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 the front panel are labeled in Figure 1 and they are individually described in the narrative 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 1. Drive carrier module LED
Drive LED
Table 2. 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

IOM LEDs

Expansion IOM status is monitored by the LEDs located on the face plate. See also Figure 4. LED behaviors for expansion enclosures are described in the table below.

Table 3. Expansion module LED states
CRU OK (green) CRU Fault (amber) SAS port activity (green) Status
On Off   Expansion module OK
Off On   Expansion module fault – see the Replacing an IOM section.
    Off No external port connection
    On HD mini-SAS port connection – no activity
    Blinking HD mini-SAS port connection – activity
Blinking     IOM VPD error
Actions:
  • If the Power OK LED is blinking, wait for the system to boot.
  • If the Power OK LED is off, and the IOM is powered on, the module has failed.
    • Check that the IOM is fully inserted and latched in place, and that the enclosure is powered on.
    • Check for logs pertaining to the failure
  • If the Fault LED is on, a fault condition is detected
    • Re-seat the IOM in its slot.
    • Check for logs pertaining to the failure
  • If the above actions do not resolve the fault, contact IBM support for assistance.