Table 7. Expansion module LED states (continued)
CRU OK (Green) CRU Fault (Amber) SAS port activity
(Green)
Status
Blinking Expansion enclosure
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/EBOD expander module is powered on, the module has failed.
– Check that the IOM/EBOD expander module 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.
– Reseat the IOM/EBOD expander module in its slot.
– Check for logs pertaining to the failure.
• If the above actions do not resolve the fault, contact your supplier for assistance.
Temperature sensors
Temperature sensors throughout the enclosure and its components monitor the thermal health of the
storage system.
Exceeding the limits of critical values will cause a notication to occur.
Troubleshooting
The following sections describe common problems that can occur with your enclosure system, and some
possible solutions.
For the problems listed in Table 8 on page 58, the pertinent fault LEDs on the enclosure front panel will
light amber to indicate a fault and report to ESS software where appropriate. See also Overview of front
panel LEDs.
Table 8. Fault conditions
Status Severity
PSU alert -loss of DC power from a single PSU Fault - loss of redundancy
PSU fan fail Fault - loss of redundancy
CFF module detected PSU fault Fault
PSU removed Conguration error
Enclosure conguration error (VPD) Fault– critical
Low warning temperature alert Warning
High warning temperature alert Warning
Over temperature alarm Fault– critical
I
2
C bus failure Fault– loss of redundancy
Front panel communication error (I2C) Critical fault
58 IBM ESS expansion: Hardware Installation and Maintenance Guide - Model 106
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