Oracle X5-4 Service Manual page 55

Troubleshooting Hardware Faults Using Oracle ILOM
acceptable range. You can verify proper connection and operation of a power supply by
checking its indicator panel.
A properly installed PSU has its green AC OK indicator lit. A properly functioning PSU has its
green power (DC) OK indicator lit and its amber Service Action Required indicator off.
Prevention: Use the AC power cord retaining clips and position the cords to minimize the risk
of accidental disconnection. Ensure that the AC circuits that supply power to the server are
stable and not overburdened.
Power Supplies (PSUs)
The server power supplies (PSUs) provide the necessary server voltages from the AC power
outlets. If the PSUs are inoperable, unplugged, or disengaged from the internal connectors, the
server cannot power on.
Action: Check that the AC cables are connected to both PSUs and that the PSUs are operational
(the PSU indicator panel should have a lit green AC OK indicator). If not, ensure that the PSU
is properly installed. A PSU that is not fully engaged with its internal connector does not have
power applied and does not have a lit green AC OK indicator.
Prevention: When a power supply fails, replace it immediately. To ensure redundancy, the
server has two PSUs. This redundant configuration prevents server downtime, or an unexpected
shutdown, due to a failed PSU. The redundancy allows the server to continue to operate if one
of the PSUs fails. However, when a server is being powered by a single PSU, the redundancy
no longer exists, and the risk for downtime or an unexpected shutdown increases. When
Troubleshooting and Diagnostics 55