PE T430 - Power Input Detection Issues

Question

We have a T430 with Dual 495w PSUs with each PSU connected to an independent UPS. PSU1 is connected to UPS1. PSU2 is connected to UPS2. Whenever there is a power blip/fluctuation, PSU2 claims to have lost input power and as expected reports... Power supply redundancy is lost. Message ID: RDU0012 The power input for power supply 2 is lost. Message ID: PSU0003 Front panel led, OMSA, IDRAC all reflect the same power loss to PSU2, however, the PSU lights remain green throughout like they never lost input power at all. And if I remove power to PSU1, PSU2 takes the full load without issue. So, obviously this is a false alarm and the system is in a power redundant state despite the alert. Or the power is restored almost instantaneously but the system doesnt detect that input power to PSU2 has been restored. It seems like the power fluctuation causes the system to believe PSU2 is not getting power input when in fact it is. If I manually remove power to PSU2, no further alerts are generated. I have to either completely turn-off and turn-on the system, or remove and re-seat the PSU2 for the system to detect that it has regained PSU redundancy. Any idea what might be causing this and possible solutions? All firmware is updated to the latest versions. The UPS2 is not faulty as we have another server connected in a similar configuration and that system does not lose power to either of its PSUs. Server1 (T430) : PSU1 (495w) - UPS1 (2kv) - no power issues detected Server2 (T420) : PSU1 (495w) - UPS1 (2kv) - no power issues detected Server1 (T430) : PSU2 (495w) - UPS2 (2kv) - input power lost Server2 (T420) : PSU2 (495w) - UPS2 (2kv) - no power issues detected

FahdK · Answer

Both PSUs and UPS connections are firm and secure. The voltage reading seems more promising, PSU1 is a steady 220V, and PSU2 seems to vary output between 230V and 240V. UPS1 is an online double conversion unit, and UPS2 is a line-interactive unit. If this is the cause of the problem, then its very odd that only Server1 (newer T430) is affected, while Server2 (older T420) is not.

Clearing the log did NOT bring PSU2 status back online. If that was the expected result.

Individual Power Supply Elements

Health	Name	Status	Input Wattage	Output Wattage	FW Version	Part Number	Type


	PS1 Status	Present	594	495	00.1B.7A	0GRTNKA00	AC
	PS2 Status	Present \| Input lost \| Input lost or out-of-range	594	495	00.1B.7A	0GRTNKA00	AC

FahdK · Answer

That may well be the case and cause of the power blip. And even if that is the case, the problem here is that the system does not detect that power input has been restored to normal operating range. Is that a bug?

What is preventing the system (idrac/omsa) from detecting that power input has been restored to normal operating range? And how can I fix that? Sounds like a firmware update is needed? Or for some reason idrac/omsa is not getting the message from the PSU. PSU is green light all the way.

PowerEdge Hardware General

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