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Two PSUs, double consumption. It's right?
I recovered an old PowerEdge 2900 server for a test lab. Although it's very old, its configuration allows me to simulate a production environment, which is what I need.
It has 2 XEON 5405, 8 x 300GB SAS HDDs (I have put 4 in RAID 5 and the others I am not using), 2 x 140GB SAS HDDs in RAID1.
It also has two PSUs, but in the list of components associated with my TAG there is only one "PWR SPLY, 930W, RDNT, EMERSON."
Perhaps both PSUs are associated with this code?
I plugged only one PSU under a 950W UPS, which was about half busy, which immediately overloaded.
I therefore connected the two PSUs to a power strip with a voltage meter.
With only one PSU connected, the value of about 140W is reported to me and then I don't understand how it is possible that with only 140W it could have overloaded the UPS.
If I then connect both PSUs, the value is about 300W and I understand this even less.
I thought that with two PSUs the server load was spread over both, not that the consumption would double.
DELL-Charles R
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August 2nd, 2021 08:00
Hello SommyJo,
The 2900 power supply subsystem consists of one or two AC-DC power supplies in a 1+1 redundant configuration connected directly to the planar. The base redundant system will utilize two hot-plug 930 W power supplies in a 1+1 configuration. The system may be purchased with a single power supply as a non-redundant configuration.
Example PSU Configuration: The Redundancy Mode depends on the server chassis and how many PSUs are installed. Here is an example of a server with dual power supply configuration.
PowerEdge PSU: How to troubleshoot a Server Power Supply Unit : https://dell.to/3C8rlqT
SommyJo
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August 2nd, 2021 10:00
Thanks for the answer and the explanation of how redundancy works.
But my problem remains.
Why do I measure a load with one PSU and double the load with two PSU if the server configuration remains the same with the same number of CPUs, memory and disks?
DELL-Charles R
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August 2nd, 2021 11:00
Hello SommyJo,
It may have a problem with one of the power supplies, the power distribution board, the system board, or third party parts.
Try using the each PSU by itself and test results, swap slots. Does the issue follow the PSU? If you are still connected to a UPS you may try direct to A/C outlet and test.
Make sure the system firmware, such as BIOS, BMC, backplane, hard drives, all hardware components are up to date.
Are the PSU identical? What is their DP/N (Dell part number)
Enter the BMC/DRAC configuration utility with + during POST and check System Event Log for any errors or faults.
Test in a minimum to POST configuration and add parts back a little at a time until you find faulting component
The minimum components to allow the PowerEdge™ 2900 to complete POST are:
System board
Processor (with heatsink) in socket 1
One stick of memory in slot 1
1 power supply
Power distribution board
Control panel (to turn on system)
SommyJo
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August 6th, 2021 09:00
The two PSUs are of the same model (7001049-Y000).
They are connected to a power strip (with voltage meter) connected to the A / C outlet.
The BIOS is 2.5.0.
I downloaded PE2900_BIOS_WIN_2.6.1.EXE, but I didn't understand how to install it. At this time the server does not have an operating system installed.
DELL-Charles R
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August 6th, 2021 10:00
Hello SommyJo,
You mentioned it is recovered. Can you let me know the history of the 2900?
Things like when it was last working, anything that was changed after that? Any additional information about the server you can provide.
What did you find in the BMC/DRAC configuration utility with + during POST and check System Event Log?
What results did you get with minimum to post configuration?
For this generation of server I'll recommend to use our SupportLive tool for troubleshooting.
Run Diagnostics and Updating firmware: Make a bootable image that includes the SLI tool
Version 2.x for PowerEdge 9G to 11G SLI 2.2 ISO Download - https://dell.to/3Cqu2o8
User guide: - https://dell.to/3jywDDG
Download Dell Server Update Utility, v.14.12.200.61 https://dell.to/3fWJnmT
Or you may choose to install an OS and run updates from the OS.
SommyJo
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August 7th, 2021 02:00
I bought it used for little money. I don't know his story.
It is for a test environment, not a production environment. If two power supplies cause me problems, I turn one off.
The System Event Log has been cleared, now there are only these two messages all repeating:
In fact the disk #6 is reported failure in the management of the RAID
I will try to install the BIOS with the links you pointed out to me.
For the moment, thank you