It sounds like you've already ruled out memory as a possibility, since you've tried multiple DIMMs. The only additional memory troubleshooting step you might consider is taking the memory from that channel and distributing it in such a way that those DIMMs are now all in different channels. DIMM errors can sometimes cause a channel to shut down, so this may help confirm DIMM health. The memory controller is on the processor, so unless you have two processors with the same issue, I'd be inclined to suspect that you may have a board issue.
With this being a replacement board though, I'd double check that the BIOS and iDRAC firmware are up to date. There's no guarantee that the board was updated before you received it and memory fixes are fairly common with updates.
As a point of clarification, does the host OS see the full amount of memory, or does it see the same amount of memory as shown in the hardware inventory?
I tried resettign the default, did the jumpers and removed/repalced the CMOS battery, essentially all the same thing. This obviously reset the settings not the bios its self, so all drivers and Bios remained the latest. No change to RAM issue.
Dell-DylanJ
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2.9K Posts
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March 12th, 2021 08:00
Hello,
It sounds like you've already ruled out memory as a possibility, since you've tried multiple DIMMs. The only additional memory troubleshooting step you might consider is taking the memory from that channel and distributing it in such a way that those DIMMs are now all in different channels. DIMM errors can sometimes cause a channel to shut down, so this may help confirm DIMM health. The memory controller is on the processor, so unless you have two processors with the same issue, I'd be inclined to suspect that you may have a board issue.
With this being a replacement board though, I'd double check that the BIOS and iDRAC firmware are up to date. There's no guarantee that the board was updated before you received it and memory fixes are fairly common with updates.
As a point of clarification, does the host OS see the full amount of memory, or does it see the same amount of memory as shown in the hardware inventory?
Jtg246
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September 4th, 2023 23:21
Hi,
Thanks for the response.
apologies when you say take it all from one channel and distribute it, could you clarify the layout?
If I assumed A2, B2 where faulty, can I skip that channel and just populate the remaining in order?
I do have 2 processors installed, and its saying both A2 and B2 are empty when they are not.
Thanks
Jtg246
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September 4th, 2023 23:22
Oh and I'm runnign proxmox and its saying the same info as the Bios.
WANGSHUNFA11
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September 5th, 2023 00:48
1. need a down time around 2 hours
2. load factory default of bios
3. update bios and then idrac firmware one by one , then verify memory info. again.
Support for PowerEdge R720 | Drivers & Downloads | Dell US
Jtg246
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September 5th, 2023 11:18
@WANGSHUNFA11
@WANGSHUNFA11 Thank you for your response
How do I load factory default of bios?
I tried resettign the default, did the jumpers and removed/repalced the CMOS battery, essentially all the same thing. This obviously reset the settings not the bios its self, so all drivers and Bios remained the latest. No change to RAM issue.
I can find a factory BIOS online to restore too.
Thanks
Jtg246
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September 15th, 2023 09:44
@DELL-Marco B
I have reset the BIOS, but it has made no difference to the issue.
Any other ideas?
Kind regards
James