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February 18th, 2021 09:00
R710 Membist failure after CPU Change
Hello,
i changed my CPUs from 2x E5620 to 2x L5640 in my old R710 Gen2.
Memory was untouched, i still have 18x 8GB installed in every slot.
After changing the CPU i got an Membist failure on DIMM-Slot A3, A6 and A9.
I tried swapping them with B3, B6 and B9 without success. Also i tried swapping the CPUs without success.
Now my R710 is running with only 120GB instead of 144GB as it was before changing the CPU.
What could i do to fix this? Im running the following software versions:
BIOS: 6.6.0
Firmware: 2.92 (Build05)
Lifecycle: 1.7.5.4
Thanks.
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Dell-DylanJ
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2.9K Posts
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February 18th, 2021 13:00
Hello,
I'd first reinstall the old processor, as you'd mentioned. Following that, I'd start some memory troubleshooting. Looking at the R710 user guide, slots 3, 6, and 9 share a memory channel in both A and B memory banks. Errors on one DIMM in a channel can sometimes make other DIMMs seem faulty, so I'd definitely look at testing them independently. For the volume of memory you have, I'd look at moving the DIMMs in 3, 6, and 9 and installing them in 1, 2, and 3. This way the DIMMs can be tested in separate channels. You can also test DIMMs by removing all memory and testing with only memory in A1 and there may still be value in that, but would also take much more time. This will hopefully isolate the error to a specific slot. Once you have a suspect slot, I'd swap that DIMM with any other DIMM in the machine to see what the error follows.
Let me know if this helps.
marcwa19197
2 Posts
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February 18th, 2021 15:00
i will try that.
Also i started the integrated memtest, which sees all 144gb memory and did not reported any fault.
Edit: to be clear, im now running with the new replaced CPUs. After i saw the membist issue i swapped CPU1 with CPU2.
I will try changing back to the original CPUs and check if the issue is there again.