NOTE for future ASRock LGA3647 + Optane DCPMM / PMEM users...

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NablaSquaredG

Layer 1 Magician
Aug 17, 2020
1,337
810
113
Hey folks,

Today I deployed a flash-only server with an EPC621D8A and Optane DCPMM / PMEM As SLOG...

And I spent a solid hour troubleshooting, because once I installed the Optane DIMMs, the entire memory channel (including the regular RDIMM) was not recognised anymore.
I swapped RAM, DCPMMs and CPUs with no success.

Thanks to a hint from @RolloZ170 I realised that in opposite to other boards, ASRock boards have jumpers that need to be set in order for Optane to work!

In the manual they're simply labeled as "NVDIMM support" with no other hint about them anywhere in the manual...

So, if you're deploying an ASRock board with Optane and it doesn't work: Check your jumpers!
 
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technovelist

New Member
Dec 26, 2021
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NablaSquaredG said:
Hey folks,

Today I deployed a flash-only server with an EPC621D8A and Optane DCPMM / PMEM As SLOG...

And I spent a solid hour troubleshooting, because once I installed the Optane DIMMs, the entire memory channel (including the regular RDIMM) was not recognised anymore.
I swapped RAM, DCPMMs and CPUs with no success.

Thanks to a hint from @RolloZ170 I realised that in opposite to other boards, ASRock boards have jumpers that need to be set in order for Optane to work!

In the manual they're simply labeled as "NVDIMM support" with no other hint about them anywhere in the manual...

So, if you're deploying an ASRock board with Optane and it doesn't work: Check your jumpers!
Click to expand...
Did you set up the Optane in memory mode or AppDirect?
 
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