DL380 Gen9 RAM Upgrade Issues

[LeeRH]

Hi folks

Like others, I am having problems upgrading my DL380's RAM.  I know there's documentation out there, but if I'm honest, I just don't understand it enough to solve my problem.

Currently I have 4 x 8GB dimms (1RX4 PC4-2133P-RC0-10)  in all the white slots for both processors, and then 2 x 8GB dimms in the E+F black slots, giving us a total of 96GB over 12 dimms.

I have now bought 2 x 32GB dimms (728629-B21 - HPE 32GB (1x32GB) Dual Rank x4 DDR4-2133).  I have tried adding these two dimms in the blue slot #10 on each processor, in blue slot #7 and black slot #2, but all give me misconfiguration errors.

Any ideas on where / if I can fit these dimms?

Thanks so much in advance,

Lee

[support_s]

System recommended content:

1. Advisory: ProLiant Gen9 Series Servers - SYSTEM ROM UPGRADE RECOMMENDED: Systems Configured with an HP 32GB 2Rx4 PC4-2133P-R Kit Should Upgrade the System ROM if a "295" POST Error Is Encountered

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[msobers22]

Hello,

The Letters identify the population order. You must follow the population order when placing the DIMMs. 

• White DIMM slots denote the first slot of a channel. For 1 DPC (DIMM per channel) populate white slots only.
• A minimum of one DIMM is required per server.
• Install DIMMs only if the corresponding processor is installed.
• If only one processor is installed in a two processor system, only half of the DIMM slots are available.
• To maximize performance, it is recommended to balance the total memory capacity between all installed processors and to load the channels similarly whenever possible.
• When two processors are installed, balance the DIMMs across the two processors.
• Populate DIMMs from heaviest load (quad-rank) to lightest load (single-rank) within a channel.Heaviest load (DIMM with most ranks) within a channel goes furthest from the processor.

Document - HPE ProLiant DL380 Gen9 Server - Configuring Memory | HPE Support

Document - ProLiant DL380 Gen9 Server User Guide | HPE Support

Hopefully this helps

[Cali]

Populate in Alphabetical Order, (Black G & H).

And put the new Dual Rank in the first Slot A & B.

Cali

[LeeRH]

Hi Cali

Sorry, I don't understand your reply..  The existing DIMMS have been added across the two processors in alphabetical order:

A (white /ch1) = 8gb
B (white /ch2) = 8gb
C (white /ch3) = 8gb
D (white /ch4) = 8gb

Plus:
E (black /ch1) = 8gb
F (black /ch2) = 8gb

So at this point, I have more than 1 dimm per channel (white+black).

So are you saying I should leave the above in place but add the 32gb dimm to G on both processors?  I think I tried this but it got rejected.  I should say again that I only have two 32gb dimms, so could not populate G & H on both CPUs unless I purchased more RAM or only added to one CPU.

Thanks for your help,

Lee

[Cali · Accepted solution]

OK, now it's a bit clearer.

• You have to populate in Alphabetical Order.

So the next free is G

• Populate DIMMs from heaviest load (quad-rank) to lightest load (single-rank) within a channel. Heaviest load (DIMM with most ranks) within a channel goes furthest from the processor.

For me, this means, that the new 32GB Dual Rank, has to be in Slot A, B, or C.
So, I would swap C with G.

[LeeRH]

Ah, ok, now I think I understand.  Sometimes it takes a bit of time and explanation to understand the manual!  I will do what you suggest, re-ordering the third channel to weight it differently and see if that helps.  Unfortunately this is our main hypervisor machine so can't try until late on Friday.

Cheers Cali

Lee

[LeeRH]

Thanks again, Cali, this totally worked and all ram is available now. 

[Sunitha_Mod]

Hello @LeeRH, 

Excellent! 

We are glad to know the problem has been resolved.