Howto properly replace memory R910

Question

Hello, We have a Poweredge R910 with 128GB ram (32x4GB) Recently a dimm failed (E3 and E4), this resulted in only 96GB available mem (complete riser is disabled).We purchased spareparts via Dell and installed the new dimms for E3 and E4.After the installation, the system only shows 96GB and still gives the warning: Memory Initialization Warning: Memory size and/or performance may be reduced.Memory Riser E disabled - DDR training error. DDR training error: Memory Riser E DIMM 4Memory Riser E Lockstep Pair DIMM 3 & DIMM 4 disabled,Please replace the DIMM or remove the lockstep pair. This is the same warning before the replacement.After booting into the System menu (F10), i ran a memtest. This failed with a error like: There is still a warning in the eventlog, clear the eventlog. After clearing the event log, the system menu shows someting like: E3 & E4 replaced. And i'm able to run the memtest. I rebooted the system, but it still only shows 96GB and gives the same Memory Initialization Warning as described above. I think the memory is good and the error needs to be cleared/riser needs to be enabled. But how do i do this? Or am i missing something?   Thanks in advance!

qentijn · Answer

Hi Chris,

Thanks for your quick reply!

First we enabled the Inventory collection, not sure if this worked.

We powered the system off, pressed the 'on' button for 20 seconds, swapped the 2 DIMM's and riser E and C. (thus E3 and E4 is now C7 and C8)
Powered the machine on and we see 128GB of RAM.

Too bad, after 15 minutes the server crashes on C3 and C4, so it seems the riser is defective.

Should i just order a new riser or is there any way to solve this?

Thanks in advance!

ps. I marked this as 'Solved' and instantly the server crashes... However the replacement worked as you described.

PowerEdge Hardware General

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