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BillyBob66
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R410 Memory Configuration question

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I have two Dell R410 Servers

8 x 4GB sticks (2Rx4)

8 x 8GB sticks (2Rx4)

I was hoping to put 2 sticks of 4GB and 2 sicks of 8GB per processor. for a total of 48GB per server.

As it was my understanding that these servers have 3 channels.

Ch 0 - 1&4 with 2 x 4GB sticks

Ch 1 - 8GB stick

Ch 2 - 8GB sitck

Should this work OK?

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RE: R410 Memory Configuration question

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2.) I tried looking all over the internet trying to figure out why channel 0 is better to put the larger?

It seemed to make sense to me to put the 2 x 4GB into channel zero, as that would bring to total RAM to chan 0 = 8GB, and then if I put 8GB in the others slots, that would make all "Channels" equal in size, or am I missing something?

I mixed up the guidelines with another familiar server. Refer to the diagram below:

The memory configuration of the R410 server is rather different from the rest. Processor 1 has 2 memory banks consisting of slots A1, A2 & A3 and the other bank is just slot A4. On the other hand, Processor 2 also has 2 memory banks consisting of slots B1, B2 & B3 and the other bank is just slot B4. For optimal memory configuration, memory in each of the banks has to be the same. We do not mix the memory sizes on these banks. Accordingly, you would have as observed Slots A1, A2 &A3 and B1, B2 &B3 = 4 GB and A4 &B4 =8 GB. In this case not necessarily "Channels" equal in size but banks equal in size. You are not missing a thing here! For more information,see pages 119 - 123 of the Users' Guide: ftp.dell.com/.../poweredge-r410_owner's manual_en-us.pdf

3.) I figured out that if I put, 4GB modules into slots 1,2,3 and 8GB into slot 4, and then reverse for the other server. I do NOT get the "unoptimized configuration" messages on boot. That also means I have one server with 40GB of RAM and another with 56GB of RAM which is very nonoptimal for my needs. 

What to do????

Unfortunately, you can't achieve 48 GB of optimal memory configuration with your current memory. For optimal 48 GB of memory you will need 6x 8 GB modules populated on slots A1, A2 &A3 and B1, B2 &B3 leaving slots A4 &B4 empty or unused.

Robert Alakara

Dell EMC | Enterprise Services

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RE: R410 Memory Configuration question

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Hello.

Have you actually booted the server with the above configuration?It may not be optimal configuration. You may also try populating Channel 0 slots A1 &A4 of processor 1 and slots B1 &B4 of processor 2 with 8 GB modules and the rest of the Channles 1 &2 with 4 GB modules.

Robert Alakara

Dell EMC | Enterprise Services

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BillyBob66
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RE: R410 Memory Configuration question

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Yes, I did. And it seems to work.  Accept for the unoptimized configuration message on every boot.

Thank you for your suggestion.  I will try it and let you know the result.

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RE: R410 Memory Configuration question

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For optimal memory configuration, populate slots A1 &A4 and B1 &B4 of Channel 0 of processors 1 &2 with the larger of the memory modules as indicated above.

Robert Alakara

Dell EMC | Enterprise Services

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BillyBob66
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RE: R410 Memory Configuration question

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First, thank you so much for the help. It's very much appreciated. However, I just need one last clarification. I hope.

1.) In both options, I will get the "unoptimized configuration" message on boot.

Is that OK?

2.) I tried looking all over the internet trying to figure out why channel 0 is better to put the larger?

It seemed to make sense to me to put the 2 x 4GB into channel zero, as that would bring to total RAM to chan 0 = 8GB, and then if I put 8GB in the others slots, that would make all "Channels" equal in size, or am I missing something?

3.) I figured out that if I put, 4GB modules into slots 1,2,3 and 8GB into slot 4, and then reverse for the other server. I do NOT get the "unoptimized configuration" messages on boot. That also means I have one server with 40GB of RAM and another with 56GB of RAM which is very nonoptimal for my needs. 

What to do????

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RE: R410 Memory Configuration question

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2.) I tried looking all over the internet trying to figure out why channel 0 is better to put the larger?

It seemed to make sense to me to put the 2 x 4GB into channel zero, as that would bring to total RAM to chan 0 = 8GB, and then if I put 8GB in the others slots, that would make all "Channels" equal in size, or am I missing something?

I mixed up the guidelines with another familiar server. Refer to the diagram below:

The memory configuration of the R410 server is rather different from the rest. Processor 1 has 2 memory banks consisting of slots A1, A2 & A3 and the other bank is just slot A4. On the other hand, Processor 2 also has 2 memory banks consisting of slots B1, B2 & B3 and the other bank is just slot B4. For optimal memory configuration, memory in each of the banks has to be the same. We do not mix the memory sizes on these banks. Accordingly, you would have as observed Slots A1, A2 &A3 and B1, B2 &B3 = 4 GB and A4 &B4 =8 GB. In this case not necessarily "Channels" equal in size but banks equal in size. You are not missing a thing here! For more information,see pages 119 - 123 of the Users' Guide: ftp.dell.com/.../poweredge-r410_owner's manual_en-us.pdf

3.) I figured out that if I put, 4GB modules into slots 1,2,3 and 8GB into slot 4, and then reverse for the other server. I do NOT get the "unoptimized configuration" messages on boot. That also means I have one server with 40GB of RAM and another with 56GB of RAM which is very nonoptimal for my needs. 

What to do????

Unfortunately, you can't achieve 48 GB of optimal memory configuration with your current memory. For optimal 48 GB of memory you will need 6x 8 GB modules populated on slots A1, A2 &A3 and B1, B2 &B3 leaving slots A4 &B4 empty or unused.

Robert Alakara

Dell EMC | Enterprise Services

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BillyBob66
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RE: R410 Memory Configuration question

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Now I fully understand. I may be able to swap memory with some other servers I have and make it all work as I would like.

Just one last thing.  Now that I think I fully understand.

The picture you have above, is a little bit confusing to me personally.

Should it not be more like this?

Thank you! again for the help.