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PowerEdge R805: Failed to configure Memory Sparing

Dell PowerEdge R805, is one of the AMD-based server from Dell. However, not much customer own one, and this may due to its supported platform quite different if compared with Intel-based server. Few days ago, one India customer called, and throw a lots of question to me before I can response to him:

"..I checked your documentation, found that this server should support Memory Sparing, but I just can't find the option from BIOS.."
Customer even share with me on how he tried to configure/modify the BIOS option, but end with FAIL.I checked his server specification, and I got the answer:
Server doesn't fully populated with Memory.
In summary, if you wish to configure Memory Sparing in this model, you should ensure:

  • System is populated with full Memory module
  • F2 System BIOS -> Memory Information -> Node Interleaving -> Disabled
  • DIMMs must be paired as spares also

Please refers to the table below for more info:

Processor 1

Processor 2

Available
Memory

Spared
Memory
DIMMA1
DIMMA2
DIMMA3
DIMMA4
DIMMB1
DIMM B2
DIMMB3
DIMMB4

1 CPU /
2 CPUs

1 CPU /
2 CPUs
512
MB
512
MB
512
MB
512
MB
512
MB
512
MB
512
MB
512
MB
1 GB /
2 GB
1 GB /
2 GB
1 GB1 GB1 GB1 GB1 GB1 GB1 GB1 GB2 GB /
4 GB
2 GB /
4 GB
2 GB2 GB2 GB2 GB1 GB1 GB1 GB1 GB4 GB /
8 GB
2 GB /
4 GB
2 GB2 GB2 GB2 GB2 GB2 GB2 GB2 GB4 GB /
8 GB
2 GB /
4 GB
4 GB4 GB4 GB4 GB4 GB4 GB4 GB4 GB8 GB /
16 GB
4 GB /
8 GB
Indicates a spared single-rank DIMM (512-MB, 1-GB, or 2-GB). The entire capacity of this DIMM is reserved for sparing.
Indicates a spared dual-rank DIMM (2-GB and higher). One-half of this DIMM's capacity is reserved for sparing.


Reference:
http://support.dell.com/support/edocs/systems/pet605/en/hom/install.htm

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