Memory Configuration - NEC Express5800 A2040b Configuration Manual

CONFIGURATION GUIDE

3.2 Memory Configuration

Refer to the section in accordance with your memory configuration.
Memory configuration consists of 2 modes; "Independent Mode" and "Lockstep Mode".
Under each Mode, 2 features are available; "Memory Rank Sparing" and "Memory Mirroring".
Default setting at the server delivery is Lockstep Mode.

Independent Mode (only): Refer to

Lockstep Mode (only): Refer to

Memory Rank Sparing: Refer to

Memory Mirroring: Refer to
Please refer to "Memory" of "Reference" section for Memory on the Memory Riser Card (DIMM) installation
priority/order per Independent Mode, Lockstep Mode, Memory Rank Sparing and Memory Mirroring..
Memory Configuration Feature Comparison
See the table below for feature comparisons of memory configurations supported.
Summary
Available Memory
Available Memory
1
Channel
Maximum Memory
2
Capacity
Data Correction
Notes
1
4 memory channels per Memory Riser Card.
2
All DIMMs have the same capacity
NEC Corporation
–
NEC Express5800/A2040b, A2020b, A2010b, A1040b
3.2.1
3.2.2
3.2.3
3.2.4
Independent Mode
(only)
-
4
512GB(8GB RDIMM)
1024GB(16GB RDIMM)
2048GB(32GB LRDIMM)
4096GB(64GB LRDIMM)
ECC, x4 SDDC
 RDIMM and LRDIMM
cannot be mixed
Revision 7.0 – December 2014
Memory Rank Sparing
under Independent
Mode
In case of correctable
errors, switching
spare memory rank
1/2(8GB RDIMM),
3/4(16GB RDIMM),
7/8(32GB LRDIMM) or
3/4(64GB LRDIMM)
of physical memory
4
256GB(8GB RDIMM)
768GB(16GB RDIMM)
1792GB(32GB LRDIMM)
3072GB(64GB LRDIMM)
←
 RDIMM and LRDIMM
cannot be mixed
Memory Mirroring
under Independent Mode
Redundant memory
to
1/2 of physical memory
4
256GB(8GB RDIMM)
512GB(16GB RDIMM)
1024GB(32GB LRDIMM)
2048GB(64GB LRDIMM)
←
 RDIMM and LRDIMM
cannot be mixed
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