Memory Configuration - NEC Express5800/A2040c Configuration Manual

CONFIGURATION GUIDE

3.2 Memory Configuration

Please go to the appropriate section below 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/A2040c, A2020c, A2010c, A1040c
3.2.1
3.2.2
3.2.3
3.2.4
Independent Mode
(only)
-
4
512GB(8GB RDIMM)
1024GB(16GB RDIMM)
2048GB(32GB RDIMM)
2048GB(32GB LRDIMM)
ECC, x4 SDDC
 RDIMM and LRDIMM
cannot be mixed
Rev.2.0 –Sep. 2015
Memory Rank Sparing
under Independent Mode
In case of correctable
errors, switching to spare
memory rank
1/2(8GB RDIMM),
3/4, 1/2(16GB RDIMM)
of physical memory
4
256GB(8GB RDIMM)
768GB, 512GB(16GB RDIMM)
←
 Need to order memory for
sparing
Memory Mirroring
under Independent Mode
Redundant memory
having the same data
1/2 of physical memory
4
256GB(8GB RDIMM)
512GB(16GB RDIMM)
←
 Need to order memory for
mirroring
22