Setting Memory Mirroring And Address Based Memory Mirroring; How To Setup Memory Mirroring - NEC Express5800/A2040d User Manual

2.

Setting memory mirroring and address based memory mirroring

This section describes how to set memory mirroring and address based memory mirroring with
necmemras.
2.1

How to setup memory mirroring

necmemras allows enabling memory mirroring of each NUMA node the OS recognizes.
Setting memory mirroring as follows:
1. Installing necmemras
Install necmemras according to "3.1 Installing necmemras".
2. Check NUMA node.
Execute necmemras with "--show" option, and confirm the numbers of memory riser
corresponding to mirrored NUMA nodes. See "4 Necmemras Command Reference " for
details of command line of necmemras command.
Execution resultEx
# ./necmemras --show
Memory RAS Mode: Lockstep
Node:0 MR#1-2 (Base Memory)
Node:1 MR#3-4
Node:2 MR#5-6
Node:3 MR#7-8
3. Confirm the memory components.
In case of setup of memory mirroring, the mirrored memory riser must be under the
following rule. Before setup of memory mirroring, check the mirrored memory riser
confirmed by step2 satisfies the rule.
The populating rule for memory mirroring:
• The DIMMs used for Mirroring Pair between SMI channel must be of the same model.
In the supported system, if the capacities of each DIMM are same, the DIMMs are of the
same model. You can confirm the capacities of each DIMM by [System] tab -> [component]
-> [Memory] on Web console. Refer to "Express5800/A1040d, A2040d, A2020d, A2010d
User's Guide" for detailed information.
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