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Memory Mirroring Feature
Memory Mirroring Feature
The memory mirroring feature sets a memory board as spare memory in standby state. If the current memory board
encounters an uncorrectable error, the memory mirroring feature switches to the standby memory board. When this
feature is used, the current memory board and the standby memory board should be combined. Available combinations
are:
Mirroring with a pair of memory boards A and B and a pair of memory boards C and D
To enable the memory mirroring feature, the combined memory boards must have DIMMs of same size and capacities.
Setting the BIOS
Start SETUP and select [Advanced] → [Memory Configuration] → [Memory RAS Feature] perform the following
settings:
To enable the memory mirroring feature: Select [Mirror].
Others
Memory capacity displayed on the OS = total capacity of physically installed memory – capacity for standby
memory
Memory mirroring feature: 1/2 of actually installed memory capacity
Enabling the memory mirroring feature does not influence the applications operations.
The mirroring feature is automatically disabled when an error message is displayed:
The following indicates that the memory mirroring feature is in use:
a) The failing DIMM group is degraded when the server restarts.
b) If the NEC ESMPRO Agent has been installed, the following log is registered as a system log of Event
Viewer:
Source name:
Event ID:
Explanation:
Memory number: XX
Date/time:
c) If a report setting is specified through the NEC ESMPRO Agent, a Manager reporting and ALIVE
reporting are performed. The report contents are as follows:
Explanation:
Memory number: XX
Date/time:
ESMCommonService
2313
Part of the DIMM was isolated due to a memory error.
XX
Part of the DIMM was isolated due to a memory error.
XX
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