NEC Express5800 Series User Manual page 77

Chapter 2 Preparations
The followings are the conditions to use this function.
Use DIMMS with the same product number for the device.
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Mount DIMMs in the DIMM socket that constitutes the spare set.
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Change the following parameters and save them.
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From System Utility, set "System Configuration > BIOS/Platform Configuration (RBSU) >
Memory Options > Advanced Memory Protection" to "Online Spare with Advanced ECC Support".
After rebooting, confirm "Advanced Memory Protection Mode：Online Spare with Advanced ECC" is
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displayed in POST.
The following memory sparings cannot be constructed.
Mounting DIMMs with different product numbers on the spare set
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Memory sparing between different memory channels
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Notes for the configuration of memory sparing
Even if you set "Advanced Memory Protection" to "Online Spare with Advanced ECC Support" and
select memory sparing configuration, in case DIMM configuration which cannot constitute memory
sparing due to expansion or removal of DIMM is detected, "Advanced Memory Protection" operates
as "Advanced ECC".
In this case,"Advanced ECC Support" is displayed in POST's "Advanced Memory Protection Mode".
IML also records the relevant error events.
Notes for replacements at failure
At the time of failure, identify damaged DIMM(s) from IML and replace DIMM(s) one by one.
Note
Use memories with the same product number for the device.
Express5800/R120h-1E User's Guide
1. Installing Internal Optional Devices
77