Using The Memory Ras Features - NEC N8100-1575F User Manual

Using the Memory RAS Features

The server has RAS feature including "Standard memory configuration (x4 SDDC ECC memory)
and "LockStep (x8 SDDC ECC memory) feature. SDDC (Single Device Correction) allows
automatic correction of memory error (multi-bit error).
IMPORTANT:
To use x4 SDDC ECC memory feature, additional 2-GB/4-GB
memory board is required. The factory-installed two 1-GB DIMMs
and additional 1-GB memory board is unavailable for x4 SDDC
feature.
"LockStep (x8 SDDC ECC memory) feature cannot be used
together with "Standard memory configuration (x4 SDDC ECC
memory)
The memory area on the motherboard of the server is divided into two memory channels as shown
in the figure below.
Memory controller
CH0
CPU1_DIMM 3
CPU1_DIMM 1
The LockStep feature keeps memory redundancy between memory channels by monitoring or
altering memory active/inactive status, respectively.
CPU1
CH1
CPU1_DIMM 4
CPU1_DIMM 2
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CPU2
Memory controller
CH0
CPU2_DIMM 3
CPU2_DIMM 1
CH1
CPU2_DIMM 4
CPU2_DIMM 2