NEC Express5800/R120b-2 Guide de l'utilisateur Page 370

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9-38 Upgrading Your Server
Memory LockStep feature (x8 SDDC)
In LockStep feature, the DIMMs in two groups corresponding to two memory channels (channels 0
and 1) is multiplexed and operated in parallel to enable x8 SDDC (x8 Single Device Data
Correction). With this feature, a single device can detect and correct one to eight-bit error.
IMPORTANT:
The LockStep feature uses channels 0 and 1. When setting up this
feature, memory channel 2 of each CPU (CPU1-DIMM3/6,
CPU2-DIMM3/6) cannot be used. It is necessary to install an
additional N8102-387/388/389/390/391 memory stick.
CPU2-DIMM3
CPU1-DIMM1
CPU1-DIMM4
CPU1-DIMM2
CPU1- DIMM5
CPU1-DIMM3
CPU1-DIMM6
CPU2-DIMM4
CPU2-DIMM1
CPU2-DIMM5
CPU2-DIMM2
CPU2-DIMM6
Memory controller
Memory controller
CH0
CH0
CH1
CH1
CH2
CH2
CPU1
CPU2
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