NEC Express5800/A1080a User Manual page 105

(1) Mirroring in the processor memory module
A1080a-S/A1080a-D models support mirroring in the processor memory module.
Mirroring is performed between memory controllers (memory controller#1 and memory
controller #2) in the same processor as shown below. A memory controller with a lower
number (memory controller#1) is mirrored in principle.
PAIR #1
PAIR #3
PAIR #5
PAIR #7
Memory
Controller #1
Processor
Mirroring in the processor memory module
Restrictions of using mirroring in the processor memory module
A1080a-S/A1080a-D Model:
 The memory capacity of memory buffer#1 and #2 and of memory buffer#3 and #4 to be
mirrored must be the same.
PAIR #2 PAIR #1
PAIR #3
PAIR #4
PAIR #5
PAIR #6
PAIR #7
PAIR #8
Memory
Controller #2
105
PAIR #2
PAIR #4
PAIR #6
Memory Memory
Controller #1 Controller #2
Processor
Hardware
Mirroring is not
performed when
memory capacity
differ.