NEC Express5800/A1080a, User Manual, Page: 109 / 696

Hardware
109
DIMM Sparing
DIMM sparing is one of the RAS functions. This function constantly duplicates the contents of
DIMM having a possibility of failure in a spare DIMM that is prepared separately. In case DIMM
failure occurs, it can protect the contents of DIMM by switching to the spare DIMM immediately.
Set DIMM sparing from “Memory Sparing” in Web Console.
Memory restrictions in using the DIMM sparing function.
A1080a-S/A1080a-D Model

The types and capacities of all DIMMs in PAIRs under memory buffers #1 and #2 must be
the same.
The types and capacities of all DIMMs in PAIRs under memory buffers #3 and #4 must be
the same.
PAIR #7 PAIR #8
PAIR #5 PAIR #6
DIMM #5
PAIR #3
DIMM #6 DIMM #7
PAIR #4
DIMM #8
DIMM #1
PAIR #1
DIMM #2 DIMM #3
PAIR #2
DIMM #4
DIMM #9
DIMM #14 DIMM #13
DIMM #10 DIMM #12 DIMM #11
DIMM #16 DIMM #15
Memory
Buffer #1
Memory
Buffer #2
Memory
Buffer #3
Memory
Buffer #4
Processor
Memory Controller #1 Memory Controller #2
Active
Standby
IMPORTANT:
● DIMM sparing and memory mirroring cannot be set
simultaneously.