Dimm Sparing - NEC Express5800/A1080a User Manual

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 #1
Active
PAIR #3
PAIR #5
Standby
PAIR #7
IMPORTANT:
● DIMM sparing and memory mirroring cannot be set
simultaneously.
DIMM #1 DIMM #2
DIMM #5 DIMM #6
DIMM #10
DIMM #9
DIMM #13 DIMM #14
Memory Memory
Buffer #1 Buffer #2
Memory Controller #1
PAIR #2
PAIR #4
PAIR #6
PAIR #8
Processor
109
Hardware
DIMM #3 DIMM #4
DIMM #7 DIMM #8
DIMM #12
DIMM #11
DIMM #15 DIMM #16
Memory
Memory
Buffer #3
Buffer #4
Memory Controller #2