
PRIMEQUEST 2000 Series Design Guide
2.2.2 Memory (7/7)
Memory Mirror
•
Mirroring is performed between the memory group in MB#xA and MB#xB and the memory
group in MB#xC and MB#xD that are controlled by the same CPU.
•
Memory Mirror is available even if only one CPU is installed in an SB.
Memory Spare
•
When multiple DIMM pairs are configured, a DIMM rank is used as a spare of other ranks.
•
If the number of correctable errors that occur in a specific time period in a rank exceeds a
threshold, the contents of the memory are copied to the rank that has been reserved as a
spare and the DIMM rank in which the errors occurred is disconnected.
* Memory Mirror and Memory Spare cannot be enabled at the same time.
Memory Spare
Memory Mirror
Mirroring is available only between the same types of memory.
Intra-CPU
mirroring
DIMM pair
Dual rank
Spare
DIMM pair
DIMM pair
Rank 0 Rank 0
DIMM pair
Single rank
Spare
Rank 0 Rank 0
Rank 0 Rank 0
DIMM pair
DIMM pair
DIMM A DIMM B
DIMM C DIMM D
DIMM E DIMM F
* The available memory capacity is two-thirds of the total capacity of the installed memory.
* The available memory capacity is five-sixths of the total capacity of the installed memory.
Rank 0 Rank 0
Rank 0 Rank 0
Rank 1 Rank 1
Rank 1 Rank 1
Rank 1 Rank 1
DIMM A DIMM B
DIMM C DIMM D
DIMM E DIMM F
Rank 0 Rank 0
Copyright 2016-2017 FUJITSU LIMITED
41