NEC Express5800 Series User Manual page 66

Chapter 2 Preparations
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Memory Sparing Feature
Memory Sparing feature puts a memory channel 2 of a memory controller in each CPU into standby status as
spare devices. If a correctable error occurs in a DIMM in the running memory controller, the feature
automatically changes the running DIMM from the failed one to a DIMM in the standby state to continue the
processing.
The following table shows configuration allowable for memory sparing and system logical memory capacity.
Number of CPUs
66
Note
To use Memory Sparing feature, install N8102-622/623 additional memory board
(three DIMMs of same model).
DIMMs installed in the system must be of the same model number.
Tips
The operating system can use the DIMMs as those with capacities less than the
actual physical capacities. The capacities vary depending on the number of
DIMMs and the physical capacity per DIMM.
Number of DIMMs
1 2
4
6
8
2 4
6
8
10
12
14
16
Express5800/R120f-1E User's Guide
Capacity of DIMM installed
16GB
24GB
48GB
72GB
96GB
48GB
72GB
96GB
120GB
144GB
168GB
192GB
1. Installing Internal Options