NEC Express5800/T120d User Manual page 74

Chapter 2 Preparations
(3) 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
74
Note
To use Memory Sparing feature, install N8102-486/487 additional memory board (three
DIMMs of same model).
DIMMs to be installed in sparing set must have same capacity.
 The operating system recognizes the DIMMs as those with capacities less than the
Tips
actual physical capacities. (The recognized capacities vary depending on the number of
DIMMs and the physical capacity per DIMM.)
 DIMMs to be installed in sparing set must have same capacity.
Number of
DIMMs
N8102-486 (8GB x2)
1 2
4
6
2 4
8
12
Express5800/T120d User's Guide
Capacity of DIMM installed
N8102-487 (16GB x2)
12GB 24GB
24GB 48GB
36GB 72GB
24GB 48GB
48GB 96GB
72GB 144GB
1. Installing Internal Optional Devices