NEC Express5800 120Rj-2 User Manual page 165

User Guide
■ DIMMs installed in a specific memory branch should have the same capacity. The
server operates properly as long as DIMMs of the same capacity are installed in
each memory branch. (For example, the server can operate if the total capacity of
memory branch 0 is different from that of memory branch 1.)
■ Run SETUP, change the parameters appropriately in the [Sparing] menu selected
as shown below, save the settings and exit from SETUP.
[Advanced], [Memory Configuration], [Sparing]
■ Install memory devices in the following order:
Group 1, Group 3, Group 5 for memory branch 0
Group 2, Group 4, Group 6 for memory branch 1
■ The spare memory group must be the group with the largest number within a
memory branch.
The following sparing can be neither configured nor set.
■ Sparing to another memory branch.
The table below lists examples of DIMM installation patterns enabling the online spare
memory feature to be used. While the following patterns are provided for memory
branch 0, the same patterns can also be adapted to memory branch 1.
Example
Depending on the specification of the memory controller, the spare memory is set in
units of rank memory.
The logical memory capacity of single rank memory differs from that of dual rank
memory when online spare memory is specified.
■ Single rank memory configuration
Logical memory capacity = (Physical memory capacity * Number of DIMMs) –
(Physical memory capacity)
■ Dual rank memory configuration
Logical memory capacity = (Physical memory capacity * Number of DIMMs) –
(Physical memory capacity / 2)
Memory Branch #0
(Group #)
#1 #3
1 1GB 1GB
2 1GB 1GB
3 2GB 2GB
4 2GB 2GB
5 4GB 4GB
6 4GB 4GB
7 8GB 8GB
8 8GB 8GB
Capacity
#5 Physical
- 2GB
1GB 3GB
- 4GB
2GB 6GB
- 8GB
4GB 12GB
- 16GB
8GB 24GB
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Logical
1GB
2GB
3GB
5GB
6GB
10GB
12GB
20GB