NEC Server 140Rc-4 - Manual (Page 337)

Upgrading Your Server 9-51
Memory Mirroring / Online Spare Memory Feature
The server provides the memory mirroring and online spare memory features.
To use either of these features, install standby memory boards in the server and select the desired
feature from the BIOS setup operation.
NOTES:
„ To enable memory mirroring /online spare memory feature, memory
boards in DIMM group #1 and #3 must be the same capacities and
type.
„
Contact your service representative if you need to use these features.
Memory Mirroring Feature
The memory mirroring feature places a memory group as spare memory in standby state. If the
current memory group encounters an uncorrectable error, the memory mirroring feature switches to
the standby memory group. When this feature is used, the current memory group and the standby
memory group should be located in DIMM group #1 and DIMM group #3, respectively. Memory
boards (DIMM) cannot be installed in DIMM group #2.
„ How to enable the memory mirroring feature
– Installing additional memory boards
Add memory boards (DIMM) according to the User's Guide.
The memory boards for mirroring should be installed to memory slots belonging to
"DIMM group #3. The installed memory boards must be the same capacities and
type as the memory boards installed as "DIMM group #1." The table below shows
combinations of DIMMs installed.
DIMM group #1 DIMM group #2
DIMM group #3
(Memory boards for mirroring)
A 1GB (256MB*4) Not installed 1GB (256MB*4)
B 2GB (512MB*4) Not installed 2GB (512MB*4)
C 4GB (1GB*4) Not installed 4GB (1GB*4)
D 8GB (2GB*4) Not installed 8GB (2GB*4)
NOTES:
„ 1GB (256MB*4) memory boards are installed in DIMM group #1
as standard when the server is delivered.
„ Column "DIMM group #3" shows sockets for online spare memory.