NEC Server 140Rc-4 User Manual
Page 338
9-52 Upgrading Your Server
Online Spare Memory
The online spare memory feature places a memory group as spare memory in standby state. If the
current memory group often exceeded the predefined threshold for the maximum number of
correctable ECC errors occurrence, the online spare memory feature automatically switches to the
standby memory group by copying the contents of the current memory group into the standby
memory group. This feature enables continuous operation without replacement of the memory
board.
How to enable the online spare memory feature
– Installing additional memory boards
Add memory boards (DIMM) according to this chapter.
The installed memory boards must be the same capacities and type as the memory
boards installed as "DIMM group #1" and "DIMM group #2". Memory slots are as
shown for "DIMM group #3". The table below shows combinations of DIMMs
installed.
DIMM group #1
DIMM group #2
DIMM group #3
A
1GB (256MB*4)
Not installed
1GB (256MB*4)
B
1GB (256MB*4)
1GB (256MB*4)
1GB (256MB*4)
C
2GB (512MB*4)
Not installed
2GB (512MB*4)
D
2GB (512MB*4)
2GB (512MB*4)
2GB (512MB*4)
E
4GB (1GB*4)
Not installed
4GB (1GB*4)
F
4GB (1GB*4)
4GB (1GB*4)
4GB (1GB*4)
G
8GB (2GB*4)
Not installed
8GB (2GB*4)
H
8GB (2GB*4)
8GB (2GB*4)
8GB (2GB*4)
NOTES:
1. Column "DIMM group #3" shows sockets for online spare memory.
2. 1GB (256MB*4) Memory boards are installed in DIMM group #1
as standard when the server is delivered.
– Setting BIOS
The menu item below has been added to "Memory Configuration", which is
explained in Chapter 4. To enable the memory mirroring / online spare memory
feature, change the setting of the item to each. The item is factory-set to [Disabled].
Item
Parameter
Online Sparing/Mirroring memory
[Disabled]
Sparing
Mirroring