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IBM
Eserver
xSeries 455 Planning and Installation Guide
Figure 3-2 shows the DIMM locations and the way the DIMMs are divided into
the two memory ports.
Figure 3-2 DIMM locations on the memory-board assembly
Memory mirroring
Memory mirroring is supported by the x455 for increased fault tolerance and high
levels of availability.
Key configuration rules relating to memory mirroring are:
Memory mirroring must be enabled in the System Setup in the EFI (it is
disabled by default). See “Enabling memory mirroring” on page 118.
Enabling memory mirroring halves the amount of memory available to the
operating system.
7
4 and 11
8
18 and 25
9
5 and 10
10
19 and 24
11
6 and 9
12
20 and 23
13
7 and 8
14
21 and 22
Pair
Port 1 DIMM slots
Pair
Port 2 DIMM slots
Port 1
Port 2
F
ront of
s
e
rv
er
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