IBM xSeries 455 Installation Manual page 32

v Each DIMM in a pair must be of the same size and technology to ensure that the
v You can configure your server to use memory mirroring and memory scrubbing.
v When using memory mirroring, you must install two pairs of DIMMs at a time.
v You can replace a failed DIMM while the server is on, provided that you have
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xSeries 455: Installation Guide
Table 1. DIMM installation sequence (continued)
Pair DIMM connectors (port 1)
11 6 and 9
13 7 and 8
Port 1
server will operate properly.
For detailed information about configuring your server and using these features,
see the User's Guide on the IBM xSeries Documentation CD.
The four DIMMs in each bank must be identical. The following table shows the
pairs that are in each bank. See Table 1 on page 19 for the DIMM connector pair
assignments.
Table 2. Memory mirroring DIMM installation sequence
Bank DIMM pairs
1 1 and 2
2 3 and 4
3 5 and 6
4 7 and 8
enabled memory mirroring and that you have installed all DIMMs in the sequence
to support memory mirroring.
If a problem with a DIMM is detected, light path diagnostics will light the
system-error LED on the front of the server, indicating that there is a problem
and guide you to the defective DIMM. When this occurs, first identify the
defective DIMM; then, remove and replace the DIMM.
Pair DIMM connectors (port 2)
12 20 and 23
14 21 and 22
Port 2
DIMM error LEDs
are built into each handle
Bank DIMM pairs
5 9 and 10
6 11 and 12
7 13 and 14