Lenovo x3550 M4 Installation And Service Manual page 251
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v When you use memory mirrored channel, you must install a pair of DIMMs at a
time. The two DIMMs in each pair must be identical in size, type, and rank
(single, dual, or quad), and organization, but not in speed. The channels run at
the speed of the slowest DIMM in any of the channels.
v The maximum available memory is reduced to half of the installed memory
when memory mirrored channel is enabled. For example, if you install 64 GB of
memory using RDIMMs, only 32 GB of addressable memory is available when
you use memory mirrored channel.
v For UDIMMs, DIMM connectors 3, 6, 7, and 10 for microprocessor 1 and DIMM
connectors 15, 18, 19, and 22 for microprocessor 2 are not used in memory
mirrored channel mode.
The following diagram lists the DIMM connectors on each memory channel.
Figure 138. Connectors on each memory channel
The following table shows the installation sequence for memory mirrored channel
mode:
Table 22. Memory mirrored channel mode DIMM population sequence
Number of DIMMs
First pair of DIMMs
Second pair of DIMMs
Third pair of DIMMs
Fourth pair of DIMMs
Fifth pair of DIMMs
Sixth pair of DIMMs
Seventh pair of DIMMs
Eighth pair of DIMMs
Ninth pair of DIMMs
Tenth pair of DIMMs
Eleventh pair of DIMMs
Twelfth pair of DIMMs
Table note: DIMM connectors 3, 6, 7, 10, 15, 18, 19, and 22 are not used in memory
mirrored channel mode when UDIMMs are installed in the server.
Memory rank sparing:
The memory rank sparing feature disables the failed memory from the system
configuration and activates a rank sparing DIMM to replace the failed active
DIMM.
Number of installed
microprocessor
1
1
1
1
1
1
2
2
2
2
2
2
Chapter 6. Removing and replacing components
DIMM connector
1, 4
9, 12
2, 5
8, 11
3, 6
7, 10
13, 16
21, 24
14, 17
20, 23
15, 18
19, 22
233
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