Lenovo x3650 M5, Installation And Service Manual

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Table 13. Memory mirrored channel mode DIMM population sequence (continued)
Number of installed microprocessors DIMM connector population sequence
1, 4
13, 16
9, 12
21, 24
2, 5
14, 17
8, 11
20, 23
19, 22
3, 6
15, 18
2
7, 10
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.
You can enable rank sparing memory in the Setup Utility, select System Settings ➙ Memory . For more
information, see “Using the Setup Utility” on page 52. When you use the memory rank sparing feature,
consider the following information:
• The memory rank sparing feature is supported on server models with an Intel Xeon E5-2600 v4 series
microprocessor.
• The maximum available memory is reduced when memory rank sparing mode is enabled.
• The memory rank sparing mode requires an even number of DIMMs. If your server has an odd number
of DIMMs installed, ensure that you disable the memory rank sparing mode from the Memory menu in
Setup Utility. See “Using the Setup Utility” on page 52.
Note: After disabling the memory rank sparing mode, if a message prompts that the memory configuration
is not valid, restart the IMM2. Alternatively, you can turn off the server, disconnect it from and then
reconnect it to ac power, and then turn on the server again.
The following diagram lists the DIMM connectors on each memory channel.
DIMM 3 DIMM 9 DIMM 6 DIMM 12 DIMM 2 DIMM 8 DIMM 5 DIMM 11 DIMM 1 DIMM 7 DIMM 4 DIMM 10
Microprocessor 1
Channel
CPU1
DIMM 15 DIMM 21 DIMM 18 DIMM 24 DIMM 14 DIMM 20 DIMM 17 DIMM 23 DIMM 13 DIMM 19 DIMM 16 DIMM 22
Microprocessor 2
CPU2
Figure 106. Connectors on each memory channel
Follow the installation sequence for rank sparing mode:
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Lenovo System x3650 M5 Installation and Service Guide