Lenovo System x3650 M5 Installation And Service Manual page 200

Table 13. Memory mirrored channel mode DIMM population sequence (continued)
Number of installed microprocessors
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 51. 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 51.
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.
Microprocessor 2
Figure 108. Connectors on each memory channel
Follow the installation sequence for rank sparing mode:
• Install at least two single-rank or dual-rank DIMMs in a channel.
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Lenovo System x3650 M5 Installation and Service Guide
CPU2
DIMM connector population sequence
2, 5
14, 17
8, 11
20, 23
19, 22
3, 6
15, 18
7, 10
Channel
Microprocessor 1
CPU1