Lenovo System x3500 M5 Type 5464 Installation And Service Manual page 272

Table 37. Memory mirrored channel mode DIMM population sequence (continued)
Number of DIMMs
Ninth pair of DIMMs
Tenth pair of DIMMs
Eleventh pair of DIMMs
Twelfth pair of DIMMs
When you install or remove DIMMs, the server configuration information changes. When you restart the
server, the system displays a message that indicates that the memory configuration has changed.
Memory rank sparing
Sparing enables a failing rank to be replaced by ranks installed in an unoccupied space. An unused spare
rank on the channel can be used to copy the contents of a failing rank on that channel.
You can enable rank sparing memory in the Setup utility (see "Starting the Setup utility" on page 107).
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 107.
Note: After disabling the memory rank sparing mode, if a message prompts that the memory configuration is
not valid, restart the IMM2.1. 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 1
DIMM 2
DIMM 3
DIMM 4
DIMM 5
DIMM 6
Microprocessor 1
Channel
CPU1
DIMM 7
DIMM 8
DIMM 9
DIMM 10
DIMM 11
DIMM 12
Figure 173. Connectors on each memory channel
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System x3500 M5 Installation and Service Guide
Number of installed
microprocessor
2
2
2
2
DIMM 13
DIMM 14
DIMM 15
DIMM 16
DIMM 17
DIMM 18
Microprocessor 2
CPU2
DIMM 19
DIMM 20
DIMM 21
DIMM 22
DIMM 23
DIMM 24
DIMM connector
19, 22
7, 10
15, 18
3, 6