Lenovo ThinkServer TD350 User Manual
Page 94
The following table explains the memory module installation order for servers that have two microprocessors
(CPU1 and CPU2) installed.
Table 7. Memory module installation order in mirroring mode for servers with two microprocessors
CPU1 DIMM
CPU2 DIMM
A1
A2
B1
B2
C1
C2
D1
D2
A1
A2
B1
B2
C1
C2
D1
D2
DIMM
installation order
1
9
2
10
5
13
6
14
3
11
4
12
7
15
8
16
Memory module installation order in sparing mode
The sparing mode provides memory redundancy. In this mode, the RAS features are available. For
information about the RAS features, refer to the related section in “Features” on page 8.
Note: All memory modules to be installed must be the same type (LV RDIMM or RDIMM). It is also
recommended that all memory modules have the same frequency, voltage, and number of ranks.
Your server supports rank sparing mode. In rank sparing mode, one rank of a memory module works as the
spare rank for the other ranks on the same channel. The spare rank is not available as system memory. To
enable rank sparing mode, ensure that:
• At least three ranks are available in one channel.
• The capacity of the spare rank must be the same with or larger than the capacity of other ranks within
the same channel.
The following table explains the memory module installation order for servers that have only one
microprocessor (CPU1) installed.
Table 8. Memory module installation order in sparing mode for servers with one microprocessor
CPU1 DIMM
A1
A2
B1
B2
C1
C2
D1
D2
DIMM
installation order
1
2
3
4
5
6
7
8
The following table explains the memory module installation order for servers that have two microprocessors
(CPU1 and CPU2) installed.
Table 9. Memory module installation order in sparing mode for servers with two microprocessors
CPU1 DIMM
CPU2 DIMM
A1
A2
B1
B2
C1
C2
D1
D2
A1
A2
B1
B2
C1
C2
D1
D2
DIMM
installation order
1
2
5
6
9
10
13
14
3
4
7
8
11
12
15
16
Memory module installation order in lockstep mode
In lockstep mode, the RAS features are available. For information about the RAS features, refer to the
related section in “Features” on page 8.
Note: All memory modules to be installed must be the same type (LV RDIMM or RDIMM). It is also
recommended that all memory modules have the same frequency, voltage, and number of ranks.
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ThinkServer TD350 User Guide and Hardware Maintenance Manual