Lenovo ThinkServer TD350 70DG User Manual And Hardware Maintenance Manual page 93

Table 3. Memory module installation rules for servers with two microprocessors
A1
4 DIMMs X
8 DIMMs X
16 DIMMs X
The following section explains the memory module installation rules in independent mode, mirroring mode,
sparing mode, and lockstep mode.
Memory module installation order in independent mode
In independent mode, the RAS features are not 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.
The following table explains the memory module installation order for servers that have only one
microprocessor (CPU1) installed.
Table 4. Memory module installation order in independent mode for servers with one microprocessor
CPU1 DIMM A1
DIMM
1
installation order
The following table explains the memory module installation order for servers that have two microprocessors
(CPU1 and CPU2) installed.
Table 5. Memory module installation order in independent mode for servers with two microprocessors
A1
DIMM
1
installation order
Memory module installation order in mirroring mode
In mirroring mode, the server maintains two identical copies of all data in memory and 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.
The following table explains the memory module installation order for servers that have only one
microprocessor (CPU1) installed.
Table 6. Memory module installation order in mirroring mode for servers with one microprocessor
CPU1 DIMM A1
DIMM
1
installation order
CPU1 DIMM
A2 B1 B2 C1 C2
X
X X
X X X X
A2 B1
5 2
CPU1 DIMM
A2 B1 B2 C1 C2
9 3 11 5 13
A2 B1
5
2
D1 D2 A1 A2
X
X X
X X X X X
B2 C1
6 3
D1 D2 A1 A2
7 15 2 10
B2 C1
6 3
CPU2 DIMM
B1 B2 C1 C2 D1
X
X X X
X X X X X
C2 D1
7 4
CPU2 DIMM
B1 B2 C1 C2 D1
4 12 6 14
C2 D1
7
4
.
Chapter 6 Replacing hardware
D2
X
D2
8
D2
8 16
D2
8
79