Lenovo ThinkSystem SR630 Maintenance Manual page 164
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Table 46. Independent mode with two processors (DIMMs with different capacities) (continued)
Configura-
tion
17
18
4 DIMMs
8 DIMMs
16
17
DIMMs
1,2
24
17
DIMMs
1,2
32
17
18
DIMMs
1,2
Notes:
1. DIMM configurations that support Sub NUMA Clustering (SNC), which can be enabled via UEFI. SNC is
not supported if DIMM population does not follow the sequence indicated by the table above.
2. DIMM configurations that support Software Guard Extensions (SGX). See "Enable Software Guard
Extensions (SGX)" in Setup Guide to enable this feature.
Mirroring mode
Memory-mirroring mode provides full memory redundancy while reducing the total system memory capacity
in half. Memory channels are grouped in pairs with each channel receiving the same data. If a failure occurs,
the memory controller switches from the DIMMs on the primary channel to the DIMMs on the backup
channel. The DIMM installation order for memory mirroring varies based on the number of processors and
DIMMs installed in the server.
In mirroring mode, each memory module in a pair must be identical in size and architecture. The channels are
grouped in pairs with each channel receiving the same data. One channel is used as a backup of the other,
which provides redundancy.
Follow the rules below when installing memory modules in mirroring mode:
• All memory modules to be installed must be of the same type with the same capacity, frequency, voltage,
and ranks.
• Mirroring can be configured across channels, and the total DDR4 memory size of the primary and
secondary channels must be the same.
The following table shows the memory module population sequence for mirroring mode when only one
processor (CPU 1) is installed.
Table 47. Mirroring mode with one processor (CPU 1)
Configura-
tion
1
2
8 DIMMs
1
16 DIMMs
1
2
Note: DIMM configurations listed in the table support the Sub NUMA Clustering (SNC) feature, which can be
enabled via UEFI. SNC is not supported if DIMM population does not follow the sequence indicated by the
table above.
ThinkSystem SR630 V2 Maintenance Manual
154
19
20
21
22
23
19
21
19
21
19
21
23
19
20
21
23
19
20
21
22
23
3
4
5
6
3
5
3
4
5
6
DIMM slots
24
25
26
26
24
25
26
24
25
26
DIMM slots
7
8
9
10
7
10
7
8
9
10
27
28
29
30
28
30
28
30
28
29
30
27
28
29
30
11
12
13
14
12
14
11
12
13
14
31
32
32
32
31
32
15
16
16
15
16
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