Installing a DIMM
Use this information to install a DIMM.
- Read Safety and Installation guidelines.
- Read the documentation that comes with the DIMMs.
- If the compute node is installed in a Flex System chassis, remove it (see Removing a compute node from a chassis for instructions).
- Carefully lay the compute node on a flat, static-protective surface, orienting the compute node with the bezel pointing toward you.
This component can be installed as an optional device or as a CRU. The installation procedure is the same for the optional device and the CRU.
After you install or remove a DIMM, you must change and save the new configuration information by using the Setup utility. When you turn on the compute node, a message indicates that the memory configuration has changed. Start the Setup utility and select Save Settings (see Using the Setup utility for more information) to save changes.
- Verify that the amount of installed memory is the expected amount of memory through the operating system, by watching the monitor as the compute node starts, by using the CMM sol command, or through the management node (if available).
- For more information about the CMM sol command, see the "Flex System Chassis Management Module: Command-Line Interface Reference Guide".
- For more information about Lenovo XClarity Administrator, see the Lenovo XClarity Administrator information page.
- For more information about Flex System Manager management software, see "Flex System Manager Software: Installation and Service Guide".
- Run the Setup utility to reenable the DIMMs (see Using the Setup utility for more information).
The compute node has a total of 48 dual inline memory module (DIMM) connectors. The compute node supports low-profile (LP) DDR3 DIMMs with error-correcting code (ECC) in 4 GB, 8 GB, 16 GB and 32 GB capacities.
The following illustration shows the system-board components, including the DIMM connectors.
![Graphic illustrating the system-board connectors](dw1ks015.jpg)
The memory is accessed internally through 16 channels (four channels for each microprocessor). Each channel contains three DIMM connectors. Each channel can have a maximum of eight ranks. The following table lists each channel and shows which DIMM connectors are in the channel.
Microprocessor | Memory channel | DIMM connectors |
---|---|---|
Microprocessor 1 | Channel 1 | 1, 2, and 3 |
Channel 0 | 4, 5, and 6 | |
Channel 2 | 7, 8, and 9 | |
Channel 3 | 10, 11, and 12 | |
Microprocessor 2 | Channel 1 | 13, 14, and 15 |
Channel 0 | 16, 17, and 18 | |
Channel 2 | 19, 20, and 21 | |
Channel 3 | 22, 23, and 14 | |
Microprocessor 3 | Channel 2 | 25, 26, and 27 |
Channel 3 | 28, 29, and 30 | |
Channel 1 | 31, 32, and 33 | |
Channel 0 | 34, 35, and 36 | |
Microprocessor 4 | Channel 2 | 37, 38, and 39 |
Channel 3 | 40, 41, and 42 | |
Channel 1 | 43, 44, and 45 | |
Channel 0 | 46, 47, and 48 |
- You cannot mix RDIMMs, LRDIMMs and UDIMMs in the same compute node.
- UDIMMs are not supported at three DIMMs per channel.
- A total of eight ranks on each channel is supported.
- If a quad-rank DIMM is installed, install it in the connector at the end of the memory channel.
- If a channel has one or more quad-rank RDIMMs, only two DIMMs per channel is supported. The quad-rank, eight rank per channel limitation only applies to RDIMMs. Quad-rank LRDIMMs can be installed at three DIMMs per channel since the processor recognizes LRDIMMs as dual-rank DIMMs.
- Independent-channel mode: Independent-channel mode provides a maximum of 384 GB of usable memory per processor and 1536 GB of usable memory with all four processors installed using 32 GB DIMMs. DIMMs must be first installed in the last physical DIMM connector of each channel. DIMMs should also be installed one DIMM per channel first. The best performance is seen with an even memory distribution among all four channels on the microprocessor. DIMMs can be installed without matching sizes. Individual channels may run at different DIMM timings, but all channels must run at the same interface frequency. DIMMs with different timing parameters can be installed in different connectors of the same channel, but only timings that support the slowest DIMM are applied to all the DIMMs. Faster DIMMs operate at timings that are supported by the slowest installed DIMM.
- Mirrored-channel mode: In mirrored-channel mode, memory is installed in pairs. Both DIMMs in a pair must be identical in capacity, type, and rank count. 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. In mirrored-channel mode, memory must be installed in pairs. The memory content is mirrored between channel 0 and channel 1 and between channel 2 and channel 3. Mirrored-channel mode requires that channel 0 and channel 1, and channel 2 and channel 3 are be populated identically in regard to size and organization. DIMM connector populations within a channel do not have to be identical, but the same DIMM connector location across channel 0 and channel 1 and across channel 2 and channel 3 must be populated in the same way. The effective memory that is available to the system is only half of what is installed.
- Rank-sparing mode: In rank-sparing mode, one memory DIMM rank serves as a spare of the other ranks on the same channel. The spare rank is held in reserve and is not used as active memory. The spare rank must have identical or larger memory capacity than all the other active DIMM ranks on the same channel. After an error threshold is surpassed, the contents of that rank are copied to the spare rank. The failed rank of DIMMs is taken offline, and the spare rank is put online and used as active memory in place of the failed rank.The following notes describe additional information that you must consider when you select rank-sparing memory mode:
- Memory sparing on one channel is independent of the sparing on all other channels.
- You can use the Setup utility to determine the status of the DIMM ranks.
- If only one DIMM is present in a channel and the DIMM is dual or single rank, then sparing mode should not be enabled.
Install DIMMs in the order that is indicated in the following table for independent-channel mode.
Number of DIMMs installed | 1 microprocessor installed | 2 microprocessors installed | 4 microprocessors installed |
---|---|---|---|
1 | DIMM 4 | DIMM 4 | DIMM 4 |
2 | DIMMs 1 and 4 | DIMMs 4 and 16 | DIMMs 4 and 16 |
3 | DIMMs 1, 4, and 9 | DIMMs 1, 4, and 16 | DIMMs 4, 16, and 33 |
4 | DIMMs 1, 4, 9, and 12 | DIMMs 1, 4, 13, and 16 | DIMMs 4, 16, 33, and 45 |
5 | DIMMs 1, 4, 9, 5, and 12 | DIMMs 1, 4, 9, 13, and 16 | DIMMs 1, 4, 16, 33, and 45 |
6 | DIMMs 1, 2, 4, 9, 5, and 12 | DIMMs 1, 4, 9, 13, 16, and 21 | DIMMs 1, 4, 13, 16, 33, and 45 |
7 | DIMMs 1, 2, 4, 8, 9, 5, and 12 | DIMMs 1, 4, 9, 12, 13, 16, and 21 | DIMMs 1, 4, 13, 16, 33, 36, and 45 |
8 | DIMMs 1, 2, 4, 8, 9, 5, 11, and 12 | DIMMs 1, 4, 9, 12, 13, 16, 21, and 24 | DIMMs 1, 4, 13, 16, 33, 36, 45, and 48 |
9 | DIMMs 1, 2, 4, 6, 8, 9, 5, 11, and 12 | DIMMs 1, 4, 5, 9, 12, 13, 16, 21, and 24 | DIMMs 1, 4, 9, 13, 16, 33, 36, 45, and 48 |
10 | DIMMs 1, 2, 3, 4, 6, 8, 9, 5, 11, and 12 | DIMMs 1, 4, 5, 9, 12, 13, 16, 17, 21, and 24 | DIMMs 1, 4, 9, 13, 16, 21, 33, 36, 45, and 48 |
11 | DIMMs 1, 2, 3, 4, 6, 7, 8, 9, 5, 11, and 12 | DIMMs 1, 2, 4, 5, 9, 12, 13, 16, 17, 21, and 24 | DIMMs 1, 4, 9, 13, 16, 21, 28, 33, 36, 45, and 48 |
12 | DIMMs 1, 2, 3, 4, 6, 7, 8, 9, 10, 5, 11, and 12 | DIMMs 1, 2, 4, 5, 9, 12, 13, 14, 16, 17, 21, and 24 | DIMMs 1, 4, 9, 13, 16, 21, 28, 33, 36, 40, 45, and 48 |
13 | DIMMs 1, 2, 4, 5, 8, 9, 12, 13, 14, 16, 17, 21, and 24 | DIMMs 1, 4, 9, 12, 13, 16, 21, 28, 33, 36, 40, 45, and 48 | |
14 | DIMMs 1, 2, 4, 5, 8, 9, 12, 13, 14, 16, 17, 20, 21, and 24 | DIMMs 1, 4, 9, 12, 13, 16, 21, 24, 28, 33, 36, 40, 45, and 48 | |
15 | DIMMs 1, 2, 4, 5, 8, 9, 11, 12, 13, 14, 16, 17, 20, 21, and 24 | DIMMs 1, 4, 9, 12, 13, 16, 21, 24, 25, 28, 33, 36, 40, 45, and 48 | |
16 | DIMMs 1, 2, 4, 5, 8, 9, 11, 12, 13, 14, 16, 17, 20, 21, 23, and 24 | DIMMs 1, 4, 9, 12, 13, 16, 21, 24, 25, 28, 33, 36, 37, 40, 45, and 48 | |
17 | DIMMs 1, 2, 4, 5, 6, 8, 9, 11, 12, 13, 14, 16, 17, 20, 21, 23, and 24 | DIMMs 1, 4, 5, 9, 12, 13, 16, 21, 24, 25, 28, 33, 36, 37, 40, 45, and 48 | |
18 | DIMMs 1, 2, 4, 5, 6, 8, 9, 11, 12, 13, 14, 16, 17, 18, 20, 21, 23, and 24 | DIMMs 1, 4, 5, 9, 12, 13, 16, 17, 21, 24, 25, 28, 33, 36, 37, 40, 45, and 48 | |
19 | DIMMs 1, 2, 3, 4, 5, 6, 8, 9, 11, 12, 13, 14, 16, 17, 18, 20, 21, 23, and 24 | DIMMs 1, 4, 5, 9, 12, 13, 16, 17, 21, 24, 25, 28, 32, 33, 36, 37, 40, 45, and 48 | |
20 | DIMMs 1, 2, 3, 4, 5, 6, 8, 9, 11, 12, 13, 15, 14, 16, 17, 18, 20, 21, 23, and 24 | DIMMs 1, 4, 5, 9, 12, 13, 16, 17, 21, 24, 25, 28, 32, 33, 36, 37, 40, 44, 45, and 48 | |
21 | DIMMs 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, 15, 14, 16, 17, 18, 20, 21, 23, and 24 | DIMMs 1, 2, 4, 5, 9, 12, 13, 16, 17, 21, 24, 25, 28, 32, 33, 36, 37, 40, 44, 45, and 48 | |
22 | DIMMs 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, 15, 14, 16, 17, 18, 19, 20, 21, 23, and 24 | DIMMs 1, 2, 4, 5, 9, 12, 13, 14, 16, 17, 21, 24, 25, 28, 32, 33, 36, 37, 40, 44, 45, and 48 | |
23 | DIMMs 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 14, 16, 17, 18, 19, 20, 21, 23, and 24 | DIMMs 1, 2, 4, 5, 9, 12, 13, 14, 16, 17, 21, 24, 25, 28, 32, 33, 35, 36, 37, 40, 44, 45, and 48 | |
24 | DIMMs 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 14, 16, 17, 18, 19, 20, 21, 22, 23, and 24 | DIMMs 1, 2, 4, 5, 9, 12, 13, 14, 16, 17, 21, 24, 25, 28, 32, 33, 35, 36, 37, 40, 44, 45, 47, and 48 | |
25 | DIMMs 1, 2, 4, 5, 8, 9, 12, 13, 14, 16, 17, 21, 24, 25, 28, 32, 33, 35, 36, 37, 40, 44, 45, 47, and 48 | ||
26 | DIMMs 1, 2, 4, 5, 8, 9, 12, 13, 14, 16, 17, 20, 21, 24, 25, 28, 32, 33, 35, 36, 37, 40, 44, 45, 47, and 48 | ||
27 | DIMMs 1, 2, 4, 5, 8, 9, 12, 13, 14, 16, 17, 20, 21, 24, 25, 28, 29, 32, 33, 35, 36, 37, 40, 44, 45, 47, and 48 | ||
28 | DIMMs 1, 2, 4, 5, 8, 9, 12, 13, 14, 16, 17, 20, 21, 24, 25, 28, 29, 32, 33, 35, 36, 37, 40, 41, 44, 45, 47, and 48 | ||
29 | DIMMs 1, 2, 4, 5, 8, 9, 11, 12, 13, 14, 16, 17, 20, 21, 24, 25, 28, 29, 32, 33, 35, 36, 37, 40, 41, 44, 45, 47, and 48 | ||
30 | DIMMs 1, 2, 4, 5, 8, 9, 11, 12, 13, 14, 16, 17, 20, 21, 23, 24, 25, 28, 29, 32, 33, 35, 36, 37, 40, 41, 44, 45, 47, and 48 | ||
31 | DIMMs 1, 2, 4, 5, 8, 9, 11, 12, 13, 14, 16, 17, 20, 21, 23, 24, 25, 26, 28, 29, 32, 33, 35, 36, 37, 40, 41, 44, 45, 47, and 48 | ||
32 | DIMMs 1, 2, 4, 5, 8, 9, 11, 12, 13, 14, 16, 17, 20, 21, 23, 24, 25, 26, 28, 29, 32, 33, 35, 36, 37, 38, 40, 41, 44, 45, 47, and 48 | ||
33 | DIMMs 1, 2, 4, 5, 6, 8, 9, 11, 12, 13, 14, 16, 17, 20, 21, 23, 24, 25, 26, 28, 29, 32, 33, 35, 36, 37, 38, 40, 41, 44, 45, 47, and 48 | ||
34 | DIMMs 1, 2, 4, 5, 6, 8, 9, 11, 12, 13, 14, 16, 17, 18, 20, 21, 23, 24, 25, 26, 28, 29, 32, 33, 35, 36, 37, 38, 40, 41, 44, 45, 47, and 48 | ||
35 | DIMMs 1, 2, 4, 5, 6, 8, 9, 11, 12, 13, 14, 16, 17, 18, 20, 21, 23, 24, 25, 26, 28, 29, 31, 32, 33, 35, 36, 37, 38, 40, 41, 44, 45, 47, and 48 | ||
36 | DIMMs 1, 2, 4, 5, 6, 8, 9, 11, 12, 13, 14, 16, 17, 18, 20, 21, 23, 24, 25, 26, 28, 29, 31, 32, 33, 35, 36, 37, 38, 40, 41, 43, 44, 45, 47, and 48 | ||
37 | DIMMs 1, 2, 3, 4, 5, 6, 8, 9, 11, 12, 13, 14, 16, 17, 18, 20, 21, 23, 24, 25, 26, 28, 29, 31, 32, 33, 35, 36, 37, 38, 40, 41, 43, 44, 45, 47, and 48 | ||
38 | DIMMs 1, 2, 3, 4, 5, 6, 8, 9, 11, 12, 13, 14, 15, 16, 17, 18, 20, 21, 23, 24, 25, 26, 28, 29, 31, 32, 33, 35, 36, 37, 38, 40, 41, 43, 44, 45, 47, and 48 | ||
39 | DIMMs 1, 2, 3, 4, 5, 6, 8, 9, 11, 12, 13, 14, 15, 16, 17, 18, 20, 21, 23, 24, 25, 26, 28, 29, 31, 32, 33, 34, 35, 36, 37, 38, 40, 41, 43, 44, 45, 47, and 48 | ||
40 | DIMMs 1, 2, 3, 4, 5, 6, 8, 9, 11, 12, 13, 14, 15, 16, 17, 18, 20, 21, 23, 24, 25, 26, 28, 29, 31, 32, 33, 34, 35, 36, 37, 38, 40, 41, 43, 44, 45, 46, 47, and 48 | ||
41 | DIMMs 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, 14, 15, 16, 17, 18, 20, 21, 23, 24, 25, 26, 28, 29, 31, 32, 33, 34, 35, 36, 37, 38, 40, 41, 43, 44, 45, 46, 47, and 48 | ||
42 | DIMMs 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 23, 24, 25, 26, 28, 29, 31, 32, 33, 34, 35, 36, 37, 38, 40, 41, 43, 44, 45, 46, 47, and 48 | ||
43 | DIMMs 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 23, 24, 25, 26, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 40, 41, 43, 44, 45, 46, 47, and 48 | ||
44 | DIMMs 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 23, 24, 25, 26, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 40, 41, 42, 43, 44, 45, 46, 47, and 48 | ||
45 | DIMMs 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 23, 24, 25, 26, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 40, 41, 42, 43, 44, 45, 46, 47, and 48 | ||
46 | DIMMs 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 40, 41, 42, 43, 44, 45, 46, 47, and 48 | ||
47 | DIMMs 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 40, 41, 42, 43, 44, 45, 46, 47, and 48 | ||
48 | DIMMs 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, and 48 |
Install DIMMs in the order that is indicated in the following table for mirrored-channel mode.
Number of DIMM pairs installed | 1 microprocessor installed | 2 microprocessor installed | 4 microprocessor installed |
---|---|---|---|
1 | DIMMs 1 and 41 | DIMMs 1 and 41 | DIMMs 1 and 41 |
2 | DIMMs 1 and 4, 9 and 121 | DIMMs 1 and 4, 13 and 161 | DIMMs 1 and 4, 13 and 161 |
3 | DIMMs 1 and 4, 9 and 12, 2 and 51 | DIMMs 1 and 4, 13 and 16, 9 and 121 | DIMMs 1 and 4, 13 and 16, 33 and 361 |
4 | DIMMs 1 and 4, 9 and 12, 2 and 5, 8 and 111 | DIMMs 1 and 4, 13 and 16, 9 and 12, 21 and 241 | DIMMs 1 and 4, 13 and 16, 33 and 36, 45 and 481 |
5 | DIMMs 1 and 4, 9 and 12, 2 and 5, 8 and 11, 3 and 61 | DIMMs 1 and 4, 13 and 16, 9 and 12, 21 and 24, 2 and 51 | DIMMs 1 and 4, 13 and 16, 33 and 36, 45 and 48, 9 and 121 |
6 | DIMMs 1 and 4, 9 and 12, 2 and 5, 8 and 11, 3 and 6, 7 and 101 | DIMMs 1 and 4, 13 and 16, 9 and 12, 21 and 24, 2 and 5, and 14 and 171 | DIMMs 1 and 4, 13 and 16, 33 and 36, 45 and 48, 9 and 12, 21 and 241 |
7 | DIMMs 1 and 4, 13 and 16, 9 and 12, 21 and 24, 2 and 5, and 14 and 17, 8 and 111 | DIMMs 1 and 4, 13 and 16, 33 and 36, 45 and 48, 9 and 12, 21 and 24, 25 and 281 | |
8 | DIMMs 1 and 4, 13 and 16, 9 and 12, 21 and 24, 2 and 5, and 14 and 17, 8 and 11, 20 and 231 | DIMMs 1 and 4, 13 and 16, 33 and 36, 45 and 48, 9 and 12, 21 and 24, 25 and 28, 37 and 401 | |
9 | DIMMs 1 and 4, 13 and 16, 9 and 12, 21 and 24, 2 and 5, and 14 and 17, 8 and 11, 20 and 23, 3 and 61 | DIMMs 1 and 4, 13 and 16, 33 and 36, 45 and 48, 9 and 12, 21 and 24, 25 and 28, 37 and 40, 2 and 51 | |
10 | DIMMs 1 and 4, 13 and 16, 9 and 12, 21 and 24, 2 and 5, and 14 and 17, 8 and 11, 20 and 23, 3 and 6, 15 and 181 | DIMMs 1 and 4, 13 and 16, 33 and 36, 45 and 48, 9 and 12, 21 and 24, 25 and 28, 37 and 40, 2 and 5, 14 and 171 | |
11 | DIMMs 1 and 4, 13 and 16, 9 and 12, 21 and 24, 2 and 5, and 14 and 17, 8 and 11, 20 and 23, 3 and 6, 15 and 18, 7 and 101 | DIMMs 1 and 4, 13 and 16, 33 and 36, 45 and 48, 9 and 12, 21 and 24, 25 and 28, 37 and 40, 2 and 5, 14 and 17, 32 and 351 | |
12 | DIMMs 1 and 4, 13 and 16, 9 and 12, 21 and 24, 2 and 5, and 14 and 17, 8 and 11, 20 and 23, 3 and 6, 15 and 18, 7 and 10, 19 and 221 | DIMMs 1 and 4, 13 and 16, 33 and 36, 45 and 48, 9 and 12, 21 and 24, 25 and 28, 37 and 40, 2 and 5, 14 and 17, 32 and 35, 44 and 471 | |
13 | DIMMs 1 and 4, 13 and 16, 33 and 36, 45 and 48, 9 and 12, 21 and 24, 25 and 28, 37 and 40, 2 and 5, 14 and 17, 32 and 35, 44 and 47, 8 and 111 | ||
14 | DIMMs 1 and 4, 13 and 16, 33 and 36, 45 and 48, 9 and 12, 21 and 24, 25 and 28, 37 and 40, 2 and 5, 14 and 17, 32 and 35, 44 and 47, 8 and 11, 20 and 231 | ||
15 | DIMMs 1 and 4, 13 and 16, 33 and 36, 45 and 48, 9 and 12, 21 and 24, 25 and 28, 37 and 40, 2 and 5, 14 and 17, 32 and 35, 44 and 47, 8 and 11, 20 and 23, 26 and 291 | ||
16 | DIMMs 1 and 4, 13 and 16, 33 and 36, 45 and 48, 9 and 12, 21 and 24, 25 and 28, 37 and 40, 2 and 5, 14 and 17, 32 and 35, 44 and 47, 8 and 11, 20 and 23, 26 and 29, 38 and 411 | ||
17 | DIMMs 1 and 4, 13 and 16, 33 and 36, 45 and 48, 9 and 12, 21 and 24, 25 and 28, 37 and 40, 2 and 5, 14 and 17, 32 and 35, 44 and 47, 8 and 11, 20 and 23, 26 and 29, 38 and 41, 3 and 61 | ||
18 | DIMMs 1 and 4, 13 and 16, 33 and 36, 45 and 48, 9 and 12, 21 and 24, 25 and 28, 37 and 40, 2 and 5, 14 and 17, 32 and 35, 44 and 47, 8 and 11, 20 and 23, 26 and 29, 38 and 41, 3 and 6, 15 and 181 | ||
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To install a DIMM, complete the following steps:
- Install the cover onto the compute node (see Installing the compute node cover for instructions).
- Install the compute node into the chassis (see Installing a compute node in a chassis for instructions).