Independent Channel Mode; Memory Mirroring Mode - Lenovo ThinkServer TD200x Hardware Maintenance Manual

1
DIMM
2
Retaining clip
10. Insert the DIMM into the connector by aligning the edges of the DIMM with the slots at the ends of the
DIMM connector. Firmly press the DIMM straight down into the connector by applying pressure on both
ends of the DIMM simultaneously. The retaining clips snap into the locked position when the DIMM is
firmly seated in the connector. If there is a gap between the DIMM and the retaining clips, the DIMM has
not been correctly inserted; open the retaining clips, remove the DIMM, and then reinsert it.
11. Reinstall the air baffle (Installing the air baffle).
12. Reinstall the power-supply cage (Installing a hot-swap power supply).
13. Reinstall the left-side cover (Installing the left-side cover).
14. Reinstall the power supplies (Installing a hot-swap power supply).
15. Reconnect the power cords and external cables.
If you have other optional devices to install or remove, do so now. Otherwise, go to Completing the
installation .

Independent channel mode

The server requires at least one installed DIMM per microprocessor. The server comes with a minimum of
two 1 GB DIMMs, installed in connectors 3 and 6. Connector 3 (in channel 0) and connector 6 (in channel
1) are the farthest connectors from microprocessor 1 in those channels. When you install additional
DIMMs, install them in the order shown in DIMM installation sequence for independent channel mode , to
maintain server performance.
Note: If you have configured the server to use memory mirroring, do not use the order shown in this table;
go to Memory-mirroring mode DIMM population sequence and use the installation order shown there.
Table 11. DIMM installation sequence for independent channel mode
Installed microprocessors
Microprocessor 1
Microprocessor 2

Memory mirroring mode

Memory-mirroring mode replicates and stores data on two pairs of DIMMs within two channels
simultaneously. If a failure occurs, the memory controller switches from the primary pair of memory DIMMs
to the backup pair of DIMMs. You must enable memory mirroring through the Setup Utility. For details about
202
ThinkServer TD200x Hardware Maintenance Manual
DIMM connector population sequence
3, 6, 8, 2, 5, 7, 1, 4
11, 14, 16, 10, 13, 15, 9, 12