Lenovo RD120 manual Memory mirroring

To install a DIMM, complete the following steps.

1.Read the safety information that begins on page v and “Installation guidelines” on page 29.

2.Turn off the server and peripheral devices, and disconnect the power cord and all external cables.

Attention: In a dc power environment, only trained service personnel other than Lenovo service technicians are authorized to connect or disconnect power to the dc power supply. See the documentation that comes with each dc power supply.

3.Remove the cover (see “Removing the cover” on page 31).

Attention: To avoid breaking the retaining clips or damaging the DIMM connectors, open and close the clips gently.

4.Remove the riser-card assembly (see “Removing the riser-card assembly” on page 32).

5.Remove the DIMM air baffle (see “Removing the DIMM air baffle” on page 37).

6.Open the retaining clip on each end of the DIMM connector.

7.Touch the static-protective package that contains the DIMM to any unpainted metal surface on the server. Then, remove the DIMM from the package.

8.Turn the DIMM so that the DIMM keys align correctly with the connector.

9.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.

Important: 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.

If you have other optional devices to install or remove, do so now. Otherwise, go to “Completing the installation” on page 74.

Memory mirroring

You can configure the server to use memory mirroring. Memory mirroring stores data in two pairs of DIMMs simultaneously. If a failure occurs, the memory controller switches from the active pair to the mirroring pair. Memory mirroring reduces the amount of available memory. Enable memory mirroring through the Configuration/Setup Utility program. See “Configuration/Setup Utility menu choices” on page 80 for details about enabling memory mirroring.

62ThinkServer RD120 Types 6444, 6445, 6446, and 6447: User Guide