Lenovo 6445, 6447, 6446, 6444 manual

vThe server supports online-spare memory. This feature disables the failed memory from the system configuration and activates an online-spare pair of DIMMs to replace the failed active DIMM pair. See “Online-sparememory” on page 14 for more information about online-spare memory and the DIMM configuration that is required.

vYou can enable either online-spare memory or memory mirroring, but not both at the same time. Online-spare memory provides more memory capacity than mirroring; mirroring provides better memory protection but less memory capacity than online-spare memory.

vWhen you install or remove DIMMs, the server configuration information changes. When you restart the server, the system displays a message that indicates that the memory configuration has changed.

To install a DIMM, complete the following steps:

1.Read the safety information that begins on page v and “Installationguidelines” on page 7.

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.

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

12ThinkServer RD120 Types 6444, 6445, 6446, and 6447: Installation Guide