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v The 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-spare memory” on
page 14 for more information about online-spare memory and the DIMM
configuration that is required.
v You 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.
v When 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 “Installation guidelines”
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.
12 ThinkServer RD120 Types 6444, 6445, 6446, and 6447: Installation Guide