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 16 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 9.
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 IBM 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 server cover.
Attention: To avoid breaking the retaining clips or damaging the DIMM
connectors, open, and close the clips gently.
14 IBM System x3650 Type 7979: Installation Guide
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