IBM 7380E1U, Installation And User Manual

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9. Turn the DIMM so that the DIMM keys align correctly with the connector.
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 (see “Installing the air baffle” on page 61 for more
information).
12. Reinstall the power-supply cage.
13. Reinstall the left-side cover (see “Completing the installation” on page 105).
14. Reinstall the power supplies.
15. Reconnect the power cords and external cables.
If you have other devices to install or remove, do so now. Otherwise, go to
“Completing the installation” on page 105.
Memory sparing
The server supports memory sparing. This feature disables the failed memory from
the system configuration and activates a DIMM to replace the failed active DIMM.
You can enable either memory sparing or memory mirroring in the Setup utility (see
“Using the Setup utility” on page 108). When you use the memory sparing feature,
consider the following information:
v The memory sparing feature is supported on server models with an Intel Xeon
™
5600 series microprocessor.
v
When you enable the memory sparing feature, you must install three DIMMs per
microprocessor at a time. The first DIMM must be in channel 0, the second
DIMM in channel 1, and the spare DIMM in channel 2. The DIMMs must be
identical in size, type, rank, and organization, but not in speed. The channels run
at the speed of the slowest DIMM in any of the channels.
v
The maximum available memory is reduced to 2/3 of the installed memory when
memory sparing mode is enabled. For example, if you install 72 GB of memory
using RDIMMs, only 48 GB of addressable memory is available when you use
memory sparing.
The following table shows the installation sequence for installing DIMMs for each
microprocessor and the sparing DIMM in memory online-spare mode:
Chapter 2. Installing optional devices
93