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Table 15. Microprocessor 2 memory-mirroring DIMM installation sequence
Microprocessor
number
Pair
2
1
2
2
2
3
– To support memory mirroring, the DIMMs in each pair must match but the
pairs can be different from each other. For example, the first pair of DIMMs
must match and the second pair of DIMMs must match; however, the first and
second pair of DIMMs can be different from each other.
– Channel 2 DIMM connectors are not used in memory-mirroring mode.
– The maximum available memory is reduced by half when memory mirroring is
enabled. For example, if you install 64 GB of memory, only 32 GB of
addressable memory is available when you use memory mirroring.
v When you install or remove DIMMs, the system-board tray configuration
information changes. When you restart the system-board tray, the system
displays a message that indicates that the memory configuration has changed.
To install a DIMM, complete the following steps.
DIMM
Retaining
clip
1. Read the documentation that comes with the DIMM.
2. Touch the static-protective package that contains the DIMM to any unpainted
metal surface on the outside of the system-board tray; then, remove the DIMM
from the package.
Attention:
To avoid breaking the DIMM retaining clips or damaging the DIMM
connectors, open and close the clips gently.
3. Make sure that both of the retaining clips are in the fully open position.
4. Orient the DIMM so that the DIMM keys align correctly with the connector on
the system board.
5. 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.
Attention:
If there is a gap between the DIMM and the retaining clips, the
DIMM has not been correctly installed. In this case, open the retaining clips and
remove the DIMM; then, reinsert the DIMM.
6. Install the expansion enclosure, if you removed one (see "Installing an
expansion enclosure on a system-board tray" on page 132); otherwise, install
the system-board tray cover (see "Installing the system-board tray cover" on
page 125).
DIMM connectors
11, 14
10, 13
9, 12
Chapter 5. Removing and replacing server components
167
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