IBM 6380, User Manual

Page: 57 / 96

Table 5. Microprocessor 2 memory-mirroring DIMM installation sequence
Microprocessor
number
Pair DIMM connectors
2 1 11, 14
2 2 10, 13
2 3 9, 12
– 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:
1. Read the safety information that begins on page vii and “Installation guidelines”
on page 23.
2. Read the documentation that comes with the DIMM.
3. Turn off the system-board tray and all attached devices (see “Turning off the
system-board tray” on page 21).
4. If the system-board tray is installed in a chassis, remove it (see “Removing a
system-board tray from a 2U chassis” on page 25 or “Removing a
system-board tray from a 3U chassis” on page 27).
5. If an expansion enclosure is installed on the system-board tray, remove it (see
“Removing an expansion enclosure” on page 29); otherwise, remove the
system-board tray cover (see “Removing the system-board tray cover” on page
28).
6. Locate the DIMM connectors (see “System-board connectors” on page 13).
Determine the connectors into which you will install the DIMMs.
Chapter 3. Installing optional devices
43