IBM eServer xSeries 445 Type 8870 Option Installation Manual page 54

v Memory ProteXion: This feature reassigns memory bits to new locations within
Enabling or disabling memory mirroring: Complete the following steps to
enable or disable memory mirroring.
Note: For memory mirroring to work, you must have DIMMs of the same size and
1. Check your operating system documentation to make sure that it supports
2. Install DIMMs of the same size and clock speed in the two memory ports.
3. Enable memory mirroring in the Configuration/Setup Utility program:
Removing and replacing DIMMs
Complete the following steps to remove and replace a DIMM in the SMP Expansion
Module with the server turned off.
Attention:
one or both of the SMP Expansion Modules. See "Hot-replace DIMMs" on page 44
for information on how to hot-replace DIMMs with the server turned on.
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xSeries 445 Type 8870: Option Installation Guide
was stored in the damaged locations is rewritten to a new location. The error is
then reported so that preventive maintenance can be performed. Provided that
there are enough good locations to enable the correct operation of the server, no
further action is taken other than recording the error in the error logs.
If the error is not recoverable, memory scrubbing sends an error message to the
light path diagnostics feature, which then lights the applicable LEDs to guide you
to the damaged DIMM. If memory mirroring is enabled, the mirrored copy of the
data in the mirrored DIMM is used to refresh the new DIMM after it is installed.
memory when recoverable errors have been detected.
When a recoverable error is found by memory scrubbing, the Memory ProteXion
feature writes the data that was to be stored in the damaged memory locations to
spare memory locations within the same DIMM.
clock speed in both memory ports.
memory mirroring.
a. Turn on the server and watch the monitor screen.
b. When the message Press F1 for Configuration/Setup appears, press F1.
c. From the Configuration/Setup Utility main menu, select Advanced Setup.
d. Select Memory Settings.
e. Select Memory Mirroring Settings.
f. Enable or Disable the SMP Module memory mirroring setting from within
this window.
g. Save and exit the Configuration/Setup Utility program.
When working with DIMMs or other options, you might need to remove
1. Read the safety information beginning on page v and "Installation guidelines"
on page 11.
2. Turn off the server and peripheral devices; then, disconnect the power cords
and all external cables from the SMP Expansion Module.
3. Pull out on the quick release latches on each side of the server; then, pull the
server out of its rack enclosure until it stops.
4. Open the top cover.
5. If necessary, remove the top SMP Expansion Module or SMP baffle from the
server. See "Removing the SMP Expansion Module and cover" on page 32 for
instructions.
6. Open the DIMM access door that covers the DIMM you will be removing.