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To hot-swap a failed DIMM:
1. Verify that memory mirroring and hot-swap are enabled by checking the
memory hot-swap enabled LED on the memory cards.
When a DIMM fails, you are alerted with the memory LED on the light path
diagnostics panel and by other means with the service processor, if this has
been configured.
2. Locate the memory card that has the failed DIMM by identifying which
memory card has the lit memory error LED.
3. Remove the memory card containing the failed DIMM.
4. Press the button on the memory card to identify which DIMM has failed. The
LED next to the failed DIMMs light up.
5. Replace the failed DIMM and reinsert the memory card.
For details about hot-swapping memory correctly and which sequence to follow,
see IBM: System x3850 M2 and System x3950 M2 User's Guide:
http://www.ibm.com/support/docview.wss?uid=psg1MIGR-5073029
3.2.5 Hot-add memory
The hot-add memory feature enables you to add DIMMs without turning off the
server. This setting can be changed as described in 3.2.6, "Memory configuration
in BIOS" on page 121.
Requirements for enabling the hot-add memory feature on the server are:
The operating system must support the adding of usable system memory to a
running operating system. This is done with an ACPI sequence.
Currently, the only operating systems that have this capability and support on
the x3850 M2 and x3950 M2 are Windows Server 2003 and Windows Server
2008, both Enterprise Edition and Datacenter Edition.
Memory hot-add must be specifically enabled in the BIOS setup. When this is
done, the system allocates blank windows of memory space for future
memory additions. By enabling hot-add, memory mirroring will automatically
be disabled.
Memory cards 2 and 4 must not be installed because these are the
that can be hot-added.
If only one memory card, memory card 1, is installed prior to the hot-add
operation, then
If two memory cards are installed in slots 1 and 3, then two additional memory
cards can be added in slots 2 and 4.
120
Planning, Installing, and Managing the IBM System x3950 M2
only
one more memory card may be added in slot 2.
only
cards
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