IBM System x3800 Type 8865 User Manual page 48

v There are two memory power buses, which are split between the four memory
v If a problem with a DIMM is detected, light path diagnostics will light the
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IBM System x3800 Type 8865: User's Guide
Table 4. Alternate memory card installation sequence
Installation order
First
Second
Third
Fourth
Table 5. Memory card installation sequence for memory-mirrored configuration
Installation order
First
Second
Third
Fourth
cards. Memory cards 1 and 2 are on power bus 1, and memory cards 3 and 4
are on power bus 2. If memory mirroring is enabled, you can hot-replace one
memory card at a time on each memory power bus.
system-error LED on the front of the server, indicating that there is a problem
and guide you to the defective DIMM. When this occurs, first identify the
defective DIMM; then, remove and replace the DIMM.
The following illustration shows the LEDs on the memory card.
Error
Memory Hot-Swap Enabled
Memory Hot-Swap Enabled LED: When this LED is lit, it indicates that
hot-swap memory is enabled.
Error LED: When this LED is lit, it indicates that a memory card or DIMM has
failed.
Memory Port Power LED: When this LED is off, it indicates that power is
removed from the port and that you can remove the memory card and replace a
failed DIMM. This LED also turns off when the release levers are opened.
Memory card
1
3
2
4
Memory card
1
3
2
4
1
3
2
4
Memory Port Power
DIMM pair
1 and 3
2 and 4
1 and 3
2 and 4
1 and 3
2 and 4
1 and 3
2 and 4
DIMM pair
1 and 3
1 and 3
1 and 3
1 and 3
2 and 4
2 and 4
2 and 4
2 and 4