Active Memory - IBM 88723RU User Manual

v There are two memory power buses split between the four memory cards.
v If a problem with a DIMM is detected, light path diagnostics will light the

Active Memory

Active Memory is an IBM technology that improves the reliability of the DIMMs
through the memory mirroring, memory scrubbing, and Memory ProteXion
features.
Table 4. Alternate memory card installation sequence (continued)
Memory card order
Fourth
Table 5. Memory card installation sequence for memory-mirrored configuration
Memory card order
First
Second
Third
Fourth
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 will also turn off when the release levers are opened.
Note: Add odd numbered DIMMs to each available memory card first, then add
the even numbered pairs.
Memory card
4
Memory card
1
3
2
4
1
3
2
4
Memory Port Power
DIMM pair
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
™
Chapter 2. Installing options
33