User`s guide

9-82
Using the Memory RAS Features
The server features the memory mirroring and online spare memory as well as the chipkill ECC memory, which can
automatically correct a memory error (multi-bit error) causing system shutdown.
IMPORTANT: The memory mirroring and online spare memory features are not available
in the normal memory configuration. (The chipkill ECC memory feature can operate in any
configuration.)
The memory area on the motherboard of the server is divided into two memory branches as shown in the figure below.
The memory mirroring and online spare memory features keep memory redundancy between memory branches and
within a memory branch by monitoring or altering memory active/inactive status, respectively.
Motherboard
Memory controller
Memory branch #0 Memory branch #1
Group #1
Group #3
Group #5
Group #2
Group #4
Group #6
#11
#21
#31
#41
#12
#22
#32
#42
#13
#23
#33
#43