User`s guide

9-85
Online Spare Memory
The online memory spare feature puts a group of memory devices within a memory branch into standby status as spare
devices. If an unrecoverable error occurs in a DIMM of the running group, the feature automatically changes the
running DIMM from the failed one to a DIMM in the standby group to continue the processing.
NOTE: The operating system recognizes the memory devices as those with capacities less
than the actual physical capacities. (The recognized capacities vary depending on the
number of DIMMs and on the physical capacity per DIMM.)
Motherboard
Memory controller
Branch #0
Group #1
Branch #1
In operation
Standby
Group #3
Group #5
Group #2
Group #4
Group #6