User's Manual

84 omconfig: Managing Components Using the Instrumentation Service
when you disable redundancy, you instruct the system not to switch to other
available memory modules when the module the system is using begins to
encounter errors. To enable redundancy, choose among spare, mirror, and RAID.
Spare mode disables a bank of system memory in which a correctable memory
event is detected, enables the spare bank, and copies all the data from the
original bank to the spare bank. Spare bank requires at least three banks of
identical memory; the operating system does not recognize the spare bank.
Mirror mode switches to a redundant copy of memory when an uncorrectable
memory event is detected. After switching to the mirrored memory, the
system does not switch back to the original system memory until the next
reboot. The operating system does not recognize half of the installed system
memory in this mode.
RAID mode provides an extra level of memory checking and error recovery at
the expense of some memory capacity.