–
Online-spare
memory
disables
a
failed
rank
pair
of
DIMMs
from
the
system
configuration
and
activates
an
online-spare
rank
pair
of
DIMMs
to
replace
the
failed
rank
pair
of
DIMMs.
For
an
online-spare
pair
of
DIMMs
to
be
activated,
you
must
enable
this
feature
and
have
installed
an
additional
rank
pair
of
DIMMs
of
the
same
speed,
type,
size
(or
larger),
and
technology
as
the
failed
pair
of
DIMMs.
You
must
enable
the
feature
through
the
Configuration/Setup
Utility
program.
To
enable
online-spare
memory
in
the
Configuration/Setup
Utility
program,
select
Devices
and
I/O
Ports
→
Advanced
Chipset
Control
→
Memory
Branch
Mode
.
Use
the
arrow
keys
to
change
the
setting
for
Branch
0
Rank
Sparing
or
Branch
1
Rank
Sparing
to
Enabled
;
then,
save
your
changes.
For
more
information,
see
the
section
about
configuring
the
server
in
the
User’s
Guide
on
the
IBM
System
x
Documentation
CD.
When
you
use
online-spare
memory,
you
must
consider
the
following
information:
-
You
cannot
enable
online-spare
memory
while
the
server
is
operating
in
mirroring
mode.
-
When
using
online-spare
memory
the
two
memory
branches
operate
independently
of
each
other.
You
can
enable
online-spare
memory
for
one
or
both
branches.
-
Online-spare
memory
reduces
the
amount
of
available
memory.
-
The
BIOS
code
assigns
the
online-spare
DIMM
pairs
according
to
your
DIMM
configuration.
-
Online-spare
memory
works
by
copying
information
from
a
failed
DIMM
rank
to
another
good
DIMM
rank
within
the
same
memory
branch.
-
Online-spare
memory
can
not
copy
information
from
one
branch
to
the
other.
Chapter
2.
Installing
optional
devices
13
Summary of Contents for x3500 - System - 7977
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