Online-spare memory, Online-spare, Memory – Lenovo RD120 User Manual
Page 77
When
you
use
memory
mirroring,
you
must
install
two
pairs
of
DIMMs
at
a
time.
The
four
DIMMs
in
each
group
must
be
identical.
See
for
the
DIMM
connectors
that
are
in
each
group.
Table
4.
Memory
mirroring
DIMM
installation
sequence
Group
DIMM
connectors
1
1,
4,
7,
and
10
2
2,
5,
8,
and
11
3
3,
6,
9,
and
12
Table
5.
Memory
mirroring
DIMM
functions
Group
Active
DIMMs
Mirroring
DIMMs
1
1,
4
7,
10
2
2,
5
8,
11
3
3,
6
9,
12
Online-spare
memory
The
server
supports
online-spare
memory.
This
feature
disables
the
failed
memory
from
the
system
configuration
and
activates
an
online-spare
pair
of
DIMMs
to
replace
the
failed
active
DIMM
pair.
Online-spare
memory
reduces
the
amount
of
available
memory.
Before
you
can
enable
this
feature,
you
must
install
up
to
two
additional
pairs
of
DIMMs.
The
online-spare
DIMM
pairs
must
be
the
same
speed,
type,
and
the
same
size
as,
or
larger
than,
the
largest
active
DIMM
pairs.
Enable
online-spare
memory
through
the
Configuration/Setup
Utility
program.
The
BIOS
code
assigns
the
online-spare
DIMM
pairs
according
to
your
DIMM
configuration.
Online-sparing
is
enabled
on
a
memory
branch
basis;
the
BIOS
code
does
not
enable
online-sparing
on
a
branch
that
cannot
support
online-sparing.
See
the
illustration
on
page
for
the
memory
branch
structure.
DIMM
ranks
are
online-spared
if
the
DIMMs
are
installed
according
to
the
rules
in
or
Note:
POST
gives
a
warning
message
when
online-sparing
cannot
be
enabled
on
both
branches.
However,
no
warning
message
is
given
when
online-sparing
is
enabled
on
one
branch
and
disabled
on
the
other.
Online-spare
configurations
are
supported
for
each
branch.
See
and
for
the
online-spare
DIMM
connector
assignments.
Important:
shows
the
basic
DIMM
online-spare
scheme.
If
the
BIOS
code
level
is
version
1.04
or
later,
you
can
install
the
DIMMs
according
to
the
alternative
scheme,
shown
in
instead.
Chapter
2.
Installing
optional
devices
63