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
Table
4
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
68
for
the
memory
branch
structure.
DIMM
ranks
are
online-spared
if
the
DIMMs
are
installed
according
to
the
rules
in
Table
6
on
page
71
or
Table
7
on
page
71.
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
Table
6
on
page
71
and
Table
7
on
page
71
for
the
online-spare
DIMM
connector
assignments.
Important:
Table
6
on
page
71
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
Table
7
on
page
71,
instead.
70
System
x3650
Type
7979:
User’s
Guide
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