Table
2.
DIMM
installation
sequence
(continued)
Pair
DIMM
connectors
3
5
and
6
4
7
and
8
v
Each
DIMM
in
a
pair
must
be
the
same
size
and
technology
to
ensure
that
the
server
will
operate
properly.
v
You
can
configure
the
server
to
use
memory
mirroring.
Memory
mirroring
stores
data
in
two
pairs
of
DIMMs
simultaneously.
Memory
mirroring
reduces
the
amount
of
available
memory.
Enable
memory
mirroring
through
the
Configuration/Setup
Utility
program.
See
the
User’s
Guide
on
the
IBM
xSeries
Documentation
CD
for
details
about
enabling
memory
mirroring.
When
using
memory
mirroring,
you
must
install
two
pairs
of
DIMMs
at
a
time.
The
four
DIMMs
in
each
group
must
be
identical.
See
Table
3
for
the
DIMM
connectors
that
are
in
each
group.
Table
3.
Memory
mirroring
DIMM
installation
sequence
Group
DIMM
connectors
1
1,
2,
3,
and
4
2
5,
6,
7,
and
8
v
The
server
supports
online-spare
memory.
This
feature
disables
the
failed
memory
from
the
system
configuration
and
activates
an
online-spare
memory
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
one
additional
pair
of
DIMMs.
The
online-spare
memory
DIMM
pair
must
be
the
same
speed,
type,
and
the
same
size,
or
larger,
than
the
active
DIMM
pair.
Enable
online-spare
memory
through
the
Configuration/Setup
Utility
program.
The
BIOS
code
assigns
the
online-spare
memory
DIMM
pair
according
to
your
DIMM
configuration.
See
the
User’s
Guide
on
the
IBM
xSeries
Documentation
CD
for
information
about
enabling
online-spare
memory.
See
Table
4
for
the
online-spare
memory
DIMM
connector
assignments.
Table
4.
Online-spare
memory
DIMM
connector
assignments
Active
DIMM
connectors
Online-spare
memory
DIMM
connectors
1
and
2
3
and
4
1
and
2
3
and
4
5
and
6
Chapter
2.
Installing
options
15
Summary of Contents for 8840 - eServer xSeries 346
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