IBM 8840 Hardware Maintenance Manual - Page 50

connectors, Group, Active, Online-spare, memory

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Table 3. DIMM installation sequence Pair DIMM connectors 1 1 and 2 2 3 and 4 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 4 for the DIMM connectors that are in each group. Table 4. 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 5 for the online-spare memory DIMM connector assignments. Table 5. Online-spare memory DIMM connector assignments Active DIMM connectors Online-spare memory DIMM connectors 1 and 2 3 and 4 40 xSeries 346 Types 8840 and 1880: Hardware Maintenance Manual and Troubleshooting Guide

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Table
3.
DIMM
installation
sequence
Pair
DIMM
connectors
1
1
and
2
2
3
and
4
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
4
for
the
DIMM
connectors
that
are
in
each
group.
Table
4.
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
5
for
the
online-spare
memory
DIMM
connector
assignments.
Table
5.
Online-spare
memory
DIMM
connector
assignments
Active
DIMM
connectors
Online-spare
memory
DIMM
connectors
1
and
2
3
and
4
40
xSeries
346
Types
8840
and
1880:
Hardware
Maintenance
Manual
and
Troubleshooting
Guide