IBM 72335LU User Guide - Page 49

installation, order, Memory, Connector, numbers

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Table 7. Memory-card installation sequence for memory-mirroring configuration DIMM pair installation order Memory card Connector numbers First 1 1 and 5 2 1 and 5 Second 3 1 and 5 4 1 and 5 Third 1 2 and 6 2 2 and 6 Fourth 3 2 and 6 4 2 and 6 Fifth 1 3 and 7 2 3 and 7 Sixth 3 3 and 7 4 3 and 7 Seventh 1 4 and 8 2 4 and 8 Eighth 3 4 and 8 4 4 and 8 v There are four memory power buses, which are split among the four memory cards. v For memory mirroring, you must install DIMMs in sets of four, one pair in each memory card. All DIMMs in each set must be the same size and type. Memory cards 1 and 2 mirror each other, and memory cards 3 and 4 mirror each other. v If a problem with a DIMM is detected, light path diagnostics will light the system-error LED on the front of the server, indicating that there is a problem and guiding you to the defective DIMM. When this occurs, first identify the defective DIMM; then, remove and replace the DIMM. The following illustration shows the LEDs that are visible on top of the memory card. Chapter 2. Installing optional devices 37

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Table
7.
Memory-card
installation
sequence
for
memory-mirroring
configuration
DIMM
pair
installation
order
Memory
card
Connector
numbers
First
1
1
and
5
2
1
and
5
Second
3
1
and
5
4
1
and
5
Third
1
2
and
6
2
2
and
6
Fourth
3
2
and
6
4
2
and
6
Fifth
1
3
and
7
2
3
and
7
Sixth
3
3
and
7
4
3
and
7
Seventh
1
4
and
8
2
4
and
8
Eighth
3
4
and
8
4
4
and
8
v
There
are
four
memory
power
buses,
which
are
split
among
the
four
memory
cards.
v
For
memory
mirroring,
you
must
install
DIMMs
in
sets
of
four,
one
pair
in
each
memory
card.
All
DIMMs
in
each
set
must
be
the
same
size
and
type.
Memory
cards
1
and
2
mirror
each
other,
and
memory
cards
3
and
4
mirror
each
other.
v
If
a
problem
with
a
DIMM
is
detected,
light
path
diagnostics
will
light
the
system-error
LED
on
the
front
of
the
server,
indicating
that
there
is
a
problem
and
guiding
you
to
the
defective
DIMM.
When
this
occurs,
first
identify
the
defective
DIMM;
then,
remove
and
replace
the
DIMM.
The
following
illustration
shows
the
LEDs
that
are
visible
on
top
of
the
memory
card.
Chapter
2.
Installing
optional
devices
37