Table
4.
Alternate
memory
card
installation
sequence
(continued)
Memory
card
order
Memory
card
DIMM
pair
Fourth
4
1
and
3
2
and
4
Table
5.
Memory
card
installation
sequence
for
memory-mirrored
configuration
Memory
card
order
Memory
card
DIMM
pair
First
1
1
and
3
3
1
and
3
Second
2
1
and
3
4
1
and
3
Third
1
2
and
4
3
2
and
4
Fourth
2
2
and
4
4
2
and
4
v
There
are
two
memory
power
buses
split
between
the
four
memory
cards.
Memory
cards
1
and
2
are
on
power
bus
1,
and
memory
cards
3
and
4
are
on
power
bus
2.
If
memory
mirroring
is
enabled,
you
can
hot-replace
one
memory
card
at
a
time
on
each
memory
power
bus.
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
guide
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
on
the
memory
card:
Memory Hot-Swap Enabled
Memory Port Power
Error
Memory
Hot-Swap
Enabled
LED:
When
this
LED
is
lit,
it
indicates
that
hot-swap
memory
is
enabled.
Error
LED:
When
this
LED
is
lit,
it
indicates
that
a
memory
card
or
DIMM
has
failed.
Memory
Port
Power
LED:
When
this
LED
is
off,
it
indicates
that
power
is
removed
from
the
port
and
that
you
can
remove
the
memory
card
and
replace
a
failed
DIMM.
This
LED
will
also
turn
off
when
the
release
levers
are
opened.
Note:
Add
odd
numbered
DIMMs
to
each
available
memory
card
first,
then
add
the
even
numbered
pairs.
Active
Memory
Active
Memory
is
an
IBM
technology
that
improves
the
reliability
of
the
DIMMs
through
the
memory
mirroring,
memory
scrubbing,
and
Memory
ProteXion
™
features.
Chapter
2.
Installing
options
33
Summary of Contents for 88743RU - System x3950 E
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