IBM 8863 Service Guide - Page 125

Memory, Hot-Swap, Enabled, Error, Power

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Table 5. Memory card installation sequence for cost-sensitive configuration (continued) Memory card order Memory card DIMM pair Second 3 1 and 3 2 and 4 Third 2 1 and 3 2 and 4 Fourth 4 1 and 3 2 and 4 Table 6. 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 Port Power Error Memory Hot-Swap Enabled 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. Chapter 4. Removing and replacing server components 109

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Table
5.
Memory
card
installation
sequence
for
cost-sensitive
configuration
(continued)
Memory
card
order
Memory
card
DIMM
pair
Second
3
1
and
3
2
and
4
Third
2
1
and
3
2
and
4
Fourth
4
1
and
3
2
and
4
Table
6.
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.
Chapter
4.
Removing
and
replacing
server
components
109