IBM 7979B1U User Manual - Page 85

Memory, mirroring

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To install a DIMM, complete the following steps. 1. Read the safety information that begins on page vii and "Installation guidelines" on page 28. 2. Turn off the server and peripheral devices, and disconnect the power cord and all external cables. Attention: In a dc power environment, only trained service personnel other than IBM service technicians are authorized to connect or disconnect power to the dc power supply. See the documentation that comes with each dc power supply. 3. Remove the cover (see "Removing the cover" on page 31). Attention: To avoid breaking the retaining clips or damaging the DIMM connectors, open and close the clips gently. 4. Remove the riser-card assembly (see "Removing the riser-card assembly" on page 32). 5. Remove the DIMM air baffle (see "Removing the DIMM air baffle" on page 36). 6. Open the retaining clip on each end of the DIMM connector. 7. Touch the static-protective package that contains the DIMM to any unpainted metal surface on the server. Then, remove the DIMM from the package. 8. Turn the DIMM so that the DIMM keys align correctly with the connector. 9. Insert the DIMM into the connector by aligning the edges of the DIMM with the slots at the ends of the DIMM connector. Firmly press the DIMM straight down into the connector by applying pressure on both ends of the DIMM simultaneously. The retaining clips snap into the locked position when the DIMM is firmly seated in the connector. Important: If there is a gap between the DIMM and the retaining clips, the DIMM has not been correctly inserted; open the retaining clips, remove the DIMM, and then reinsert it. If you have other optional devices to install or remove, do so now. Otherwise, go to "Completing the installation" on page 81. Memory mirroring You can configure the server to use memory mirroring. Memory mirroring stores data in two pairs of DIMMs simultaneously. If a failure occurs, the memory controller switches from the active pair to the mirroring pair. Memory mirroring reduces the amount of available memory. Enable memory mirroring through the Configuration/Setup Utility program. See "Configuration/Setup Utility menu choices" on page 86 for details about enabling memory mirroring. Chapter 2. Installing optional devices 69

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To
install
a
DIMM,
complete
the
following
steps.
1.
Read
the
safety
information
that
begins
on
page
vii
and
“Installation
guidelines”
on
page
28.
2.
Turn
off
the
server
and
peripheral
devices,
and
disconnect
the
power
cord
and
all
external
cables.
Attention:
In
a
dc
power
environment,
only
trained
service
personnel
other
than
IBM
service
technicians
are
authorized
to
connect
or
disconnect
power
to
the
dc
power
supply.
See
the
documentation
that
comes
with
each
dc
power
supply.
3.
Remove
the
cover
(see
“Removing
the
cover”
on
page
31).
Attention:
To
avoid
breaking
the
retaining
clips
or
damaging
the
DIMM
connectors,
open
and
close
the
clips
gently.
4.
Remove
the
riser-card
assembly
(see
“Removing
the
riser-card
assembly”
on
page
32).
5.
Remove
the
DIMM
air
baffle
(see
“Removing
the
DIMM
air
baffle”
on
page
36).
6.
Open
the
retaining
clip
on
each
end
of
the
DIMM
connector.
7.
Touch
the
static-protective
package
that
contains
the
DIMM
to
any
unpainted
metal
surface
on
the
server.
Then,
remove
the
DIMM
from
the
package.
8.
Turn
the
DIMM
so
that
the
DIMM
keys
align
correctly
with
the
connector.
9.
Insert
the
DIMM
into
the
connector
by
aligning
the
edges
of
the
DIMM
with
the
slots
at
the
ends
of
the
DIMM
connector.
Firmly
press
the
DIMM
straight
down
into
the
connector
by
applying
pressure
on
both
ends
of
the
DIMM
simultaneously.
The
retaining
clips
snap
into
the
locked
position
when
the
DIMM
is
firmly
seated
in
the
connector.
Important:
If
there
is
a
gap
between
the
DIMM
and
the
retaining
clips,
the
DIMM
has
not
been
correctly
inserted;
open
the
retaining
clips,
remove
the
DIMM,
and
then
reinsert
it.
If
you
have
other
optional
devices
to
install
or
remove,
do
so
now.
Otherwise,
go
to
“Completing
the
installation”
on
page
81.
Memory
mirroring
You
can
configure
the
server
to
use
memory
mirroring.
Memory
mirroring
stores
data
in
two
pairs
of
DIMMs
simultaneously.
If
a
failure
occurs,
the
memory
controller
switches
from
the
active
pair
to
the
mirroring
pair.
Memory
mirroring
reduces
the
amount
of
available
memory.
Enable
memory
mirroring
through
the
Configuration/Setup
Utility
program.
See
“Configuration/Setup
Utility
menu
choices”
on
page
86
for
details
about
enabling
memory
mirroring.
Chapter
2.
Installing
optional
devices
69