Attention:
If
you
are
removing
both
controllers
(controller
A
and
controller
B)
from
the
DS4500
Storage
Server,
label
controllers
A
and
B
with
the
white
tape
dots
that
are
included
in
the
rack
mounting
assembly
kit.
To
prevent
data
loss,
the
controllers
must
be
installed
into
their
original
location.
Servicing
notes
Consider
the
following
factors
when
servicing
the
controllers
in
the
DS4500
Storage
Server:
v
The
DS4500
Storage
Server
supports
two
controller
CRUs,
which
attach
to
hosts
through
Fibre
Channel
connections.
v
You
can
hot
swap
or
replace
a
failed
controller
while
the
DS4500
Storage
Server
is
in
operation
as
long
as
the
host
has
a
Fibre
Channel
connection
to
the
functioning
controller
and
is
in
a
“passive”
or
“offline”
status
in
the
storage-management
software.
v
If
cache
mirroring
is
enabled
in
redundant
controllers
and
one
controller
fails,
the
second
controller
assumes
processing
functions
without
data
loss.
However,
some
or
all
data
might
be
lost
if
cache
mirroring
is
disabled
and
a
failure
occurs
before
data
is
written
from
cache
memory
to
disk.
v
If
you
replace
the
controller
CRU
and
still
experience
problems,
the
DS4500
Storage
Server
might
have
other
defective
components
or
connections.
Check
the
storage-management
software
for
indications
of
other
component
failures.
v
When
a
controller
CRU
fails,
the
fault
light
on
the
affected
controller
is
lit.
For
more
information
about
indicator
lights,
see
“RAID
controller
indicator
lights”
on
page
28.
Figure
33.
Controller
status
indicator
lights
44
IBM
TotalStorage
DS4500
Fibre
Channel
Storage
Server:
User’s
Guide
Summary of Contents for TotalStorage DS4500
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