Replacing a raid controller, Replacing, Raid – IBM Partner Pavilion DS4100 User Manual
Page 128: Controller
Replacing
a
RAID
controller
When
instructed
to
do
so
by
the
DS4000
Storage
Manager
client,
replace
a
RAID
controller
that
has
failed.
The
procedure
for
replacing
a
failed
controller
is
different
for
DS4100
single-controller
and
base
(dual-controller)
storage
servers.
If
a
controller
in
a
DS4100
base
storage
server
fails,
you
can
replace
the
failed
controller
without
interrupting
data
processing.
The
system
will
automatically
update
the
firmware
for
the
new
controller
to
match
the
configuration
database.
If
the
controller
in
a
DS4100
single-controller
storage
server
fails,
you
may
need
to
manually
update
the
firmware
level
to
match
the
configuration
database.
If
the
firmware
level
of
the
new
controller
matches
the
configuration
database,
the
storage
server
will
boot
normally
after
you
install
the
new
controller.
If
the
firmware
level
does
not
match
the
database,
the
storage
server
will
reach
a
stop
state
in
the
boot
process,
and
you
will
need
to
manually
update
the
firmware
level
to
match
the
configuration
database.
Attention:
Because
the
replacement
RAID
controller
has
a
different
WWNN
that
the
original
RAID
controller,
you
must
perform
the
following
tasks
in
order
to
bring
the
DS4100
single-controller
storage
server
to
running
(optimal)
state
after
you
replace
the
RAID
controller.
v
Reboot
the
host
server
that
has
mapped
logical
drives
from
the
DS4100
single-controller
storage
server.
Rebooting
the
host
server
enables
the
multipath
failover
to
recognize
the
logical
drives
under
the
new
WWNN.
In
addition,
if
your
multipath
driver
uses
the
WWNN
of
the
controller
as
part
of
the
LUN
identification,
you
may
have
to
reconfigure
the
LUN
failover/failback
path
information.
v
Use
DS4000
Storage
Manager
to
rediscover
the
new
RAID
controller.
To
rediscover
the
new
RAID
controller,
remove
the
existing
DS4100
single-controller
storage
server
entry
in
the
management
domain
of
the
DS4000
Storage
Manager
client
Enterprise
Management
Window
(EMW),
and
then
add
the
DS4100
single-controller
storage
server
back
into
the
management
domain
using
the
in-band
or
out-of-band
management
method.
See
step
v
Re-enable
the
premium
feature
keys.
After
you
replace
the
RAID
controller
in
a
DS4100
single-controller
storage
server,
all
of
the
enabled
premium
feature
keys
are
displayed
as
being
out-of-compliance.
Use
the
existing
key
files
to
re-enable
the
premium
feature
keys.
v
If
you
create
zones
using
the
RAID
controller
WWNN,
update
your
zoning
definitions
with
the
new
WWNN
for
the
replacement
RAID
controller.
Important
The
replacement
RAID
controller
CRU
does
not
come
with
a
RAID
controller
cache
battery
installed,
nor
does
it
come
with
the
mounting
hardware
that
holds
the
battery
in
place
inside
the
RAID
controller.
You
must
remove
the
cache
battery
that
is
inside
the
existing
RAID
controller
that
you
are
replacing,
and
install
that
battery
inside
the
replacement
RAID
controller
CRU,
using
the
battery
unit
mounting
hardware
taken
from
the
existing
controller.
The
steps
to
remove
and
replace
the
battery
are
included
in
the
following
procedure.
96
IBM
TotalStorage
DS4100
Storage
Server:
Installation,
User’s,
and
Maintenance
Guide