Storage server components, Storage, Server – IBM Partner Pavilion DS4100 User Manual
Page 39: Components
the
DS4000
storage
expansion
units
attached
to
the
DS4100
storage
server
should
be
plugged
into
the
same
two
independent
external
power
circuits
as
the
DS4100.
This
ensures
that
the
DS4100
storage
server
and
all
its
attached
storage
expansion
units
will
have
power
if
only
one
power
circuit
is
available.
In
addition,
having
all
the
right
or
all
the
left
power
supplies
plug
into
the
same
power
circuit
enables
the
components
in
the
storage
subsystem
to
power
on
simultaneously
during
an
unattended
restoration
of
power.
See
for
an
example
of
redundant
power
connections.
Note:
This
guideline
cannot
be
followed
for
the
DS4100
single-controller
storage
server,
which
does
not
offer
redundant
power
supplies.
However,
you
can
use
Uninterruptible
Power
Supply
(UPS)
units
with
the
DS4100
single-controller
storage
server
to
provide
protection
against
power
brown-outs
and
short
power
outages.
v
Before
any
planned
system
shutdown
or
after
any
system
additions,
removals,
or
modifications
(including
logical
drive
creations,
storage
partitioning
definitions,
hardware
changes,
and
so
on),
save
the
storage
subsystem
profile
as
explained
in
the
DS4000
Storage
Manager
guide
for
your
operating
system.
Save
the
profile
in
a
location
other
than
the
logical
drives
created
for
the
DS4100
storage
server.
v
Ensure
that
your
system
is
in
an
optimal
state
before
you
shut
it
down.
Never
turn
the
power
off
if
any
fault
light
is
lit;
be
sure
to
resolve
any
error
conditions
before
you
shut
down
the
system.
v
During
any
maintenance
or
attended
power-up
procedure,
carefully
follow
the
power-up
sequence
listed
in
Check
that
each
component
of
the
subsystem
is
powered-on
in
the
proper
order
during
this
entire
power-up
procedure
to
ensure
the
controller
will
be
able
to
optimally
access
all
of
your
storage
subsystems.
v
The
storage
subsystem
supports
simultaneous
power-up
to
the
system
components;
however,
you
should
always
follow
the
power-up
sequence
listed
in
during
any
attended
power-up
procedure.
v
A
storage
system
in
an
optimal
state
should
recover
automatically
from
an
unexpected
shutdown
and
unattended
simultaneous
restoration
of
power
to
system
components.
After
power
is
restored,
call
IBM
support
if
any
of
the
following
conditions
occur:
–
The
storage
subsystem
logical
drives
and
arrays
are
not
displayed
in
the
DS4000
Storage
Manager
graphical
user
interface
(GUI).
–
The
storage
subsystem
logical
drives
and
arrays
do
not
come
online.
–
The
storage
subsystem
logical
drives
and
arrays
seem
to
be
degraded.
Storage
server
components
The
following
sections
show
the
components
of
the
DS4100
storage
server.
Hot-swappable
devices
enable
you
to
maintain
the
availability
of
your
system
while
you
remove,
install,
or
replace
a
hot-swap
device.
All
DS4100
storage
server
models
support
hot-swap
SATA
hard
disk
drives
and
cooling
fan
CRUs,
so
you
can
remove
and
replace
these
components
without
turning
off
the
storage
server.
In
addition,
the
DS4100
base
storage
server
supports
hot-swap
RAID
controllers
and
power
supplies.
Chapter
1.
Introduction
7