3.
Stop
all
I/O
activity
to
the
storage
server
and
attached
expansion
units.
Make
sure
that:
v
All
of
the
green
Drive
active
LEDs
on
the
front
of
the
storage
server
(and
on
all
attached
expansion
units)
are
not
flashing.
v
The
green
Cache
active
LEDs
on
the
back
of
the
storage
server
are
off.
Attention:
To
turn
off
all
power
to
the
storage
server,
you
must
turn
off
both
power-supply
switches
and
disconnect
both
power
cords.
Use
the
procedure
in
step
6
for
the
proper
shutdown
sequence.
4.
Before
the
storage
server
is
powered
off,
use
the
operating
system
software
to
either
disconnect
the
storage
server
logical
drives
from
the
host
or
to
flush
the
logical
drive
data
cache
in
the
host
server
memory.
5.
If
applicable,
use
the
operating
system
software
to
disconnect
the
storage
server
logical
drives
from
the
host
before
the
storage
server
is
powered
off.
6.
Turn
off
the
power
to
each
device
based
on
the
following
shutdown
sequence:
a.
Turn
off
power
to
the
host
before
the
storage
server.
If
the
host
must
stay
powered
on
to
support
an
existing
network,
see
the
operating
system
documentation
for
information
about
disconnecting
the
storage
server
logical
drives
from
the
host
before
the
storage
server
is
powered
off.
b.
Turn
off
power
to
the
storage
server
before
you
turn
off
power
to
the
expansion
units.
Turn
off
both
power
supply
switches
on
the
back
of
the
storage
server.
c.
Turn
off
power
to
other
supporting
devices
(for
example,
management
stations,
fibre-channel
switches,
or
Ethernet
switches).
Note:
You
do
not
need
to
perform
this
step
if
you
are
servicing
only
the
storage
server.
7.
After
you
perform
the
necessary
maintenance
procedures,
turn
on
the
power
using
the
procedure
in
“Turning
on
the
storage
server”
on
page
66.
Restoring
power
after
an
unexpected
shutdown
The
storage
server
might
shut
down
unexpectedly
under
any
of
the
following
conditions:
Attention:
There
might
be
data
loss
in
each
of
the
following
cases:
v
The
internal
temperature
of
the
storage
server
exceeds
the
maximum
operating
temperature
(an
over-temperature
condition).
If
both
fan
CRUs
fail
or
are
unable
to
maintain
an
internal
temperature
below
70°
C
(158°
F),
one
or
both
of
the
power
supplies
in
the
storage
server
will
shut
down.
If
both
power
supplies
shut
down,
the
unit
is
inoperable.
The
DS4000
Storage
Manager
client
warns
you
if
the
temperature
of
the
unit
is
rising
before
it
has
risen
sufficiently
to
shut
down
the
power
supplies.
The
first
warning
comes
when
the
storage
server
internal
temperature
exceeds
45°
C
(113°
F).
The
storage
server
shuts
down
if
the
temperature
rises
to
70°
C
(158°
F).
v
There
is
a
general
power
failure
or
a
loss
of
power
to
the
unit.
v
You
are
forced
to
shut
down
the
storage
server
without
performing
the
normal
shutdown
procedures
(listed
in
“Turning
off
the
storage
server”
on
page
67)
because
of
an
emergency
situation.
68
IBM
TotalStorage
DS4100
Storage
Server:
Installation,
User’s,
and
Maintenance
Guide
Summary of Contents for TotalStorage DS4100
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