v
The
internal
temperature
of
the
storage
subsystem
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
subsystem
will
shut
down.
If
both
power
supplies
shut
down,
the
unit
is
inoperable.
The
storage-management
software
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
subsystem
internal
temperature
exceeds
45°C
(113°F).
The
storage
subsystem
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
subsystem
without
performing
the
normal
shutdown
procedures
(listed
in
“Turning
off
the
storage
subsystem”
on
page
93)
because
of
an
emergency
situation.
Attention:
To
avoid
damage
to
the
hardware,
take
special
care
when
restarting
the
system
after
an
unexpected
shutdown.
If
the
storage
subsystem
shuts
down
unexpectedly,
go
to
“Restoring
power
after
an
over-temperature
shutdown”
on
page
96.
Otherwise,
go
to
“Restoring
power
after
an
emergency
shutdown.”
Note:
Unattended
restoration
of
power
is
supported;
however,
if
power
restoration
is
attended,
you
should
follow
the
best
practices
guidelines
and
the
power
restoration
sequence
in
“Turning
on
the
storage
subsystem”
on
page
92.
Performing
an
emergency
shutdown
Attention:
Emergency
situations
might
include
fire,
flood,
extreme
weather
conditions,
or
other
hazardous
circumstances.
If
a
power
outage
or
emergency
situation
occurs,
always
turn
off
all
power
switches
on
all
computing
equipment.
This
will
help
safeguard
your
equipment
from
potential
damage
due
to
electrical
surges
when
power
is
restored.
If
the
storage
subsystem
loses
power
unexpectedly,
it
might
be
due
to
a
hardware
failure
in
the
power
system
or
midplane
(see
“Troubleshooting”
on
page
145).
Use
the
following
procedure
to
shut
down
the
storage
subsystem
during
an
emergency:
1.
If
you
have
time,
stop
all
I/O
activity
to
the
storage
subsystem
by
shutting
down
the
host
or
disconnecting
the
storage
subsystem
logical
drives
through
the
host.
2.
Check
the
LEDs
(front
and
back).
Make
note
of
any
Fault
LEDs
that
are
on
so
you
can
correct
the
problem
when
you
turn
on
the
power
again.
3.
Turn
off
all
power-supply
switches
starting
with
the
DS4300
storage
subsystem
power
supply
switches
first
and
then
the
power
supply
switches
of
the
attached
storage
expansion
enclosures;
then
unplug
the
power
cords
from
the
storage
subsystem.
Restoring
power
after
an
emergency
shutdown
Use
the
following
procedure
to
restart
the
storage
subsystem
if
you
turned
off
the
power-supply
switches
during
an
emergency
shutdown,
or
if
a
power
failure
or
a
power
outage
occurred:
Chapter
4.
Operating
the
storage
subsystem
95
Summary of Contents for TotalStorage DS4300 Turbo
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