should
schedule
the
upgrade
during
a
non-peak
I/O
(low-usage)
period.
Use
the
DS4800
Storage
Manager
performance
monitor
function
to
determine
the
non-peak
I/O
load
time
if
required.
v
Cold-case
upgrade
procedure
—
The
DS4800
storage
subsystem
is
powered
down
when
controllers
are
upgraded.
Note:
The
cold-case
controller
upgrade
procedure
is
recommended
if
your
production
environment
allows
the
scheduling
of
downtime
for
maintenance
purposes.
Refer
to
the
IBM
System
Storage
DS4800
Controller
Upgrade
Kit
Instructions
for
step-by-step
instructions
for
upgrading
DS4800
controller
cache.
Replacing
a
power
supply
and
fan
unit
The
power
supply
and
fan
unit
is
a
component
that
includes
both
a
400-W
power
supply
unit
and
two
fans.
The
power
supply
and
fan
units
provide
power
and
cooling
for
the
DS4800
Storage
Subsystem.
The
power
supply
and
fan
units
are
customer
replaceable
units
(CRUs)
and
do
not
require
preventive
maintenance.
Use
only
the
supported
power
supply
and
fan
units
for
your
specific
storage
subsystem.
Each
power
supply
and
fan
unit
has
a
built-in
sensor
that
detects
the
following
conditions:
v
Over-voltage
v
Over-current
v
Overheated
power
supply
If
any
of
these
conditions
occurs,
one
or
both
power
supplies
will
shut
down.
If
the
power
remains
off
after
the
condition
that
causes
it
to
go
off,
make
sure
that
the
environment
is
optimal
(no
overheating
has
occurred,
all
electrical
outlets
are
working,
and
so
on).
For
more
information,
see
The
storage
subsystem
cooling
system
consists
of
two
fans
in
each
of
the
two
power
supply
and
fan
units.
The
power
supply
and
fan
units
circulate
air
from
the
front
to
the
back
of
the
unit.
If
both
power
supply
and
fan
units
fail,
or
if
the
power
supply
and
fan
units
cannot
maintain
an
internal
temperature
below
70°
C
(158°
F),
the
power
supply
and
fan
units
in
the
unit
will
automatically
shut
down
(an
over-temperature
condition).
If
this
occurs,
you
must
cool
the
unit
and
restart
it.
See
Attention:
The
fans
in
the
power
supply
and
fan
units
draw
in
fresh
air
and
force
out
hot
air.
The
power
supply
and
fan
units
are
hot-swappable
and
redundant;
however,
if
the
fans
in
one
power
supply
and
fan
unit
fail,
you
must
replace
the
entire
failed
power
supply
and
fan
unit
within
48
hours
to
maintain
redundancy
and
optimum
cooling.
Do
not
remove
the
failed
power
supply
and
fan
unit
from
the
DS4800
chassis
until
you
have
the
replacement
power
supply
and
fan
unit.
When
you
do
remove
the
failed
power
supply
and
fan
unit,
be
sure
to
install
the
second
power
supply
and
fan
unit
within
10
minutes
to
prevent
any
overheating
due
to
the
interruption
to
the
air
flow
that
cools
the
DS4800
chassis.
Do
not
run
the
storage
subsystem
without
adequate
ventilation
and
cooling,
because
it
might
cause
damage
to
the
internal
components
and
circuitry.
152
IBM
System
Storage
DS4800
Storage
Subsystem:
Installation,
User’s,
and
Maintenance
Guide
Содержание TotalStorage DS4800
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