Attention:
After
you
remove
a
EV-DDM
CRU,
wait
70
seconds
before
replacing
or
reseating
the
EV-DDM
CRU
to
allow
it
to
properly
spin
down.
Failure
to
do
so
may
cause
undesired
events.
8.
Use
the
DS4000
Storage
Manager
subsystem
management
window
to
verify
that
the
EV-DDM
is
shown
in
the
Storage
Subsystem
Management
window.
Replacing
multiple
EV-DDMs
This
section
provides
guidelines
for
upgrading
the
EV-DDMs
in
the
storage
subsystem.
Read
the
software
documentation
and
this
entire
section
to
determine
if
you
should
use
this
procedure,
use
a
modified
version
of
this
procedure,
or
use
a
different
procedure
that
is
provided
by
your
operating
system.
Note:
Instructions
that
are
provided
with
your
software
should
supersede
anything
stated
in
this
document.
Attention:
After
you
remove
a
EV-DDM
CRU,
wait
70
seconds
before
replacing
or
reseating
the
EV-DDM
CRU
to
allow
it
to
properly
spin
down.
Failure
to
do
so
may
cause
undesired
events.
There
following
are
two
methods
for
upgrading
drives:
v
Replacing
all
the
EV-DDMs
at
the
same
time
This
method
requires
that
you
back
up
the
data
on
the
affected
EV-DDMs
and
then
turn
off
the
DS4200
Express
storage
subsystem.
Attention:
Turn
off
the
DS4200
Express
storage
subsystem
before
you
turn
off
the
attached
storage
expansion
enclosures.
After
replacing
all
the
EV-DDMs,
you
must
reconfigure
them
and
restore
data
from
backup.
See
the
procedure
in
This
is
the
safest
way
to
exchange
EV-DDMs
without
losing
data.
However,
this
method
might
take
a
long
time
to
complete
because
of
the
backup,
reconfiguration,
and
restoration
processes.
In
addition,
other
users
are
not
able
to
use
the
storage
subsystem
(or
any
storage
expansion
enclosures
attached
to
the
storage
subsystem)
until
you
finish
the
procedure.
You
must
use
this
method
on
RAID
0
logical
drives.
v
Replacing
the
EV-DDMs
one
at
a
time
In
this
method,
you
manually
fail
each
EV-DDM,
replace
it,
and
wait
for
the
system
to
restore
data
to
the
new
EV-DDM
before
installing
the
next
EV-DDM.
After
you
install
the
new
EV-DDMs,
you
can
configure
them
to
make
the
additional
drive
space
available.
See
the
procedure
in
Using
this
method,
you
can
replace
the
EV-DDMs
while
the
storage
expansion
enclosures
and
the
DS4200
Express
are
running,
eliminating
the
down
time
that
is
required
if
you
replace
all
the
EV-DDMs
at
once.
However,
this
method
is
more
risky
because
you
can
lose
data
if
the
drive
restoration
or
storage
subsystem
reconfiguration
process
fails.
In
addition,
the
reconstruction
process
might
take
a
long
time.
This
method
works
only
on
redundant
logical
drives
(RAID
1,
3,
or
5).
You
cannot
use
this
method
with
any
drives
containing
RAID
0
logical
drives.
Consider
backing
up
your
data
if
you
use
this
method.
This
safeguards
your
data
if
the
restoration
and
reconfiguration
process
fails
or
the
new
drive
malfunctions.
The
method
you
use
depends
on
the
following
considerations:
Chapter
5.
Replacing
components
115
Summary of Contents for TotalStorage DS4200
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