Chapter
4.
Operating
the
storage
subsystem
To
ensure
optimal
operation
of
your
system,
always
follow
these
best
practices
guidelines:
v
Periodically,
perform
a
full
backup
of
the
data
on
your
storage
drives.
v
Before
any
planned
system
shutdown
or
after
any
system
changes
(additions,
removals,
or
modifications),
save
controller
subsystem
profiles
as
explained
in
the
Storage
Manager
guide
for
your
operating
system.
v
Ensure
that
your
system
is
in
an
optimal
state
before
shutting
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
“Turning
on
the
storage
subsystem”
on
page
92.
Each
component
of
the
subsystem
should
be
checked
that
it
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
“Turning
on
the
storage
subsystem”
on
page
92
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
Storage
Manager
client.
–
The
storage
subsystem
logical
drives
and
arrays
do
not
come
online.
–
The
storage
subsystem
logical
drives
and
arrays
seem
to
be
degraded.
v
Using
the
DS4000
Storage
Manager
client,
save
the
DS4000
subsystem
configuration
profile
to
a
disk
that
is
not
affected
every
time
you
make
changes
to
the
DS4000
subsystem
configuration
(such
as
logical
drive
creation
or
modification,
or
storage
partitioning
changes).
v
DS4300
models
60U/60X
only:
To
maintain
power
redundancy,
plug
the
DS4300
storage
subsystem’s
right
and
left
power
supplies
into
two
independent
external
power
circuits
through
ac
distribution
units
inside
a
rack
cabinet
or
directly
into
external
receptacles.
Similarly,
the
right
and
left
power
supplies
of
the
DS4000
storage
expansion
enclosures
attached
to
the
DS4300
storage
subsystem
should
be
plugged
into
the
same
two
independent
external
power
circuits
as
the
DS4300
storage
subsystem.
This
ensures
that
the
DS4300
storage
subsystem
and
all
its
attached
storage
expansion
enclosures
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
will
enable
the
components
in
the
storage
subsystem
to
power
on
simultaneously
during
an
unattended
restoration
of
power.
See
Figure
72
on
page
86
for
an
example
of
redundant
power
connections.
Performing
the
DS4000
Health
Check
process
The
DS4000
Health
Check
process
is
a
sequence
of
suggested
actions
developed
by
IBM
to
help
users
verify
and
maintain
the
optimal
performance
of
their
DS4000
storage
configurations.
The
information
that
you
collect
in
these
steps
also
helps
provide
IBM
Service
with
important
information
needed
for
problem
troubleshooting
during
IBM
Service
calls.
©
Copyright
IBM
Corp.
2005,
2006
89
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Summary of Contents for TotalStorage DS4300 Turbo
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