For
example,
the
recovery
procedure
for
an
IBM
Predictive
Failure
Analysis
®
(PFA)
flag
(impending
drive
failure)
on
a
drive
varies
depending
on
the
drive
status
(hot
spare,
unassigned,
RAID
level,
current
logical
drive
status,
and
so
on).
Depending
on
the
circumstances,
a
PFA
flag
on
a
drive
can
indicate
a
high
risk
of
data
loss
(if
the
drive
is
in
a
RAID
0
volume)
or
a
minimal
risk
(if
the
drive
is
unassigned).
Only
the
storage-management
software
can
identify
the
risk
level
and
provide
the
necessary
recovery
procedures.
Note:
For
PFA
flags,
the
General-system-error
LED
and
Drive
fault
LEDs
do
not
turn
on,
so
checking
the
LEDs
will
not
notify
you
of
the
failure,
even
if
the
risk
of
data
loss
is
high.
Recovering
from
a
storage-server
failure
might
require
you
to
perform
procedures
other
than
replacing
the
component
(such
as
backing
up
the
logical
drive
or
failing
a
drive
before
removing
it).
The
storage-management
software
gives
these
procedures.
Attention:
Not
following
the
software-recovery
procedures
can
result
in
data
loss.
Firmware
updates
In
order
to
ensure
the
optimal
operation
of
the
DS4300
storage
subsystem
and
its
attached
storage
expansion
enclosures,
the
storage
expansion
enclosure
ESM
firmware,
the
DS4300
storage
subsystem
controller
firmware,
the
hard
drive
firmware,
and
the
NVSRAM
(for
controllers
only)
must
be
up
to
date.
Go
to
the
following
Web
site
to
get
the
latest
updates:
http://www-1.ibm.com/servers/storage/support/disk/
Apply
the
necessary
updates
before
configuring
the
DS4300
arrays
and
logical
drives.
Subscribe
to
My
Support
for
automatic
notifications
of
firmware
or
storage
manager
software
updates
or
any
important
information
about
your
DS4000
subsystems
(see
“Product
updates”
on
page
1).
Attention:
Read
the
Readme
file
that
is
included
in
each
firmware
or
DS4000
Storage
Manager
software
package
for
any
limitations,
subsystem
firmware
prerequisites,
or
download-sequence
information.
For
example,
the
controller
firmware
code
might
require
the
storage
expansion
enclosure
ESM
firmware
to
be
upgraded
first
to
a
particular
version,
or
the
controller
firmware
download
might
require
the
halting
of
I/Os
to
the
DS4300
storage
subsystem’s
logical
drives.
Failure
to
observe
the
limitations,
prerequisites,
and
dependencies
in
the
Readme
file
might
result
in
a
loss
of
data
access.
Checking
the
LEDs
The
LEDs
display
the
status
of
the
storage
subsystem
and
components.
Green
LEDs
indicate
a
normal
operating
status;
amber
LEDs
indicate
a
possible
failure.
It
is
important
to
check
all
the
LEDs
on
the
front
and
back
of
the
storage
subsystem
when
you
turn
on
the
power.
In
addition
to
checking
for
faults,
you
can
use
the
LEDs
on
the
front
of
the
storage
subsystem
to
determine
if
the
drives
are
responding
to
I/O
transmissions
from
the
host.
For
information
about
the
LEDs
on
the
front
of
the
storage
subsystem,
see
the
following:
v
Figure
73
on
page
98
Chapter
4.
Operating
the
storage
subsystem
97
Summary of Contents for TotalStorage DS4300 Turbo
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