DRAFT
Enabling
the
enhanced
Serial
ATA
hard
disk
driver
interface
IBM
SurePOS
700
Models
742,
782,
723,
743,
and
783
have
an
embedded
Serial
ATA
(SATA)
controller
with
Advanced
Host
Controller
Interface
(AHCI)
and
Redundant
Array
of
Independent
Disks
(RAID)
support.
To
take
advantage
of
either
of
these
features,
they
must
be
enabled
prior
to
operating
system
installation
and
the
driver
must
be
installed
during
the
installation
of
the
operating
system.
Once
the
operating
system
is
installed,
the
mode
of
operation
can
not
be
changed
without
reinstalling
the
operating
system.
AHCI
and
Native
Command
Queueing
Models
742,
782,
723,
743,
and
783
can
enable
the
AHCI
mode
of
operation,
if
they
have
a
hard
drive
installed.
Currently,
AHCI
mode
does
not
provide
any
measurable
performance
benefit
with
the
standard
hard
disk
drive
installed
in
Models
742
or
782.
However,
the
Native
Command
Queueing
(NCQ)
is
becoming
a
standard
feature
on
hard
disk
drives
and
will
provide
a
performance
benefit,
if
the
AHCI
controller
is
enabled.
IBM
will
not
provide
a
replacement
or
an
upgrade
of
customer
hard
disk
drives
should
this
feature
become
standard.
If
the
application
requires
a
drive
with
NCQ
support,
you
should
submit
an
RPQ
through
your
IBM
Sales
Representative.
This
information
is
provided
to
allow
customers
to
prepare
OS/Application
images
properly
for
future
use.
RAID
0
and
RAID
1
Enabling
the
native
RAID
application
requires
a
Models
742,
782,
723,
743,
and
783
with
one
or
two
hard
disk
drives.
To
take
full
advantage
of
the
RAID
function,
you
must
install
two
drives.
With
two
drives
installed,
the
native
RAID
function
supports
both
RAID
0
and
RAID
1.
For
two
drive
implementations,
RAID
1
is
the
recommended
mode
of
operation.
Enabling
RAID
and
using
the
RAID
driver
is
the
recommended
mode
of
operation
for
one
and
two
drive
configurations.
The
RAID
mode
of
operation
will
take
advantage
of
NCQ
1
with
single
drive
systems.
Also,
single
drive
systems
with
RAID
enabled
can
be
later
upgraded
to
two
drive
systems
by
just
adding
the
second
hard
disk
drive,
booting
the
OS
and
using
the
RAID
utility
to
create
an
array
without
requiring
the
OS
or
applications
to
be
reinstalled.
RAID
0
(striping)
Increases
the
system
hard
disk
performance,
however
the
overall
reliability
is
reduced
as
a
single
drive
failure
will
result
in
total
data
loss.
RAID
1
(mirroring)
Does
not
increase
performance,
but
the
drives
are
maintained
as
identical
copies.
If
one
hard
disk
drive
experiences
a
hardware
failure,
the
system
will
continue
to
function
until
the
failing
drive
can
be
serviced.
Note:
RAID
does
not
prevent
or
eliminate
errors
caused
by
OS
issues,
application
failures,
corrupt
files,
viruses
and
other
software
induced
problems
that
are
often
perceived
as
hard
drive
failures.
RAID
1
can
only
minimize
the
impact
of
a
single
hard
drive
hardware
failure.
1. Dependant
upon
the
NCQ
feature
becoming
the
standard
in
the
industry.
Updated
October,
2007
Chapter
1.
Preparing
for
the
installation
3
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Содержание SurePOS 700 Series
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