Processor
memory
The
DS8100
Model
921
offers
up
to
128
GB
of
processor
memory
and
the
DS8300
Models
922
and
9A2
offer
up
to
256
GB
of
processor
memory.
The
Non-Volatile
Storage
(NVS)
scales
to
the
selected
processor
memory
size,
which
can
also
help
optimize
performance.
Data
management
features
The
DS8000
storage
unit
is
designed
with
the
following
management
features
that
allow
you
to
securely
process
and
access
your
data
according
to
your
business
needs
even
if
it
is
24
hours
a
day
and
7
days
a
week.
RAID
Redundant
array
of
independent
disks
(RAID)
is
a
method
of
configuring
multiple
disk
drives
in
a
storage
subsystem
for
high
availability
and
high
performance.
The
collection
of
two
or
more
disk
drives
presents
the
image
of
a
single
disk
drive
to
the
system.
In
the
event
of
a
single
device
failure,
data
can
be
read
or
regenerated
from
the
other
disk
drives
in
the
array.
With
RAID
implementation,
the
storage
unit
offers
fault-tolerant
data
storage.
The
storage
unit
supports
RAID
implementation
on
the
storage
unit
device
adapters.
The
storage
unit
supports
groups
of
disk
drive
modules
(DDMs)
in
both
RAID
5
and
RAID
10.
RAID
5
RAID
5
is
a
method
of
spreading
volume
data
plus
data
parity
across
multiple
disk
drives.
RAID
5
increases
performance
by
supporting
concurrent
accesses
to
the
multiple
DDMs
within
each
logical
volume.
RAID
10
RAID
10
implementation
provides
data
mirroring
from
one
DDM
to
another
DDM.
RAID
10
stripes
data
across
half
of
the
disk
drives
in
the
RAID
10
configuration.
The
other
half
of
the
array
mirrors
the
first
set
of
disk
drives.
In
some
cases,
RAID
10
offers
faster
data
reads
and
writes
than
RAID
5
because
it
does
not
need
to
manage
parity.
However,
with
half
of
the
DDMs
in
the
group
used
for
data
and
the
other
half
used
to
mirror
that
data,
RAID
10
disk
groups
have
less
capacity
than
RAID
5
disk
groups.
Arrays
across
loops
The
arrays
across
loops
helps
prevent
data
loss.
The
storage
unit
provides
arrays
across
loops
on
open-systems,
S/390,
and
zSeries
hosts.
For
RAID
10,
arrays
across
loops
provides
mirroring
across
two
loops,
which
prevents
loss
of
the
array
during
loop
failure.
Storage
System
LPARs
(logical
partitions)
The
DS8300
Model
9A2
exploits
LPAR
technology,
allowing
you
to
run
two
separate
storage
server
images.
Each
Storage
System
LPAR
has
access
to:
v
50
percent
of
the
processors
v
50
percent
of
the
processor
memory
Chapter
1.
Introduction
to
IBM
TotalStorage
DS8000
series
15
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