for
resilience.
Each
virtual
volume
is
defined
to
an
I/O
group.
To
eliminate
any
single
point
of
failure,
each
of
the
two
nodes
in
the
I/O
group
are
protected
by
different
uninterruptible
power
supplies.
The
SAN
Volume
Controller
I/O
groups
see
the
storage
presented
to
the
SAN
by
the
back-end
controllers
as
a
number
of
disks
known
as
managed
disks
.
The
application
services
do
not
see
these
managed
disks.
Instead
they
see
a
number
of
logical
disks,
known
as
virtual
disks
,
that
are
presented
to
the
SAN
by
the
SAN
Volume
Controller.
Each
node
must
only
be
in
one
I/O
group
and
provide
access
to
the
virtual
disks
in
the
I/O
group.
The
SAN
Volume
Controller
helps
to
provide
continuous
operations
and
can
also
optimize
the
data
path
to
ensure
performance
levels
are
maintained.
The
fabric
contains
two
distinct
zones:
a
host
zone
and
a
disk
zone.
In
the
host
zone,
the
host
systems
can
identify
and
address
the
nodes.
You
can
have
more
than
one
host
zone.
Generally,
you
will
create
one
host
zone
per
operating
system
type.
In
the
disk
zone,
the
nodes
can
identify
the
disk
drives.
Host
systems
cannot
operate
on
the
disk
drives
directly;
all
data
transfer
occurs
through
the
nodes.
As
shown
in
several
host
systems
can
be
connected
to
a
SAN
fabric.
A
cluster
of
SAN
Volume
Controllers
is
connected
to
the
same
fabric
and
presents
virtual
disks
to
the
host
systems.
You
configure
these
virtual
disks
using
the
disks
located
on
the
RAID
controllers.
Note:
You
can
have
more
than
one
host
zone.
Generally
you
create
one
host
zone
per
operating
system
type
because
some
operating
systems
will
not
tolerate
other
operating
systems
in
the
same
zone.
Fibre Channel
Fabric
Host
Host
Host
Host
SAN Volume
Controller
.
.
.
RAID
RAID
RAID
RAID
. . .
Host zone
Disk zone
SAN Volume
Controller
SAN Volume
Controller
Figure
13.
Example
of
a
SAN
Volume
Controller
in
a
fabric
2
Installation
Guide
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