Chapter
1.
SAN
Volume
Controller
The
SAN
Volume
Controller
is
a
SAN
appliance
that
attaches
open-systems
storage
devices
to
supported
open-systems
hosts.
The
IBM
TotalStorage
SAN
Volume
Controller
provides
symmetric
virtualization
by
creating
a
pool
of
managed
disks
from
the
attached
storage
subsystems,
which
are
then
mapped
to
a
set
of
virtual
disks
for
use
by
attached
host
computer
systems.
System
administrators
can
view
and
access
a
common
pool
of
storage
on
the
SAN,
which
enables
them
to
use
storage
resources
more
efficiently
and
provides
a
common
base
for
advanced
functions.
The
SAN
Volume
Controller
is
analogous
to
a
logical
volume
manager
(LVM)
on
a
SAN.
It
performs
the
following
functions
for
the
SAN
storage
that
it
is
controlling:
v
Creates
a
single
pool
of
storage
v
Manages
logical
volumes
v
Provides
advanced
functions
for
the
SAN,
such
as:
–
Large
scalable
cache
–
Copy
services
-
FlashCopy
®
(point-in-time
copy)
-
Remote
Copy
(synchronous
copy)
–
Space
management
-
Mapping
that
is
based
on
desired
performance
characteristics
-
Quality
of
service
metering
A
node
is
a
single
storage
engine.
The
storage
engines
are
always
installed
in
pairs
with
one
or
two
pairs
of
nodes
constituting
a
cluster
.
Each
node
in
a
pair
is
configured
to
back
up
the
other.
Each
pair
of
nodes
is
known
as
an
I/O
group
.
All
I/O
operations
handled
by
the
nodes
in
an
I/O
group
are
cached
on
both
nodes
Figure
12.
A
SAN
Volume
Controller
node
©
Copyright
IBM
Corp.
2003,
2004
1
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