Chapter
1.
Storage
Agent
Overview
IBM
Tivoli
Storage
Manager
for
Storage
Area
Networks
is
a
feature
of
Tivoli
Storage
Manager
that
enables
LAN-free
client
data
movement.
This
feature
allows
the
client
system
to
directly
write
data
to,
or
read
data
from,
storage
devices
attached
to
a
storage
area
network
(SAN),
instead
of
passing
or
receiving
the
information
over
the
network.
Data
movement
is
thereby
off-loaded
from
the
LAN
and
from
the
Tivoli
Storage
Manager
server,
making
network
bandwidth
available
for
other
uses.
For
instance,
using
the
SAN
for
client
data
movement
decreases
the
load
on
the
Tivoli
Storage
Manager
server
and
allows
it
to
support
a
greater
number
of
concurrent
client
connections.
See
Figure
1
on
page
2.
The
storage
agent,
a
component
of
the
feature,
makes
LAN-free
data
movement
possible.
The
storage
agent
can
support
several
clients
while
installed
on
only
one
of
the
clients.
You
can
install
the
storage
agent
on
a
client
machine
that
shares
storage
resources
with
the
Tivoli
Storage
Manager
server
(Figure
1
on
page
2)
or
on
a
client
machine
that
does
not
share
storage
resources
but
is
connected
to
a
client
machine
that
does
share
storage
resources
with
the
Tivoli
Storage
Manager
server.
Figure
2
on
page
2shows
multiple
clients
connected
to
a
client
machine
that
contains
the
storage
agent.
You
must
specify
the
LANFREECOMMMETHOD
option
in
the
client
system
options
file
(dsm.sys)
to
allow
the
client
machine
(that
shares
storage
resources)
to
communicate
with
the
storage
agent.
A
Tivoli
Storage
Manager
server,
acting
as
a
library
manager,
controls
the
storage
devices.
This
server
may
be
the
server
working
in
conjunction
with
the
storage
agent
or
another
Tivoli
Storage
Manager
server
in
the
enterprise.
The
Tivoli
Storage
Manager
server
keeps
track
of
the
metadata
that
the
client
has
stored.
The
metadata,
such
as
policy
information
and
file
name
and
size,
is
passed
over
the
LAN
connection
between
the
storage
agent
and
server.
©
Copyright
IBM
Corp.
2000,
2007
1
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