Lan-free client data backup scenario, Lan-free, Client – IBM TIVOLI SC32-0129-00 User Manual
Page 21: Data, Backup, Scenario
The
storage
agent
communicates
with
the
server
to
obtain
and
store
database
information
and
to
coordinate
device
and
volume
access.
The
server
and
client
coordinate
and
negotiate
data
access
through
the
SAN.
The
client
will
use
the
storage
agent
for
operations
where
appropriate.
For
example,
if
a
SAN
path
is
defined,
the
client
(by
means
of
the
storage
agent)
transfers
data
on
that
path.
If
a
failure
occurs
on
the
SAN
path,
failover
occurs
and
the
client
uses
its
LAN
connection
to
the
Tivoli
Storage
Manager
server
and
moves
the
client
data
over
the
LAN.
There
are
cases
when
the
storage
agent
can
send
the
data
directly
to
the
server
using
the
LAN
control
paths
between
the
storage
agent
and
the
server.
An
example
of
this
would
be
a
LAN-free
storage
pool
that
is
updated
to
read-only
after
the
client
connects
to
the
server
and
obtains
its
initial
policy
information.
The
storage
agent,
instead
of
failing
the
operation,
will
send
the
data
to
the
server,
and,
providing
that
the
storage
hierarchy
is
configured
so
that
the
next
storage
pool
destination
is
available,
the
server
will
handle
the
operation.
You
can
also
prevent
data
from
transferring
over
the
LAN
by
specifying
the
Tivoli
Storage
Manager
server
parameters
DATAREADPATH
and
DATAWRITEPATH
with
the
REGISTER
NODE
or
UPDATE
NODE
commands
for
the
desired
node.
These
settings
can
be
reviewed
by
issuing
the
following
command
on
the
server
for
this
node:
query
node
node_name
format=detailed
Tivoli
Storage
Manager
supports
SAN-attached
device
sharing
in
one
of
the
following
ways:
v
Tivoli
Storage
Manager
native
library
management
support
consisting
of
a
library
manager
and
library
clients
or
just
a
library
manager.
See
for
details
regarding
libraries.
v
Shared
disk
storage
using
a
FILE
library
and
the
integration
of
Tivoli
SANergy,
IBM
TotalStorage
SAN
File
System
or
other
supported
file-sharing
software.
For
current
information
about
supported
file-sharing
software,
see
v
External
libraries
as
defined
in
the
Administrator’s
Guide
in
the
appendix,
″External
Media
Management
Interface
Description.
″
For
additional
information
about
these
configurations,
see
LAN-free
Client
Data
Backup
Scenario
The
following
outlines
a
typical
backup
scenario
for
a
Tivoli
Storage
Manager
client
that
uses
SAN
data
movement:
1.
The
client
begins
a
backup
operation.
The
server
reports
policy
information
to
the
client,
including
whether
a
destination
is
LAN-free.
As
the
client
assigns
policy
settings
for
files
during
backup
processing,
it
sends
the
data
LAN-free
when
the
destination
for
that
policy
is
LAN-free
enabled.
A
storage
pool
is
a
LAN-free
destination
when
the
storage
pool
uses
a
device
shared
on
a
SAN.
That
device
must
also
have
a
defined
path
between
the
device
and
the
storage
agent.
2.
The
storage
agent
receives
data
for
those
files
backed
up
by
the
client
and
assigned
to
policy
settings
that
use
a
LAN-free
enabled
storage
pool.
The
storage
agent
sends
a
request
for
a
volume
mount
to
the
library
manager
server.
In
the
external
library
case,
the
storage
agent
contacts
the
external
library
manager,
using
the
provided
path
to
the
executable.
Chapter
1.
Storage
Agent
Overview
3
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