To
add
or
remove
additional
control
paths,
refer
to
For
a
particular
logical
library,
you
can
enable
as
many
control
paths
as
there
are
drives
in
that
logical
library.
Using
Multiple
Control
Paths
for
iSeries
and
AS/400
Attachment
The
use
of
control
paths
for
the
iSeries
and
AS/400
servers
is
unique.
In
general,
every
iSeries
adapter
must
recognize
the
control
path
that
is
associated
with
the
drives
to
which
it
is
connected.
For
the
iSeries
and
AS/400
servers,
one
to
six
drives
are
supported
by
LVD
and
Fibre
Channel
adapters
and
the
OS/400
5.1,
OS/400
5.2,
or
OS/400
5.3
operating
system.
Using
Multiple
Control
Paths
for
Control
Path
Failover
Command
failures
and
timeouts
are
costly.
You
want
your
library
to
run
smoothly
and
efficiently.
To
ensure
continued
processing,
the
library
offers
an
optional
control
path
failover
feature
that
enables
the
host
device
driver
to
resend
the
command
to
an
alternate
control
path
for
the
same
logical
library.
With
control
path
failover
installed,
the
alternate
control
path
can
include
another
HBA,
SAN,
or
library
control
path
drive.
The
device
driver
initiates
error
recovery
and
continues
the
operation
on
the
alternate
control
path
without
interrupting
the
application.
AIX,
Linux,
Solaris,
HP-UX,
and
Windows
hosts
are
currently
supported
for
this
feature.
The
Control
Path
Failover
feature
can
be
installed
by
the
customer.
For
ordering
information,
see
Note:
The
Control
Path
Failover
feature
is
activated
by
a
license
key.
For
more
information
about
using
the
control
path
failover
feature,
see
the
IBM
Ultrium
Device
Drivers
Installation
and
User’s
Guide
.
Note:
LTO-3
SCSI
and
Fibre
Channel
drives
are
not
allowed
in
the
same
logical
library.
Using
Multiple
Data
Paths
for
Data
Path
Failover
Data
Path
Failover
and
Load
Balancing
exclusively
supports
native
Fibre
Channel
Ultrium
3
Tape
Drives
in
the
library
using
the
IBM
device
driver
for
AIX
and
Linux.
Data
Path
Failover
is
designed
to
provide
a
failover
mechanism
in
the
IBM
device
driver,
which
enable
multiple
redundant
paths
to
be
configured
in
a
SAN
environment.
In
the
event
of
a
path
or
component
failure,
the
failover
mechanism
is
designed
to
automatically
provide
error
recovery
to
retry
the
current
operation
using
an
alternate,
pre-configured
path
without
aborting
the
current
job
in
progress.
This
allows
flexibility
in
SAN
configuration,
availability,
and
management.
When
accessing
a
tape
drive
device
that
has
been
configured
with
alternate
paths
across
multiple
host
ports,
the
IBM
device
driver
automatically
selects
a
path
through
the
host
bus
adapter
(HBA)
that
has
the
fewest
open
tape
devices
and
assigns
that
path
to
the
application.
This
autonomic
self-optimizing
capability
is
called
Load
Balancing.
The
dynamic
load
balancing
support
is
designed
to
optimize
resources
for
devices
that
have
physical
connections
to
multiple
HBAs
in
the
same
machine.
The
device
driver
is
designed
to
dynamically
track
the
usage
on
each
HBA
as
applications
open
and
close
devices,
and
balance
the
number
of
applications
using
each
HBA
in
the
machine.
This
may
help
optimize
HBA
Chapter
2.
Installation
Planning
2-3
Summary of Contents for System Storage TS3310
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