v
Storage
unit
fibre-channel
port
The
maximum
distance
might
be
greater
than
11
km
(6
mi)
when
a
link
extender
provides
target
initiator
functions
or
controller
emulation
functions.
You
should
not
use
link
extenders
with
emulation
functions
on
links
over
which
Remote
Mirror
and
Copy
operations
are
performed.
This
is
because
of
the
additional
path
delay
introduced
by
these
units.
LUN
affinity
for
fibre-channel
attachment
You
can
use
a
WWPN
to
associate
a
LUN
for
fibre-channel
attachment.
For
fibre-channel
attachment,
LUNs
have
an
affinity
to
the
host’s
fibre-channel
adapter
through
the
worldwide
port
name
(WWPN)
for
the
host
adapter.
In
a
switched
fabric
configuration,
a
single
fibre-channel
host
adapter
could
have
physical
access
to
multiple
fibre-channel
ports
on
the
storage
unit.
In
this
case,
you
can
configure
the
storage
unit
to
allow
the
host
to
use
either
some
or
all
of
the
physically
accessible
fibre-channel
ports
on
the
storage
unit.
Targets
and
LUNs
for
fibre-channel
attachment
You
can
attach
a
fibre-channel
host
adapter
to
a
LUN.
For
fibre-channel
attachment,
each
fibre-channel
host
adapter
can
architecturally
attach
up
to
2
LUNs.
The
storage
unit
supports
64K
LUNs
and
a
maximum
LUN
size
of
2TB
divided
into
a
maximum
of
16
logical
subsystems
each
with
up
to
256
LUNs.
You
can
configure
no
more
than
256
of
the
LUNs
in
the
storage
unit
to
be
accessible
by
that
host.
LUN
access
modes
for
fibre-channel
attachment
Several
modes
allow
LUN
access
for
fibre-channel
attachment.
The
following
sections
describe
the
LUN
access
modes
for
fibre-channel.
Fibre-channel
access
modes
The
fibre-channel
architecture
allows
any
fibre-channel
initiator
to
access
any
fibre-channel
device,
without
access
restrictions.
However,
in
some
environments
this
kind
of
flexibility
can
represent
a
security
exposure.
Therefore,
the
IBM
TotalStorage
DS6000
allows
you
to
restrict
this
type
of
access
when
IBM
sets
the
access
mode
for
your
storage
unit
during
initial
configuration.
There
are
two
types
of
LUN
access
modes:
1.
Access-any
mode
The
access-any
mode
allows
all
fibre-channel
attached
host
systems
that
do
not
have
an
access
profile
to
access
all
non-iSeries
open
system
logical
volumes
that
you
have
defined
in
the
storage
unit.
Note:
If
you
connect
the
storage
unit
to
more
than
one
host
system
with
multiple
platforms
and
use
the
access-any
mode
without
setting
up
an
access
profile
for
the
hosts,
the
data
in
the
LUN
used
by
one
open-systems
host
might
be
inadvertently
corrupted
by
a
second
open-systems
host.
Certain
host
operating
systems
insist
on
overwriting
specific
LUN
tracks
during
the
LUN
discovery
phase
of
the
operating
system
start
process.
2.
Access-restricted
mode
16
DS6000
Host
Systems
Attachment
Guide
Summary of Contents for System storage DS6000 Series
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