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Multiple
relationship
FlashCopy
Multiple
relationship
FlashCopy
allows
a
source
to
have
FlashCopy
relationships
with
multiple
targets
simultaneously.
This
flexibility
allows
you
to
establish
up
to
12
FlashCopy
relationships
on
a
given
logical
unit
number
(LUN),
volume,
or
data
set,
without
needing
to
first
wait
for
or
cause
previous
relationships
to
end.
Refresh
target
volume
(also
known
as
incremental
FlashCopy)
Refresh
target
volume
provides
the
ability
to
″
refresh
″
a
LUN
or
volume
involved
in
a
FlashCopy
relationship.
When
a
subsequent
FlashCopy
operation
is
initiated,
only
data
that
updates
the
target
and
the
source
to
the
same
point-in-time
state
is
copied.
The
direction
of
the
″
refresh
″
can
also
be
reversed.
The
LUN
or
volume
that
was
defined
as
the
target
can
now
become
the
source
for
the
LUN
or
the
volume
that
was
defined
as
the
source
(now
the
target).
Persistent
FlashCopy
Persistent
FlashCopy
allows
the
FlashCopy
relationship
to
remain
even
after
the
FlashCopy
operation
completes.
You
must
explicitly
delete
the
relationship.
Establish
FlashCopy
on
existing
Remote
Mirror
and
Copy
source
The
establish
FlashCopy
on
an
existing
Remote
Mirror
and
Copy
source
volume
option
allows
you
to
establish
a
FlashCopy
relationship
where
the
target
volume
is
also
the
source
of
an
existing
remote
mirror
and
copy
source
volume.
This
enables
you
to
create
full
or
incremental
point-in-time
copies
at
a
local
site
and
then
use
remote
mirroring
commands
to
copy
the
data
to
the
remote
site.
This
feature
is
represented
by
the
Establish
target
on
existing
Metro
Mirror
source
selection
in
the
GUI.
Consistency
group
commands
Consistency
group
commands
allow
the
DS8000
to
freeze
I/O
activity
to
a
LUN
or
volume
until
you
issue
the
FlashCopy
consistency
group
command.
Consistency
groups
help
create
a
consistent
point-in-time
copy
across
multiple
LUNs
or
volumes,
and
even
across
multiple
DS8000
systems.
This
function
is
available
through
the
use
of
command-line
interface
commands.
Inband
commands
over
remote
mirror
link
In
a
remote
mirror
environment,
inband
commands
are
issued
to
a
source
volume
of
a
remote
mirror
and
copy
volume
pair
on
a
local
storage
unit
and
sent
across
paths
(acting
as
a
conduit)
to
a
remote
storage
unit
to
enable
a
FlashCopy
pair
to
be
established
at
the
remote
site.
This
eliminates
the
need
for
a
network
connection
to
the
remote
site
solely
for
the
management
of
FlashCopy.
This
function
is
available
through
the
use
of
command-line
interface
commands.
Disaster
recovery
using
Copy
Services
One
of
the
main
reasons
for
using
Copy
Services
functions
is
in
preparation
for
a
possible
disaster
by
backing
up,
copying,
and
mirroring
your
data
at
the
production
and
recovery
sites.
You
can
create
a
disaster
recovery
solution
using
any
of
the
following
functions.
These
functions
help
improve
a
disaster
recovery
process
by
allowing
a
much
shorter
recovery
time
with
little
or
no
data
loss.
Chapter
1.
Introduction
to
IBM
TotalStorage
DS8000
series
19
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