FlashCopy
is
an
optional
function.
To
use
it,
you
must
purchase
one
of
the
point-in-time
2244/239x
function
authorization
features.
The
FlashCopy
function
creates
a
copy
of
a
source
volume
on
the
target
volume.
This
copy
is
called
a
point-in-time
copy.
When
you
initiate
a
FlashCopy
operation,
a
FlashCopy
relationship
is
created
between
a
source
volume
and
target
volume.
A
FlashCopy
relationship
is
a
mapping
of
the
FlashCopy
source
volume
and
a
FlashCopy
target
volume.
This
mapping
allows
a
point-in-time
copy
of
that
source
volume
to
be
copied
to
the
associated
target
volume.
The
FlashCopy
relationship
exists
between
this
volume
pair
from
the
time
that
you
initiate
a
FlashCopy
operation
until
the
storage
unit
copies
all
data
from
the
source
volume
to
the
target
volume
or
you
delete
the
FlashCopy
relationship,
if
it
is
a
persistent
FlashCopy.
One
of
the
main
benefits
of
the
FlashCopy
function
is
that
the
point-in-time
copy
is
immediately
available
for
creating
a
backup
of
production
data.
The
target
volume
is
available
for
read
and
write
processing
so
it
can
be
used
for
testing
or
backup
purposes.
Data
is
physically
copied
from
the
source
volume
to
the
target
volume
using
a
background
process.
(A
FlashCopy
operation
without
a
background
copy
is
also
possible,
which
allows
only
data
that
is
modified
on
the
source
to
be
copied
to
the
target
volume.)
The
amount
of
time
that
it
takes
to
complete
the
background
copy
depends
on
the
following
criteria:
v
The
amount
of
data
being
copied
v
The
number
of
background
copy
processes
that
are
occurring
v
The
other
activities
that
are
occurring
on
the
storage
units
The
FlashCopy
function
supports
the
following
copy
options:
Consistency
groups
Creates
a
consistent
point-in-time
copy
of
multiple
volumes,
with
negligible
host
impact.
You
can
enable
FlashCopy
consistency
groups
from
the
DS
CLI.
Change
recording
Activates
the
change
recording
function
on
the
volume
pair
that
is
participating
in
a
FlashCopy
relationship.
This
enables
a
subsequent
refresh
to
the
target
volume.
Establish
FlashCopy
on
existing
Metro
Mirror
source
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.
Fast
reverse
Reverses
the
FlashCopy
relationship
without
waiting
for
the
finish
of
the
background
copy
of
the
previous
FlashCopy.
This
option
applies
to
the
Global
Mirror
mode.
Inhibit
writes
to
target
Ensures
that
write
operations
are
inhibited
on
the
target
volume
until
a
refresh
FlashCopy
operation
is
complete.
Multiple
Relationship
FlashCopy
Allows
a
source
volume
to
have
multiple
(up
to
12)
target
volumes
at
the
same
time.
Chapter
1.
Introduction
to
IBM
System
Storage
DS8000
series
25
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