You
can
reverse
a
FlashCopy
relationship
that
has
change
recording
enabled
and
restore
the
tracks
from
the
target
volume
to
the
source
volume.
However,
the
background
copy
process
of
the
original
FlashCopy
must
complete
before
you
can
reverse
the
order
of
the
FlashCopy
relationship
to
its
original
source
and
target
relationship.
With
the
fast
reverse
restore
feature,
you
can
reverse
a
FlashCopy
relationship
that
has
change
recording
enabled
without
waiting
for
the
background
copy
of
the
original
FlashCopy
to
complete.
It
is
not
required
that
you
use
the
fast
reverse
restore
feature
during
disaster
recovery
operations;
however,
the
time
to
recover
could
be
significantly
longer
if
you
do
not.
Recovering
from
a
disaster
using
the
fast
reverse
process
Use
this
process
for
the
Global
Mirror
fast
reverse
restore
feature,
which
allows
a
FlashCopy
relationship
to
be
reversed
without
waiting
for
the
background
copy
of
the
original
FlashCopy
to
complete.
You
can
use
the
fast
reverse
restore
feature
of
FlashCopy
to
speed
up
the
recovery
process.
Using
the
DS
Storage
Manager,
you
make
the
following
selections:
1.
Create
a
FlashCopy
target
on
the
existing
Metro
Mirror
source
by
choosing
the
FlashCopy
target
and
a
source
Metro
Mirror
.
2.
Select
the
Fast
Reverse
restore
option.
FlashCopy
copies
the
partial
data
that
had
been
copied
to
Volume
C
before
the
disaster
occurred
to
Volume
B.
This
creates
a
consistent
copy
on
Volume
B.
Processing
also
provides
a
background
copy
of
the
consistent
group
for
Volume
B.
Note:
When
you
initiate
the
fast
reverse
restore
process,
Volume
C
becomes
unusable.
Recovering
from
a
disaster
without
the
fast
reverse
process
Use
this
procedure
in
place
of
the
fast
reverse
process.
The
fast
reverse
process
allows
a
FlashCopy
relationship
to
be
reversed
without
waiting
for
the
background
copy
of
the
original
FlashCopy
to
complete.
It
is
not
necessary
to
use
the
fast
reverse
feature
of
FlashCopy
for
your
recovery.
However,
the
wait
for
recovery
is
significantly
longer
if
you
do
not.
1.
Initiate
a
background
copy
on
the
Volume
B
to
Volume
C
FlashCopy
relationship.
2.
Wait
for
the
background
copy
to
complete.
Observe
the
out-of-sync
tracks.
3.
Select
the
Reverse
relationship
and
Initiate
background
copy
options
on
the
Volume
B
to
Volume
C
FlashCopy
relationship.
This
reverses
the
FlashCopy
relationship
such
that
Volume
C
is
the
source
and
Volume
B
is
the
target.
152
DS8000
User’s
Guide
Summary of Contents for TotalStorage DS8000
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