1.
FlashCopy
from
Volume
A
to
Volume
B
2.
FlashCopy
from
Volume
A
to
Volume
C
3.
FlashCopy
from
Volume
A
to
Volume
D
This
FlashCopy
procedure
presents
a
possible
exposure
for
mistakes.
For
instance,
if
the
FlashCopy
operation
(step
2
of
the
FlashCopy
procedure)
is
mistakenly
performed
from
Volume
A
to
Volume
B
rather
than
from
Volume
A
to
Volume
C,
the
result
could
be
data
that
overwrites
the
original
point-in-time
copy
in
volume
B.
The
use
of
the
persistent
FlashCopy
function
requires
that
the
FlashCopy
relationship
is
explicitly
withdrawn
before
another
FlashCopy
operation
can
be
performed.
While
this
restriction
does
not
guarantee
that
a
point-in-time
copy
cannot
be
overwritten
by
mistake,
it
does
provide
an
extra
measure
of
security.
Note:
Persistent
FlashCopy
is
always
required
for
refreshing
a
FlashCopy
target
volume.
Re-synchronizing
FlashCopy
volume
pairs
Re-synchronizing
FlashCopy
volumes
provides
the
ability
to
update
an
initial
point-in-time
copy
of
a
source
volume.
You
can
resync
your
FlashCopy
volumes
without
having
to
recopy
your
entire
volume.
This
process
is
only
possible
with
a
persistent
relationship,
whereby
the
storage
unit
continually
tracks
updates
to
the
source
and
target
volumes.
With
persistent
relationships,
the
relationship
between
the
source
and
target
volumes
is
maintained
after
the
background
copy
has
completed.
This
function
reduces
the
background
copy
completion
time
because
only
a
subset
of
data
is
copied
when
either
the
source
or
target
volume
has
changed.
The
target
volume
becomes
current
with
the
newly
established
point-in-time
source
copy.
To
enable
this
function
of
FlashCopy,
the
storage
unit
uses
a
feature
called
change
recording
to
monitor
write
operations
and
record
changes
that
were
made
to
volumes
participating
in
FlashCopy
relationships
since
the
initial
(or
last)
incremental
FlashCopy
was
performed.
After
the
initial
copy
of
the
source
volume
to
the
target
volume,
the
FlashCopy
relationship
between
the
volumes
is
not
automatically
deleted.
Rather,
it
remains
to
allow
the
volumes
to
be
re-synchronized.
The
next
time
that
you
want
to
update
the
information
on
your
target
volume,
you
can
resync
your
target
volume
again.
Note:
If
you
perform
a
resync
operation,
it
is
sent
to
any
source
and
volume
pair.
All
source
and
target
volume
pairs
will
be
re-synchronized,
not
just
the
one
pair
that
you
selected.
Creating
a
Remote
FlashCopy
operation
(Inband
FlashCopy
on
the
ESS
2105)
Remote
FlashCopy
operations
(Inband
FlashCopy
on
the
ESS
2105)
allow
you
to
create
a
FlashCopy
relationship
at
a
target
(remote)
site
using
remote
FlashCopy
commands,
without
having
an
network
connection
to
the
target
site.
Remote
FlashCopy
commands
are
issued
to
a
source
volume
of
a
remote
mirror
and
copy
volume
pair
on
a
source
(local)
storage
unit
and
sent
across
paths
(acting
114
DS8000
User’s
Guide
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