![background image](http://html1.mh-extra.com/html/ibm/totalstorage-ds8000/totalstorage-ds8000_user-manual_4109708044.webp)
remote
location
for
disaster
recovery.
It
protects
data
consistency
across
all
volumes
that
you
have
defined
for
mirroring.
The
volumes
can
reside
on
several
different
storage
units.
The
z/OS
Global
Mirror
function
can
mirror
the
volumes
over
several
thousand
kilometers
from
the
source
site
to
the
target
recovery
site.
DS8000
storage
complexes
support
z/OS
Global
Mirror
only
on
zSeries
hosts.
With
z/OS
Global
Mirror,
you
can
suspend
or
resume
service
during
an
outage.
You
do
not
have
to
end
your
current
data-copy
session.
You
can
suspend
the
session,
then
restart
it.
Only
data
that
changed
during
the
outage
needs
to
be
resynchronized
between
the
copies.
The
z/OS
Global
Mirror
function
is
an
optional
function.
To
use
it,
you
must
purchase
the
remote
mirror
for
z/OS
2244
function
authorization
model,
which
is
2244
Model
RMZ.
z/OS
Metro/Global
Mirror
(3-site
z/OS
Global
Mirror
and
Metro
Mirror)
This
mirroring
capability
uses
z/OS
Global
Mirror
to
mirror
primary
site
data
to
a
location
that
is
a
long
distance
away
and
also
uses
Metro
Mirror
to
mirror
primary
site
data
to
a
location
within
the
metropolitan
area.
This
enables
a
z/OS
3-site
high
availability
and
disaster
recovery
solution
for
even
greater
protection
from
unplanned
outages.
The
z/OS
Metro/Global
Mirror
function
is
an
optional
function.
To
use
it,
you
must
purchase
both
of
the
following
functions:
v
Remote
mirror
for
z/OS
(2244
Model
RMZ)
v
Remote
mirror
and
copy
function
(2244
Model
RMC)
for
both
the
primary
and
secondary
storage
units
FlashCopy
The
IBM
TotalStorage
FlashCopy
feature
provides
a
point-in-time
copy
capability
for
logical
volumes.
FlashCopy
creates
a
physical
point-in-time
copy
of
the
data,
with
minimal
interruption
to
applications,
and
makes
it
possible
to
access
immediately
both
the
source
and
target
copies.
The
primary
objective
of
FlashCopy
is
to
create
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
the
source
volume
and
target
volume.
A
FlashCopy
relationship
is
a
″
mapping
″
of
a
FlashCopy
source
volume
and
a
FlashCopy
target
volume.
This
mapping
allows
a
point-in-time
copy
of
the
source
volume
to
be
copied
to
the
target
volume.
The
FlashCopy
relationship
exists
between
the
volume
pair
from
the
time
that
you
initiate
a
FlashCopy
operation
until
the
DS8000
copies
all
data
from
the
source
volume
to
the
target
volume
or
until
you
delete
the
FlashCopy
relationship,
if
it
is
a
persistent
FlashCopy.
The
point-in-time
copy
that
is
created
by
FlashCopy
is
typically
used
when
you
need
a
copy
of
the
production
data
to
be
produced
with
minimal
application
downtime.
It
can
be
used
for
online
back
up,
testing
of
new
applications,
or
for
creating
a
database
for
data-mining
purposes.
The
copy
looks
exactly
like
the
original
source
volume
and
is
an
instantly
available,
binary
copy.
FlashCopy
supports
the
following
copy
options:
Data
Set
FlashCopy
Data
Set
FlashCopy
allows
a
FlashCopy
of
a
data
set
in
a
zSeries
environment.
18
DS8000
User’s
Guide
Содержание TotalStorage DS8000
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