Remote
mirror
and
copy
is
an
optional
function.
To
use
it,
you
must
purchase
the
remote
mirror
and
copy
2244
function
authorization
model,
which
is
2244
Model
RMC.
DS8000
storage
units
can
participate
in
remote
mirror
and
copy
solutions
with
the
ESS
Model
750,
ESS
Model
800,
and
DS6000
storage
units.
The
remote
mirror
and
copy
feature
can
operate
in
the
following
modes:
Metro
Mirror
Provides
real-time
mirroring
of
logical
volumes
between
two
DS8000s
that
can
be
located
up
to
300
km
from
each
other.
It
is
a
synchronous
copy
solution
where
write
operations
are
completed
on
both
copies
(local
and
remote
site)
before
they
are
considered
to
be
completed.
Global
Copy
Copies
data
nonsynchronously
and
over
longer
distances
than
is
possible
with
Metro
Mirror.
When
operating
in
Global
Copy
mode,
the
source
volume
sends
a
periodic,
incremental
copy
of
updated
tracks
to
the
target
volume
instead
of
a
constant
stream
of
updates.
This
causes
less
impact
to
application
writes
for
source
volumes
and
less
demand
for
bandwidth
resources,
while
allowing
a
more
flexible
use
of
the
available
bandwidth.
Global
Mirror
Provides
a
long-distance
remote
copy
feature
across
two
sites
using
asynchronous
technology.
Global
Mirror
operations
provide
the
following
benefits:
v
Support
for
virtually
unlimited
distance
between
the
local
and
remote
sites,
with
the
distance
typically
limited
only
by
the
capabilities
of
the
network
and
the
channel
extension
technology.
This
″
unlimited
″
distance
enables
you
to
choose
your
remote
site
location
based
on
business
needs
and
enables
site
separation
to
add
protection
from
localized
disasters.
v
A
consistent
and
restartable
copy
of
the
data
at
the
remote
site,
created
with
minimal
impact
to
applications
at
the
local
site.
v
Data
currency
where,
for
many
environments,
the
remote
site
lags
behind
the
local
site
on
an
average
of
3
to
5
seconds,
minimizing
the
amount
of
data
exposure
in
the
event
of
an
unplanned
outage.
The
actual
lag
in
data
currency
that
you
experience
can
depend
upon
a
number
of
factors,
including
specific
workload
characteristics
and
bandwidth
between
the
local
and
remote
sites.
v
Dynamic
selection
of
the
desired
recovery
point
objective,
based
upon
business
requirements
and
optimization
of
available
bandwidth.
v
Session
support
whereby
data
consistency
at
the
remote
site
is
internally
managed
across
up
to
eight
DS8000
machines
that
are
located
across
the
local
and
remote
sites.
v
Efficient
synchronization
of
the
local
and
remote
sites
with
support
for
failover
and
failback
modes,
helping
to
reduce
the
time
that
is
required
to
switch
back
to
the
local
site
after
a
planned
or
unplanned
outage.
z/OS
Global
Mirror
The
z/OS
Global
Mirror
function
mirrors
data
on
the
storage
unit
to
a
Chapter
1.
Introduction
to
IBM
TotalStorage
DS8000
series
17
Содержание TotalStorage DS8000
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