Setting
up
your
environment
to
use
Global
Mirror
Use
this
process
to
set
up
your
environment
to
use
Global
Mirror
for
disaster
recovery.
Global
Mirror
asynchronously
copies
data
from
a
host
to
a
recovery
site
and
maintains
data
on
a
storage
unit
at
the
recovery
site.
You
can
configure
a
Global
Mirror
environment
using
two
sites
and
three
volumes
on
two
or
more
storage
units.
Note:
The
storage
unit
at
the
local
site
is
designated
as
the
Global
Mirror
master
and
all
other
local
(or
production)
storage
units
are
designated
as
subordinate
storage
units.
The
master
sends
commands
to
its
subordinate
storage
units.
These
subordinates
work
together
to
create
a
consistency
group
and
to
communicate
the
FlashCopy
commands
to
the
recovery
(or
remote)
site.
All
status
is
relayed
back
to
the
Global
Mirror
master.
When
you
create
volume
pairs
using
Global
Copy,
data
on
the
volumes
is
not
time
consistent
and
generally
not
useful
for
the
recovery
site
unless
all
of
the
data
from
the
local
site
has
been
copied
up
to
a
specific
point
in
time.
To
be
useful
for
disaster
recovery,
the
target
volumes
must
periodically
be
made
consistent
and
a
copy
of
the
data
made.
The
following
procedures
describe
how
to
set
up
your
environment
to
use
Global
Mirror
and
create
a
consistent
backup
copy
of
your
data.
1.
Perform
the
initial
planning
for
the
use
of
Global
Mirror.
One
of
the
first
things
the
administrator
of
the
site
must
do
to
use
Global
Mirror
is
determine
the
elements
that
are
involved
in
the
Global
Mirror
process.
This
includes
the
following:
v
The
storage
units
that
will
participate
in
the
session:
–
The
storage
unit
that
will
be
the
Global
Mirror
master
storage
unit
Note:
If
you
are
using
only
one
storage
unit
in
your
Global
Mirror
session,
then
that
storage
unit
will
be
your
master
storage
unit.
–
Other
participating
storage
units
that
will
be
Global
Mirror
Subordinate
storage
units
v
The
LSSs
and
volumes
within
those
LSSs
that
are
going
to
participate
in
the
session:
–
Global
Copy
source
volumes
at
the
local
sites
–
Global
Copy
target
volumes
(FlashCopy
source
volumes)
at
the
recovery
sites
–
FlashCopy
target
volumes
at
the
recovery
sites
–
LSSs
to
be
used
to
connect
the
master
and
subordinate
storage
units
v
The
following
considerations
are
part
of
your
management
planning
for
this
session,
remembering
that
a
session
is
a
collection
of
volumes
that
are
managed
together
to
create
consistent
copies
of
data:
–
An
LSS
can
only
be
assigned
to
one
session.
–
A
Global
Mirror
master
storage
unit
coordinates
the
consistency
group
that
is
identified
by
a
single
session
ID.
–
You
are
responsible
for
correctly
defining
sessions
and
managing
the
volumes
within
that
session.
–
A
maximum
of
eight
storage
units
are
allowed
per
session.
v
Data
paths
between
Global
Copy
pairs
v
Global
Mirror
control
paths
between
the
master
and
subordinate
storage
units
Chapter
10.
Disaster
recovery
using
Copy
Services
147
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