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Chapter
10.
Disaster
recovery
using
Copy
Services
One
of
the
main
reasons
for
using
Copy
Services
functions
is
in
preparation
for
a
possible
disaster
by
backing
up,
copying,
and
mirroring
your
data
at
the
production
and
recovery
sites.
You
can
create
a
disaster
recovery
solution
using
any
of
the
following
functions.
These
functions
help
improve
a
disaster
recovery
process
by
allowing
a
much
shorter
recovery
time
with
little
or
no
data
loss.
Note:
In
a
remote
mirror
and
copy
environment,
when
two
storage
units
are
set
up
in
two
geographically
distinct
locations,
we
refer
to
the
sites
as
Site
A
(the
production
site)
and
Site
B
(the
recovery
site).
Failover
and
failback
operations
A
failover
is
the
process
of
temporarily
switching
production
to
a
backup
facility
(normally
your
recovery
site)
following
a
planned
outage,
such
as
a
scheduled
maintenance
period
or
an
unplanned
outage,
such
as
a
disaster.
A
failback
operation
is
the
process
of
returning
production
to
its
original
location.
These
operations
use
remote
mirror
and
copy
functions
to
help
reduce
the
time
that
is
required
to
synchronize
volumes
after
sites
are
switched
during
planned
or
unplanned
outages.
Global
Mirror
The
Global
Mirror
function
provides
a
two-site
extended
distance
remote
copy
option
for
disaster
recovery
and
backup
solution
for
the
zSeries
and
open
systems
environments.
This
solution
is
based
on
existing
Global
Copy
and
FlashCopy
functions.
With
Global
Mirror,
the
data
that
the
host
writes
to
the
storage
unit
at
the
production
site
is
asynchronously
shadowed
to
the
storage
unit
at
the
recovery
site.
Global
Mirror
operates
over
high-speed,
Fibre
Channel
communication
links
and
is
designed
to
maintain
a
consistent
and
restartable
copy
of
data
at
a
recovery
site
that
can
be
located
at
virtually
unlimited
distance
from
the
production
site.
Performing
failover
and
subsequent
failback
operations
In
the
event
of
a
planned
outage,
such
as
a
scheduled
maintenance
or
an
unplanned
outage,
such
as
a
hardware
failure
that
disables
the
operation
of
your
production
site,
you
can
failover
to
your
recovery
site
to
continue
operations.
After
your
production
site
is
operational,
you
can
perform
a
subsequent
failback
operation
to
move
production
back
to
its
original
location.
Moving
production
to
Site
B
after
planned
outages
(failover)
When
you
schedule
a
planned
outage
at
your
production
site
(Site
A),
you
can
switch
production
to
your
recovery
site
(Site
B),
allowing
the
processing
of
data
to
resume
at
Site
B.
This
process
is
known
as
a
failover
recovery.
The
storage
units
at
both
Site
A
and
Site
B
must
be
functional
and
reachable.
In
a
disaster
recovery
environment,
when
two
storage
units
are
set
up
in
two
geographically
distinct
locations,
we
refer
to
the
storage
unit
at
the
production
or
local
site
as
Site
A
and
the
storage
unit
at
the
remote
or
recovery
site
as
Site
B.
For
this
scenario,
assume
that
all
I/O
to
Site
A
has
ceased
because
of
a
planned
outage,
such
as
a
scheduled
maintenance.
The
failover
operation
is
issued
to
the
©
Copyright
IBM
Corp.
2004,
2005
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