Table
4.
Failover
and
failback
implementation
(continued)
Step
Operation
Manage-
ment
required
to
Format
of
source
volume
and
target
volume
Format
of
source
and
target
volume
pair
Result:
Site
A
Result:
Site
B
Disaster
at
Site
A
Failover
Site
B
Volume
B,
Volume
A
Volume
B1
:
Volume
A1
Volume
A1
->
Volume
B1
(Suspended)
The
volume
pair
might
display
as
full
or
pending
duplex
state
if
host
write
operations
have
stopped.
Volume
B1
->
Volume
A1
(Suspended)
2
(Site
A
volumes
must
be
in
suspended
state)
Return
production
to
Site
A
Failback
Site
A
Volume
A,
Volume
B
Volume
A1
:
Volume
B1
Volume
A1
->
Volume
B1
Volume
A1
->
Volume
B1
3a
(Site
B
volumes
should
be
in
a
suspended
state)
Return
to
production
(Site
B)
Note:
If
Site
A
is
still
not
opera-
tional;
production
can
continue
at
Site
B.
Failback
Site
B
Volume
B,
Volume
A
Volume
B1
:
Volume
A1
Volume
B1
->
Volume
A1
Volume
B1
->
Volume
A1
3b
(prepare
to
return
to
production
(Site
A)
from
production
(Site
B)
Failover
Site
A
Volume
A,
Volume
B
Volume
A1:
Volume
B1
Volume
A1
->
Volume
B1
Volume
B1
->
Volume
A1
(Suspended
state;
the
volume
pair
might
display
full
or
pending
state
if
host
write
operations
have
stopped.)
3c
(Site
A
volumes
should
be
in
a
suspended
state)
Return
to
production
-
Site
A
Failback
Site
A
Volume
A,
Volume
B
Volume
A1:
Volume
B1
Volume
A1
->
Volume
B1
Volume
A1
->
Volume
B1
Using
Global
Mirror
for
disaster
recovery
Global
Mirror
is
a
long-distance,
two-site,
remote
copy
solution
that
uses
asynchronous
technology.
Global
Mirror
is
based
on
existing
Global
Copy
and
FlashCopy
functions.
The
following
tasks
are
illustrated:
v
Setting
up
your
environment
to
use
Global
Mirror
v
Using
Global
Mirror
for
a
planned
failover
v
Using
Global
Mirror
for
an
unplanned
failover
v
Using
recovery
procedures
with
and
without
the
fast
reverse
feature
146
DS8000
User’s
Guide
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