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Table
3.
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
operational;
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
Returning
production
to
local
site
after
planned
outages
After
restoring
operations
at
Site
B,
you
can
schedule
a
failback
operation
to
synchronize
data
and
to
enable
production
to
resume
at
your
original
site,
Site
A.
Before
you
run
a
failback
operation,
you
must
create
paths
from
Site
B
to
Site
A
between
the
specific
LSSs.
For
this
scenario,
assume
that
Site
A
is
operational
and
that
connectivity
from
Site
B
to
Site
A
is
available.
Use
this
procedure
to
restart
your
production
environment
Chapter
10.
Disaster
recovery
using
Copy
Services
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Содержание TotalStorage DS8000
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