Filter
Top Products
Chapter 2 Data Replication
12
2
2
2
.
.
.
3
3
3
R
R
R
e
e
e
p
p
p
l
l
l
i
i
i
c
c
c
a
a
a
t
t
t
i
i
i
o
o
o
n
n
n
O
O
O
p
p
p
e
e
e
r
r
r
a
a
a
t
t
t
i
i
i
o
o
o
n
n
n
s
s
s
a
a
a
n
n
n
d
d
d
S
S
S
t
t
t
a
a
a
t
t
t
e
e
e
T
T
T
r
r
r
a
a
a
n
n
n
s
s
s
i
i
i
t
t
t
i
i
i
o
o
o
n
n
n
s
s
s
This section describes the replication operations and state transitions.
Figure 2-2 Replication Operations and State Transitions
The pair setting is specified
but MV and RV are separated.
sep/exec
Difference between MV and
RV is being reflected.
The pair setting is specified
and synchronization has been
established.
exec : Executing Replicate, Separate, or Restore
sync : Replicate or Restore synchronization state
rpl : replicate (Replicate)
rpl/exec ............. Executing synchronization
rpl/sync ............. Synchronization state
sep : separate (Separate)
sep/exec ............ Executing Separate
separated .......... Separate completion state
rst : restore (Restore)
rst/exec ............. Executing Restore
rst/sync ............. Synchronization state
•
When Restore(update) is
executed, updates to MV are
reflected to RV.
• When Restore(protect) is
executed, updates to MV are not
reflected to RV.
• As a rule, access to RV is not
allowed.
MV
RV
rpl/exec
MV RV
separated
sync
rst/exec
• MV and RV can be
updated.
Replicate
• RV cannot be updated.
Restore
• RV cannot be updated.
Separate
• As a rule, RV cannot
be updated.
•
When Restore(protect) is executed,
Synchronous State (rst/sync) is
placed and then automatically
changed to Separated State
(separated).
MV RV
rpl/sync
rst/sync
•
Updates to MV are reflected to RV.
• As a rule, access to RV is not
allowed.
MV
RV