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186 Chapter 4 Performing CCI Operations
P-VOL S-VOL
Write Data
R or R/W
R/W
NEW_
SVOL
NEW_
PVOL
R/W
R
pairresync -swaps on SVOL
or
pairresync -swapp on PVOL
T0
T1
Figure 4.9 Swap Operation
L2
0
L1
1
0
2
SSWS
L
PVOL
SVOL
SL
SMPL
G1 (Sync)
G2(UR)
DC2
DC1
L3
DC3
2
1
PVOL
SMPL
APP1
L2
0
L1
1
0
2
SVOL
PVOL
PVOL
SMPL
G1
(
S
y
nc
)
G2
(
UR
)
DC2
DC1
L3
DC3
2
1
SVOL
S
MPL
pairresync –g G1 –FHORC 1 -
APP1
pairresync –g G1 -swapp
After DC1 recovery, Failback from DC3
Figure 4.10 Example swaps option with -FHORC [MU#]