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Hitachi Command Control Interface (CCI) User and Reference Guide 209
Failback without recovery on Host B. After recovery of the ESCON/FC link and hosts, if you
stopped the applications without executing the pairresync -swaps command on Host B and
restarted the applications on Host A, you must use the following procedure for recovery. At
this time, pairvolchk command on Host A will be returned PVOL_PSUE & SVOL_PSUS as
state combination.
Delta COPY
Æ
PAIR
P-VOL
Host C
Host A
Host B
PAIR
PSUE
PAIR
PAIR
PAIR
SSUS
SSUS
SSUS
SSUS
SSUS
S-VOL
Host C
Host A
Host B
COPY
COPY
COPY
COPY
COPY
COPY
COPY
COPY
COPY
COPY
pairresync
-swapp
on Host A
S-VOL P-VOL
Host C
Host A
Host B
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
S-VOL P-VOL
After PAIR
horctakeover
Host C
Host A Host B
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
P-VOL S-VOL
Note: The pairresync -swapp option is used to be swapped volume from the PVOL to SVOL at
suspending state on the PVOL side and resynchronizes (cast off original PVOL) the
NEW_SVOL based on the NEW_PVOL. At the result of this operation, the volume attributes of
own host (local host) becomes for the NEW_SVOL. The target volume of the local host must
have the P-VOL, and needs to the remote host for this operation.