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208 Chapter 4 Performing CCI Operations
4.7.5 Recovery from SVOL-SSUS-Takeover
After recovery of the ESCON/FC link, this special state (PVOL_PSUE and SVOL_PSUS) will be
changed to COPY state that original SVOL is swapped as the NEW_PVOL and resynchronizes
(cast off original PVOL) the NEW_SVOL based on the NEW_PVOL by issuing of the
pairresync -swaps command on takeover site (Host B).
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 -swaps
on Host B only
S-VOL P-VOL
Host C
Host A
Host B
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
S-VOL P-VOL
If the pairresync -swaps command has been failed at the ESCON/FC link is not restored, then
this special state (PVOL_PSUE and SVOL_PSUS) is NOT changed.
Failback after recovery on Host B. After recovery with execution of the pairresync -swaps
command on Host B, if you stop the applications on Host B and restart the applications on
Host A, then horctakeover will execute Swap-Takeover, even though Host A cannot
communicate with remote Host B.
Host C
Host A
Host B
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
horctakeover
on HostA
S-VOL P-VOL
Host C
Host A
Host B
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
P-VOL S-VOL